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<!DOCTYPE html>
<html lang="en" data-theme="dark">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Markdown Preview: Read, Render & Export Markdown | Secutils.dev</title>
<meta name="description" content="Free reading-first Markdown previewer. Renders GFM, Mermaid diagrams, KaTeX math, GitHub alerts, and ==highlights== with find-in-page, source editing, and self-contained HTML/PDF export. Browser-only, no signup.">
<meta name="robots" content="index, follow, max-image-preview:large">
<link rel="canonical" href="https://{{TOOLS_HOST}}/md">
<meta name="su-tool-path" content="/md">
<meta name="su-tool-name" content="Markdown Preview">
<meta name="su-tool-description" content="Reading-first Markdown previewer with Mermaid, KaTeX math, GitHub alerts, find-in-page, and self-contained HTML/PDF export. Shareable URL state, no signup.">
<meta name="su-tool-promote" content="true">
<meta property="og:type" content="website">
<meta property="og:site_name" content="Secutils.dev">
<meta property="og:title" content="Markdown Preview: Read, Render & Export Markdown">
<meta property="og:description" content="Free reading-first Markdown previewer. Mermaid, KaTeX math, GitHub alerts, find-in-page, source editing, self-contained HTML/PDF export. Browser-only.">
<meta property="og:url" content="https://{{TOOLS_HOST}}/md">
<meta property="og:image" content="https://secutils.dev/docs/img/og/og-md.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="Markdown Preview on Secutils.dev: render, read, and export Markdown.">
<meta property="og:locale" content="en_US">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Markdown Preview: Read, Render & Export Markdown">
<meta name="twitter:description" content="Free reading-first Markdown previewer. Mermaid, KaTeX math, GitHub alerts, find-in-page, HTML/PDF export. No signup.">
<meta name="twitter:image" content="https://secutils.dev/docs/img/og/og-md.png">
<script type="application/ld+json">{"@context":"https://schema.org","@type":"WebApplication","name":"Markdown Preview","url":"https://{{TOOLS_HOST}}/md","applicationCategory":"DeveloperApplication","operatingSystem":"Any","browserRequirements":"Requires JavaScript","isAccessibleForFree":true,"offers":{"@type":"Offer","price":"0","priceCurrency":"USD"},"publisher":{"@type":"Organization","name":"Secutils.dev","url":"https://secutils.dev"},"sameAs":"https://github.com/secutils-dev/secutils/blob/main/dev/tools/md.html","description":"Free reading-first Markdown previewer with live rendering, Mermaid diagrams, KaTeX math, GitHub alerts, find-in-page, source editing, and self-contained HTML or print-ready PDF export. Browser-only, no signup."}</script>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@300..700&family=Roboto+Mono:wght@400..700&display=swap" rel="stylesheet">
<!-- Privacy-friendly analytics by Plausible -->
<script defer src="https://tools.secutils.dev/js/script.js" fetchpriority="low"></script>
<script>
window.plausible = window.plausible || function () { (plausible.q = plausible.q || []).push(arguments) };
plausible.init = plausible.init || function (i) { plausible.o = i || {} };
plausible.init();
</script>
<script>
// Show the loading state from the first paint when the page will hydrate
// from a fragment or ?url= (avoids a flash of the empty "start" panel
// while marked/highlight load and the fragment decompresses).
if (location.hash.length > 1 || /[?&]url=/.test(location.search)) {
document.documentElement.classList.add('su-loading');
}
</script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/github.min.css">
<style>
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root, [data-theme="dark"] {
--bg: #141519; --surface: #1d1e24; --surface-hover: #2c2d33;
--border: #343741; --text: #dfe5ef; --text-muted: #98a2b3;
--primary: #fed047; --primary-hover: #fdc615;
--primary-text: #642340;
--primary-glow: rgba(254,208,71,0.10);
--accent: #642340;
--badge-bg: #2B394F; --badge-text: #98A8C3;
--radius: 12px;
--font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
--mono: 'Roboto Mono', 'SF Mono', 'Fira Code', Consolas, monospace;
--code-bg: #16171c;
--bq-bg: #1c1d22; --bq-border: #fed047; --bq-text: #c9b870;
--hl-bg: #b9942b; --hl-text: #1d1e24;
}
[data-theme="light"] {
--bg: #f5f7fa; --surface: #ffffff; --surface-hover: #f1f3f5;
--border: #d3dae6; --text: #343741; --text-muted: #69707d;
--primary: #fed047; --primary-hover: #fdc615;
--primary-text: #642340;
--primary-glow: rgba(254,208,71,0.15);
--accent: #642340;
--badge-bg: #E3E8F2; --badge-text: #505F79;
--code-bg: #f6f8fa;
--bq-bg: #fef9e7; --bq-border: #642340; --bq-text: #4a3a2a;
--hl-bg: #fff3a3; --hl-text: #3b2f00;
}
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; display: flex; flex-direction: column; transition: background .25s, color .25s; }
header { display: flex; align-items: center; justify-content: space-between; padding: 0 16px; height: 48px; background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; transition: background .25s, border-color .25s; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-svg { flex-shrink: 0; }
.logo-svg .logo-text-fill { fill: var(--text); }
.logo-badge { display: inline-flex; align-items: center; padding: 4px 16px; border-radius: 4px; border: none; background: var(--badge-bg); color: var(--badge-text); font-size: 12px; font-weight: 450; line-height: 16px; white-space: nowrap; }
.header-right { display: flex; gap: 8px; align-items: center; }
/* `height` pins the outer size so `.btn-primary`'s bold weight doesn't render
1-2 px taller than the regular variant. See dev/tools/AGENTS.md -> "Buttons". */
.btn { padding: 7px 14px; height: 29px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font: 13px/1 var(--font); cursor: pointer; transition: all .15s; display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; }
.btn:hover:not(:disabled) { background: var(--surface-hover); border-color: var(--text-muted); }
.btn:disabled { opacity: 0.55; cursor: default; }
.btn-primary { background: var(--primary); border-color: var(--primary-text); color: var(--primary-text); font-weight: 500; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-sm { padding: 5px 10px; height: 24px; font-size: 12px; }
.btn.active { background: var(--surface-hover); border-color: var(--text-muted); color: var(--text); }
.theme-toggle { width: 36px; height: 36px; padding: 0; display: flex; align-items: center; justify-content: center; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); color: var(--text-muted); cursor: pointer; transition: all .2s; }
.theme-toggle:hover { background: var(--surface-hover); color: var(--text); }
.theme-toggle svg { width: 16px; height: 16px; fill: currentColor; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
.skill-link { height: 36px; display: inline-flex; align-items: center; gap: 6px; padding: 0 12px; border: 1px solid var(--border); border-radius: 18px; background: var(--surface); color: var(--text-muted); font: 12px var(--font, system-ui), sans-serif; text-decoration: none; transition: all .15s; cursor: pointer; }
.skill-link:hover { color: var(--text); border-color: var(--text-muted); background: var(--surface-hover); }
.skill-link svg { width: 14px; height: 14px; fill: none; stroke: currentColor; }
.su-more-tools { margin: 8px 0 0; padding: 12px 18px; text-align: center; border: 1px solid rgba(254, 208, 71, 0.35); border-radius: 12px; background: rgba(254, 208, 71, 0.06); font: 13px/1.55 var(--font); color: var(--text); transition: border-color .25s, background-color .25s, color .25s; }
.su-more-tools p { margin: 0; }
.su-more-tools a { color: var(--primary); font-weight: 700; text-decoration: none; white-space: nowrap; }
.su-more-tools a:hover { color: var(--primary-hover); text-decoration: underline; }
@media (max-width: 600px) { .su-more-tools { padding: 12px 14px; } .su-more-tools a { white-space: normal; } }
.su-noscript { max-width: 720px; margin: 24px auto; padding: 16px; border: 1px solid var(--border); border-radius: 8px; font: 14px/1.5 var(--font, system-ui), sans-serif; background: var(--surface); color: var(--text); }
/* Reading-first layout */
main { flex: 1; padding: 16px; display: flex; flex-direction: column; overflow: hidden; }
.toolbar { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding-bottom: 12px; flex-wrap: wrap; }
.toolbar-left { display: flex; align-items: center; gap: 10px; min-width: 0; }
.doc-title { font-size: 13px; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 40vw; }
.toolbar-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.stats-text { font: 11px var(--mono); color: var(--text-muted); white-space: nowrap; }
/* Icon-only utility button */
.icon-btn { padding: 4px; border: none; background: none; color: var(--text-muted); cursor: pointer; border-radius: 4px; transition: all .15s; display: inline-flex; align-items: center; justify-content: center; }
.icon-btn:hover { color: var(--text); background: var(--surface-hover); }
.icon-btn svg { width: 16px; height: 16px; }
#previewPane { flex: 1; min-height: 0; display: flex; flex-direction: column; position: relative; }
#previewPane:fullscreen { background: var(--bg); padding: 16px; }
.output-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); display: flex; flex-direction: column; overflow: hidden; flex: 1; min-height: 0; transition: background .25s, border-color .25s; }
.output-scroll { flex: 1; overflow-y: auto; padding: 32px; }
.output-panel.dragover { border-color: var(--primary); background: var(--primary-glow); }
/* Segmented view switch (Preview / HTML / Source) */
.view-switch { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; height: 24px; }
.view-btn { appearance: none; border: none; border-right: 1px solid var(--border); background: var(--surface); color: var(--text-muted); font: 12px/1 var(--font); padding: 0 11px; height: 100%; cursor: pointer; transition: background .15s, color .15s; }
.view-btn:last-child { border-right: none; }
.view-btn:hover:not(:disabled):not(.active) { background: var(--surface-hover); color: var(--text); }
.view-btn.active { background: var(--primary); color: var(--primary-text); font-weight: 500; }
.view-btn:disabled { opacity: .5; cursor: default; }
/* Source editor + HTML preview (hidden until their view is active) */
#editorMount { flex: 1; min-height: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); display: none; transition: border-color .15s, background .25s; }
#editorMount.dragover { border-color: var(--primary); background: var(--primary-glow); }
#htmlPreview { flex: 1; min-height: 0; width: 100%; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; display: none; }
body.su-view-edit #previewWrap { display: none; }
body.su-view-edit #editorMount { display: block; }
body.su-view-html #previewWrap { display: none; }
body.su-view-html #htmlPreview { display: block; }
.cm-editor { height: 100%; font: 13px/1.6 var(--mono); }
.cm-editor.cm-focused { outline: none; }
.cm-scroller { font-family: var(--mono); }
.cm-content { padding: 8px 0; }
.cm-line { padding: 0 12px; }
.cm-gutters { background: var(--surface); border-right: 1px solid var(--border); color: var(--text-muted); }
.cm-activeLineGutter, .cm-activeLine { background: var(--surface-hover) !important; }
.cm-cursor { border-left-color: var(--primary) !important; }
.cm-selectionBackground, .cm-content ::selection { background: rgba(254, 208, 71, 0.18) !important; }
.cm-editor { color: var(--text); }
.tok-heading, .ͼ1 .tok-heading { color: #d2a8ff; font-weight: 600; }
[data-theme="light"] .tok-heading { color: #6f42c1; }
.tok-link { color: var(--primary); }
.tok-emphasis { font-style: italic; }
.tok-strong { font-weight: 700; color: var(--text); }
.tok-monospace { color: #ffa657; }
[data-theme="light"] .tok-monospace { color: #953800; }
.tok-list { color: var(--text-muted); }
.tok-quote { color: #c9b870; font-style: italic; }
[data-theme="light"] .tok-quote { color: #735c0f; }
.editor-fallback { width: 100%; height: 100%; padding: 14px; font: 13px/1.6 var(--mono); background: var(--surface); color: var(--text); border: none; outline: none; resize: none; }
/* Find-in-page bar */
.find-bar { position: absolute; top: 10px; right: 18px; z-index: 20; display: flex; align-items: center; gap: 4px; padding: 5px 6px 5px 10px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,0.3); }
.find-bar[hidden] { display: none; }
.find-bar input { width: 180px; max-width: 42vw; border: none; background: transparent; color: var(--text); font: 13px var(--font); outline: none; }
.find-count { font: 11px var(--mono); color: var(--text-muted); white-space: nowrap; min-width: 34px; text-align: center; }
.find-bar .icon-btn svg { width: 14px; height: 14px; }
/* Preview article */
.preview-article { width: 100%; max-width: 820px; margin: 0 auto; line-height: 1.7; font-size: 15px; color: var(--text); }
.preview-article h1, .preview-article h2, .preview-article h3, .preview-article h4, .preview-article h5, .preview-article h6 { color: var(--text); line-height: 1.3; margin-top: 1.4em; margin-bottom: .5em; position: relative; }
.preview-article h1:first-child, .preview-article h2:first-child, .preview-article h3:first-child { margin-top: 0; }
.preview-article h1 { font-size: 1.9em; border-bottom: 1px solid var(--border); padding-bottom: .3em; }
.preview-article h2 { font-size: 1.45em; border-bottom: 1px solid var(--border); padding-bottom: .25em; }
.preview-article h3 { font-size: 1.2em; }
.preview-article h4 { font-size: 1.05em; }
.preview-article p { margin: 0 0 14px; }
.preview-article a { color: var(--primary); text-decoration: none; }
.preview-article a:hover { text-decoration: underline; }
.preview-article .su-anchor { opacity: 0; margin-left: .35em; color: var(--text-muted); text-decoration: none; font-weight: 400; }
.preview-article :is(h1,h2,h3,h4,h5,h6):hover .su-anchor { opacity: 1; }
.preview-article img { max-width: 100%; border-radius: 8px; margin: 4px 0; }
.preview-article blockquote { border-left: 4px solid var(--bq-border); margin: 0 0 14px; padding: 8px 16px; background: var(--bq-bg); border-radius: 0 8px 8px 0; color: var(--bq-text); }
.preview-article blockquote p:last-child { margin-bottom: 0; }
.preview-article pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px; padding: 14px; overflow-x: auto; margin: 0 0 14px; font-size: 13px; line-height: 1.5; position: relative; }
.preview-article pre[data-lang] { padding-top: 36px; }
.preview-article pre[data-lang]::before { content: attr(data-lang); position: absolute; top: 0; left: 0; right: 0; padding: 6px 12px; font: 600 10px/1 var(--font); color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; border-bottom: 1px solid var(--border); background: var(--surface-hover); border-radius: 8px 8px 0 0; }
.preview-article code { font-family: var(--mono); }
.preview-article :not(pre) > code { background: var(--code-bg); padding: 2px 6px; border-radius: 4px; font-size: .88em; border: 1px solid var(--border); }
.preview-article table { width: 100%; border-collapse: collapse; margin: 0 0 14px; font-size: 14px; }
.preview-article th, .preview-article td { padding: 8px 12px; border: 1px solid var(--border); text-align: left; }
.preview-article th { background: var(--surface-hover); font-weight: 600; color: var(--text); }
.preview-article tr:nth-child(even) { background: var(--surface-hover); }
.preview-article .mdp-table-wrap { overflow-x: auto; margin: 0 0 14px; }
.preview-article .mdp-table-wrap table { margin: 0; }
.preview-article ul, .preview-article ol { margin: 0 0 14px; padding-left: 26px; }
.preview-article li { margin: 3px 0; }
.preview-article li > ul, .preview-article li > ol { margin-bottom: 0; }
.preview-article hr { border: none; height: 2px; background: var(--border); margin: 24px 0; }
.preview-article li input[type="checkbox"] { margin-right: 6px; }
.preview-article del { color: var(--text-muted); }
/* ==highlight== */
.preview-article .su-hl { background: var(--hl-bg); color: var(--hl-text); padding: 0 3px; border-radius: 3px; }
/* find-in-page hits */
.preview-article .find-hit { background: rgba(254, 208, 71, 0.35); border-radius: 2px; }
.preview-article .find-hit.current { background: var(--primary); color: var(--primary-text); }
/* KaTeX */
.preview-article .katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; }
.preview-article .su-math-error { color: #cf222e; font-family: var(--mono); font-size: .9em; }
[data-theme="dark"] .preview-article .su-math-error { color: #ff7b72; }
/* GitHub-style alerts */
.preview-article .markdown-alert { margin: 0 0 14px; padding: 8px 16px; border-left: 4px solid var(--border); border-radius: 0 8px 8px 0; background: var(--bq-bg); color: var(--text); }
.preview-article .markdown-alert > p { margin: 0 0 8px; }
.preview-article .markdown-alert > p:last-child { margin-bottom: 0; }
.preview-article .markdown-alert-title { display: flex; align-items: center; gap: 6px; font-weight: 600; margin: 0 0 6px; }
.preview-article .markdown-alert-note { border-left-color: #1f6feb; } .preview-article .markdown-alert-note .markdown-alert-title { color: #1f6feb; }
.preview-article .markdown-alert-tip { border-left-color: #2da44e; } .preview-article .markdown-alert-tip .markdown-alert-title { color: #2da44e; }
.preview-article .markdown-alert-important { border-left-color: #8957e5; } .preview-article .markdown-alert-important .markdown-alert-title { color: #8957e5; }
.preview-article .markdown-alert-warning { border-left-color: #d29922; } .preview-article .markdown-alert-warning .markdown-alert-title { color: #d29922; }
.preview-article .markdown-alert-caution { border-left-color: #cf222e; } .preview-article .markdown-alert-caution .markdown-alert-title { color: #cf222e; }
/* Mermaid: render into a light figure card so it stays legible in any theme. */
.preview-article .su-mermaid { margin: 0 0 14px; padding: 16px; background: #fff; border: 1px solid var(--border); border-radius: 8px; text-align: center; overflow-x: auto; }
.preview-article .su-mermaid svg { max-width: 100%; height: auto; }
.preview-article .su-mermaid-error { margin: 0 0 14px; padding: 12px 16px; background: var(--bq-bg); border: 1px solid var(--bq-border); border-left-width: 4px; border-radius: 0 8px 8px 0; }
.preview-article .su-mermaid-error-title { margin: 0 0 8px; font-weight: 600; color: var(--text); }
.preview-article .su-mermaid-error pre { margin: 8px 0 0; padding: 8px 10px; }
.preview-article .su-mermaid-error-msg { color: #cf222e; }
[data-theme="dark"] .preview-article .su-mermaid-error-msg { color: #ff7b72; }
/* Loading state (fragment / ?url= hydration) */
.loading-state { min-height: 320px; height: 100%; display: none; flex-direction: column; align-items: center; justify-content: center; gap: 14px; color: var(--text-muted); padding: 40px; text-align: center; }
.loading-state svg { width: 28px; height: 28px; animation: su-spin-edit 1s linear infinite; }
.loading-state .loading-text { font-size: 13px; }
html.su-loading #loadingState { display: flex; }
html.su-loading #emptyState { display: none; }
/* Empty / start state */
.empty-state { min-height: 320px; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text-muted); padding: 40px; text-align: center; }
.empty-state-icon { width: 56px; height: 56px; margin-bottom: 16px; border-radius: 14px; background: var(--surface-hover); border: 1px solid var(--border); display: flex; align-items: center; justify-content: center; color: var(--text-muted); }
.empty-state-icon svg { width: 28px; height: 28px; stroke: currentColor; fill: none; }
.empty-state-title { font-size: 16px; font-weight: 600; margin-bottom: 4px; color: var(--text); }
.empty-state-sub { font-size: 13px; margin-bottom: 18px; max-width: 420px; }
.empty-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin-bottom: 14px; }
.url-form { display: flex; gap: 8px; width: 100%; max-width: 460px; align-items: stretch; }
.url-form input { flex: 1; min-width: 0; padding: 0 10px; height: 24px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font: 12px var(--font); outline: none; }
.url-form .btn-sm { flex: none; }
.url-form input:focus { border-color: var(--text-muted); }
/* Export dropdown */
.export-anchor { position: relative; display: inline-flex; }
.export-anchor .chevron { margin-left: 2px; transition: transform .15s; }
.export-anchor:has(.export-menu:popover-open) .chevron,
#exportBtn[aria-expanded="true"] .chevron { transform: rotate(180deg); }
.export-menu { margin: 0; min-width: 130px; max-width: calc(100vw - 24px); padding: 6px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 10px 30px rgba(0,0,0,0.35); }
.export-item { display: block; width: 100%; padding: 7px 14px; border: none; background: transparent; color: var(--text); font: 13px var(--font); font-weight: 500; cursor: pointer; border-radius: 6px; text-align: left; transition: background .15s; }
.export-item + .export-item { margin-top: 2px; }
.export-item:hover, .export-item:focus-visible { background: var(--surface-hover); outline: none; }
/* Options popover */
.options-anchor { position: relative; display: inline-flex; }
.options-popover { margin: 0; min-width: 260px; max-width: min(360px, calc(100vw - 24px)); padding: 14px 16px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,0.35); }
.options-popover h4 { font-size: 11px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 10px; }
.options-popover label { display: flex; align-items: flex-start; gap: 10px; padding: 6px 0; cursor: pointer; font-size: 13px; color: var(--text); line-height: 1.4; }
.options-popover input[type="checkbox"] { accent-color: var(--primary); cursor: pointer; margin-top: 2px; flex-shrink: 0; }
.options-popover .opt-desc { display: block; font-size: 11px; color: var(--text-muted); margin-top: 2px; overflow-wrap: anywhere; }
.options-popover .opt-desc code { font-family: var(--mono); font-size: 10px; background: var(--surface-hover); padding: 0 4px; border-radius: 3px; }
/* Toast */
.toast { position: fixed; bottom: 20px; right: 20px; background: var(--surface); color: var(--text); padding: 10px 18px; border-radius: 8px; border: 1px solid var(--border); font-size: 13px; z-index: 200; box-shadow: 0 4px 12px rgba(0,0,0,0.3); display: flex; align-items: center; gap: 8px; animation: toastIn .2s ease; }
@keyframes toastIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes su-spin-edit { to { transform: rotate(360deg); } }
#fileInput { display: none; }
.su-footer { text-align: center; padding: 16px; border-top: 1px solid var(--border); color: var(--text-muted); font-size: 0.8rem; transition: border-color .25s, color .25s; }
.su-footer p { margin: 0; }
.su-footer-fineprint { margin-top: 6px !important; font-size: 0.7rem; opacity: 0.75; }
.su-footer-link { background: none; border: none; padding: 0; color: inherit; font: inherit; cursor: pointer; text-decoration: underline; text-underline-offset: 2px; }
.su-footer-link:hover { color: var(--text); }
.su-dialog { max-width: 520px; width: calc(100% - 32px); max-height: calc(100% - 32px); inset: 0; margin: auto; padding: 0; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); color: var(--text); box-shadow: 0 20px 60px rgba(0,0,0,0.4); }
.su-dialog::backdrop { background: rgba(0,0,0,0.45); backdrop-filter: blur(2px); }
.su-dialog-header { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.su-dialog-header h2 { font-size: 1rem; font-weight: 600; }
.su-dialog-close { width: 28px; height: 28px; padding: 0; display: flex; align-items: center; justify-content: center; border-radius: 50%; border: 1px solid var(--border); background: var(--surface); color: var(--text-muted); cursor: pointer; transition: all .15s; }
.su-dialog-close:hover { background: var(--surface-hover); color: var(--text); }
.su-dialog-body { padding: 16px 18px; font-size: 0.875rem; line-height: 1.55; color: var(--text); }
.su-dialog-body p { margin-bottom: 12px; }
.su-dialog-body p:last-child { margin-bottom: 0; }
.su-dialog-body code { font-family: var(--mono); background: var(--surface-hover); padding: 1px 5px; border-radius: 4px; font-size: 0.85em; }
.su-dialog-body a { color: var(--primary); text-decoration: none; }
.su-dialog-body a:hover { text-decoration: underline; }
.su-dialog-fineprint { font-size: 0.8rem; color: var(--text-muted); }
.page-title, .panel-label, .su-dialog-header h2, .card-header { text-wrap: balance; }
.su-dialog-body p, .su-more-tools p, .tool-desc, .empty-state-sub { text-wrap: pretty; }
@media (prefers-reduced-motion: reduce) {
*, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}
.su-credits-list { margin: 0 0 12px; padding-left: 20px; }
.su-credits-list li { margin-bottom: 6px; }
.su-credits-list li:last-child { margin-bottom: 0; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--surface); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
@media (max-width: 960px) { .stats-text { display: none; } }
@media (max-width: 880px) {
#optionsBtn .opt-label { display: none; }
#optionsBtn { padding: 4px 8px; }
.toolbar-actions { gap: 6px; }
}
@media (max-width: 768px) {
main { padding: 12px; }
.output-scroll { padding: 20px; }
.doc-title { max-width: 60vw; }
#exportBtn .btn-label, #shareBtn .btn-label { display: none; }
.view-btn { padding: 0 8px; }
.btn-sm { padding: 5px 9px; height: 23px; font-size: 11px; }
}
@media (max-width: 640px) {
header { padding: 0 12px; }
.logo-svg { height: 20px; }
.logo-badge { font-size: 11px; padding: 2px 7px; }
.btn { padding: 6px 10px; font-size: 12px; }
}
</style>
</head>
<body>
<noscript>
<p class="su-noscript"><strong>Markdown Preview</strong> — A reading-first Markdown previewer with Mermaid diagrams, KaTeX math, GitHub alerts, find-in-page, and self-contained HTML/PDF export. Requires JavaScript; please enable it. Source on <a href="https://github.com/secutils-dev/secutils/blob/main/dev/tools/md.html">GitHub</a>.</p>
</noscript>
<header>
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<div class="header-right">
<a id="skillLink" class="skill-link" href="#" target="_blank" rel="noopener"
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<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
<path d="M9.937 15.5A2 2 0 0 0 8.5 14.063l-6.135-1.582a.5.5 0 0 1 0-.962L8.5 9.936A2 2 0 0 0 9.937 8.5l1.582-6.135a.5.5 0 0 1 .963 0L14.063 8.5A2 2 0 0 0 15.5 9.937l6.135 1.582a.5.5 0 0 1 0 .962L15.5 14.063a2 2 0 0 0-1.437 1.437l-1.582 6.135a.5.5 0 0 1-.963 0z"/>
<path d="M20 3v4"/><path d="M22 5h-4"/><path d="M4 17v2"/><path d="M5 18H3"/>
</svg>
<span>Skill</span>
</a>
<button class="theme-toggle" id="themeToggle" aria-label="Toggle theme">
<svg class="icon-sun" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M8.5 15h-1v-2h1v2Zm-3.674-3.107-1.414 1.414-.707-.707 1.414-1.415.707.708Zm8.479.707-.707.707-1.414-1.414.707-.708 1.414 1.415Z"/><path fill-rule="evenodd" d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Zm0 1a3 3 0 1 0 0 6 3 3 0 0 0 0-6Z" clip-rule="evenodd"/><path d="M3.005 8.505h-2v-1h2v1Zm12 0h-2v-1h2v1ZM4.82 4.114l-.708.707-1.414-1.414.707-.707L4.82 4.114Zm8.492-.707-1.414 1.414-.708-.707L12.605 2.7l.707.707ZM8.5 3h-1V1h1v2Z"/></svg>
<svg class="icon-moon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M4.05 12.95A6.982 6.982 0 0 1 2 8c0-1.79.684-3.583 2.05-4.95A6.982 6.982 0 0 1 9 1a1 1 0 0 1 .708 1.707 4.982 4.982 0 0 0-1.465 3.536 4.98 4.98 0 0 0 1.465 3.535 4.98 4.98 0 0 0 3.535 1.465 1 1 0 0 1 .707 1.707A6.981 6.981 0 0 1 9 15a6.983 6.983 0 0 1-4.95-2.05Zm.708-.707A5.983 5.983 0 0 0 9 14c1.535 0 3.07-.586 4.242-1.757a5.98 5.98 0 0 1-4.018-1.545L9 10.485a5.982 5.982 0 0 1-1.758-4.242A5.986 5.986 0 0 1 9 2a5.983 5.983 0 0 0-4.243 1.757A5.98 5.98 0 0 0 3 8l.006.288a5.978 5.978 0 0 0 1.75 3.955Z"/></svg>
</button>
</div>
</header>
<main>
<div class="toolbar">
<div class="toolbar-left">
<span id="docTitle" class="doc-title">Markdown Preview</span>
<span id="docStats" class="stats-text">empty</span>
</div>
<div class="toolbar-actions">
<button id="openBtn" class="btn btn-sm" title="Open a Markdown file (Ctrl/Cmd+O)">
<svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m6 14 1.45-2.9A2 2 0 0 1 9.24 10H20a2 2 0 0 1 1.94 2.5l-1.55 6A2 2 0 0 1 18.45 20H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h3.9a2 2 0 0 1 1.69.9l.81 1.2a2 2 0 0 0 1.67.9H18a2 2 0 0 1 2 2v2"/></svg>
<span class="btn-label">Open</span>
</button>
<div class="view-switch" role="group" aria-label="View mode">
<button type="button" class="view-btn active" id="viewPreviewBtn" data-view="preview" aria-pressed="true" title="Rendered preview">Preview</button>
<button type="button" class="view-btn" id="viewHtmlBtn" data-view="html" aria-pressed="false" disabled title="Preview the exported self-contained HTML">HTML</button>
<button type="button" class="view-btn" id="viewEditBtn" data-view="edit" aria-pressed="false" title="Edit the Markdown source (Ctrl/Cmd+E)">Source</button>
</div>
<button id="findBtn" class="icon-btn" title="Find in document (Ctrl/Cmd+F)" aria-label="Find in document">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.3-4.3"/></svg>
</button>
<div class="options-anchor">
<button id="optionsBtn" class="btn btn-sm" commandfor="optionsPopover" command="toggle-popover" aria-haspopup="true" title="HTML export options">
<svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-4 0v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1 0-4h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 4 0v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 0 4h-.09a1.65 1.65 0 0 0-1.51 1Z"/></svg>
<span class="opt-label">HTML options</span>
</button>
<div id="optionsPopover" popover class="options-popover" role="dialog" aria-label="HTML export options">
<h4>HTML export options</h4>
<label>
<input type="checkbox" id="optToc" checked>
<span>Table of contents
<span class="opt-desc">Floating sidebar generated from h2/h3 headings.</span>
</span>
</label>
<label>
<input type="checkbox" id="optPdf" checked>
<span>PDF export
<span class="opt-desc">Adds a button to save the page as a PDF.</span>
</span>
</label>
<label>
<input type="checkbox" id="optFind" checked>
<span>Find in page
<span class="opt-desc">Adds a search button (Ctrl/Cmd+F) to find text within the page.</span>
</span>
</label>
<label>
<input type="checkbox" id="optSource">
<span>Embed Markdown source
<span class="opt-desc">Embedded as <code><script type="text/markdown"></code>.</span>
</span>
</label>
</div>
</div>
<div class="export-anchor">
<button id="exportBtn" class="btn btn-sm" disabled commandfor="exportMenu" command="toggle-popover" aria-haspopup="menu" title="Export the document">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M8 2v9"/><path d="M4.5 7.5 8 11l3.5-3.5"/><path d="M3 13.5h10"/></svg>
<span class="btn-label">Export</span>
<svg class="chevron" viewBox="0 0 12 12" width="10" height="10" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m3 5 3 3 3-3"/></svg>
</button>
<div id="exportMenu" popover class="export-menu" role="menu" aria-label="Export menu">
<button class="export-item" role="menuitem" id="exportHtmlBtn">Download HTML</button>
<button class="export-item" role="menuitem" id="exportPdfBtn">Download PDF</button>
<button class="export-item" role="menuitem" id="copyHtmlBtn">Copy HTML</button>
</div>
</div>
<button id="shareBtn" class="btn btn-primary btn-sm" disabled title="Copy a shareable link with your Markdown encoded in the URL">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="12" cy="3.5" r="2"/><circle cx="4" cy="8" r="2"/><circle cx="12" cy="12.5" r="2"/><path d="M5.7 7 10.3 4.5M5.7 9l4.6 2.5"/></svg>
<span class="btn-label">Share</span>
</button>
<button id="fullscreenBtn" class="icon-btn" title="Toggle fullscreen" aria-label="Toggle fullscreen">
<svg id="fullscreenEnterIcon" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M8 3H5a2 2 0 0 0-2 2v3m18 0V5a2 2 0 0 0-2-2h-3m0 18h3a2 2 0 0 0 2-2v-3M3 16v3a2 2 0 0 0 2 2h3"/></svg>
<svg id="fullscreenExitIcon" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="display:none"><path d="M8 3v3a2 2 0 0 1-2 2H3m18 0h-3a2 2 0 0 1-2-2V3m0 18v-3a2 2 0 0 1 2-2h3M3 16h3a2 2 0 0 1 2 2v3"/></svg>
</button>
</div>
</div>
<div id="previewPane">
<div class="output-panel" id="previewWrap">
<div id="previewScroll" class="output-scroll">
<article id="previewArticle" class="preview-article"></article>
<div id="loadingState" class="loading-state" aria-live="polite">
<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" aria-hidden="true"><circle cx="12" cy="12" r="9" opacity=".25"/><path d="M21 12a9 9 0 0 1-9 9" stroke-linecap="round"/></svg>
<span class="loading-text">Loading Markdown…</span>
</div>
<div id="emptyState" class="empty-state">
<div class="empty-state-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"/><path d="M14 2v6h6"/><path d="M9 13h6"/><path d="M9 17h6"/></svg>
</div>
<div class="empty-state-title">Preview any Markdown</div>
<div class="empty-state-sub">Open a file, paste (Ctrl/Cmd+V), drop one here, load the example, or fetch from a public URL.</div>
<div class="empty-actions">
<button id="emptyOpenBtn" class="btn btn-primary btn-sm">Open file</button>
<button id="emptyWriteBtn" class="btn btn-sm">Start writing</button>
<button id="emptyExampleBtn" class="btn btn-sm">Load example</button>
</div>
<form id="urlForm" class="url-form">
<input id="urlInput" type="url" inputmode="url" placeholder="https://raw.githubusercontent.com/…/README.md" aria-label="Markdown URL to load">
<button type="submit" class="btn btn-sm">Load URL</button>
</form>
</div>
</div>
</div>
<div id="editorMount" aria-label="Markdown editor"></div>
<iframe id="htmlPreview" title="Exported HTML preview" sandbox="allow-scripts allow-popups allow-modals allow-downloads"></iframe>
<div id="findBar" class="find-bar" hidden role="search">
<svg viewBox="0 0 24 24" width="14" height="14" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" style="color:var(--text-muted)"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.3-4.3"/></svg>
<input id="findInput" type="text" placeholder="Find in document" aria-label="Find in document" autocomplete="off" spellcheck="false">
<span id="findCount" class="find-count">0/0</span>
<button id="findPrev" class="icon-btn" aria-label="Previous match" title="Previous (Shift+Enter)">
<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m11 10-3-3-3 3"/></svg>
</button>
<button id="findNext" class="icon-btn" aria-label="Next match" title="Next (Enter)">
<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m5 6 3 3 3-3"/></svg>
</button>
<button id="findClose" class="icon-btn" aria-label="Close find" title="Close (Esc)">
<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 3l10 10M13 3L3 13"/></svg>
</button>
</div>
</div>
<aside class="su-more-tools" aria-label="More free tools">
<p>Other free, no-signup Secutils.dev tools for JWT, SAML, certificates, HTTP echo, and more - <a href="https://{{TOOLS_HOST}}/">Browse all tools →</a></p>
</aside>
</main>
<footer class="su-footer">
<p>A reading-first Markdown previewer with Mermaid, KaTeX math, GitHub alerts, and HTML/PDF export.</p>
<p class="su-footer-fineprint">
<button type="button" class="su-footer-link" id="privacyOpen">Privacy</button>
<span aria-hidden="true"> · </span>
<button type="button" class="su-footer-link" id="creditsOpen">Credits</button>
</p>
</footer>
<dialog id="privacyDialog" class="su-dialog" closedby="any" aria-labelledby="privacyDialogTitle">
<header class="su-dialog-header">
<h2 id="privacyDialogTitle">Privacy</h2>
<button type="button" class="su-dialog-close" id="privacyClose" aria-label="Close">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 3l10 10M13 3L3 13"/></svg>
</button>
</header>
<div class="su-dialog-body">
<p><strong>Your data stays in your browser.</strong> These tools run entirely client-side. Tokens, PEMs, SAML payloads, Markdown source, and mock-response bodies are never sent to the Secutils.dev server. State that needs to survive a reload (or be shared) lives in the URL fragment (<code>#…</code>), which browsers never transmit to the server.</p>
<p><strong>Loading from a URL.</strong> When you use <code>?url=</code> or the "Load URL" box, your browser fetches that address directly; the Markdown is read into the page client-side and is never relayed through the Secutils.dev server.</p>
<p><strong>Anonymous usage analytics.</strong> We use <a href="https://plausible.io/" target="_blank" rel="noopener noreferrer">Plausible Analytics</a>, a privacy-first, GDPR-compliant tool, to collect aggregate usage data. No cookies, no personal data, no individual tracking. The data is limited to top pages, referral sources, visit duration, and device-class metadata (device type, OS, country, browser). Full details in the <a href="https://plausible.io/data-policy" target="_blank" rel="noopener noreferrer">Plausible Data Policy</a>.</p>
<p class="su-dialog-fineprint">See the full <a href="https://secutils.dev/privacy" target="_blank" rel="noopener noreferrer">Secutils.dev privacy policy</a> for details on the wider service.</p>
</div>
</dialog>
<dialog id="creditsDialog" class="su-dialog" closedby="any" aria-labelledby="creditsDialogTitle">
<header class="su-dialog-header">
<h2 id="creditsDialogTitle">Credits</h2>
<button type="button" class="su-dialog-close" id="creditsClose" aria-label="Close">
<svg viewBox="0 0 16 16" width="14" height="14" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 3l10 10M13 3L3 13"/></svg>
</button>
</header>
<div class="su-dialog-body">
<p>This tool is powered by the following open-source libraries:</p>
<ul class="su-credits-list">
<li><a href="https://github.com/markedjs/marked" target="_blank" rel="noopener noreferrer"><strong>marked</strong></a> - Markdown parser and compiler, used to render the source into HTML.</li>
<li><a href="https://github.com/highlightjs/highlight.js" target="_blank" rel="noopener noreferrer"><strong>highlight.js</strong></a> - syntax highlighter, used to colourise fenced code blocks.</li>
<li><a href="https://github.com/KaTeX/KaTeX" target="_blank" rel="noopener noreferrer"><strong>KaTeX</strong></a> - math typesetting, used to render <code>$…$</code> and <code>$$…$$</code> formulas.</li>
<li><a href="https://github.com/mermaid-js/mermaid" target="_blank" rel="noopener noreferrer"><strong>Mermaid</strong></a> - diagram renderer, used to turn <code>```mermaid</code> code blocks into inline SVG diagrams.</li>
<li><a href="https://github.com/codemirror/dev" target="_blank" rel="noopener noreferrer"><strong>CodeMirror</strong></a> - extensible code editor, powers the source editing mode.</li>
<li><a href="https://github.com/pagedjs/pagedjs" target="_blank" rel="noopener noreferrer"><strong>Paged.js</strong></a> - CSS Paged Media polyfill, used to paginate the rendered HTML into a vector PDF on Export.</li>
</ul>
<p class="su-dialog-fineprint">All trademarks are property of their respective owners.</p>
</div>
</dialog>
<input type="file" id="fileInput" accept=".md,.markdown,.txt,.mdx">
<div id="toast" class="toast" style="display:none">
<span id="toastMsg"></span>
</div>
<!-- marked / highlight.js are used at top-level inline-script execution (marked.use(...))
so they cannot be `defer`red without restructuring. Network priority is still demoted. -->
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js" fetchpriority="low"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js" fetchpriority="low"></script>
<!-- CodeMirror 6 ESM loader. Falls back to a plain textarea if any import fails. -->
<script type="module">
const mount = document.getElementById('editorMount');
try {
const [cm, cmMd, cmState] = await Promise.all([
import('https://esm.sh/codemirror@6.0.1?bundle'),
import('https://esm.sh/@codemirror/lang-markdown@6.3.0?bundle'),
import('https://esm.sh/@codemirror/state@6.4.1?bundle'),
]);
const view = new cm.EditorView({
state: cmState.EditorState.create({
doc: window.__suInitialDoc || '',
extensions: [
cm.basicSetup,
cmMd.markdown(),
cm.EditorView.lineWrapping,
cm.EditorView.updateListener.of((u) => {
if (u.docChanged) window.__suOnEditorChange?.(u.state.doc.toString());
}),
],
}),
parent: mount,
});
window.__suEditorAPI = {
kind: 'codemirror',
setText: (t) => view.dispatch({ changes: { from: 0, to: view.state.doc.length, insert: t } }),
getText: () => view.state.doc.toString(),
focus: () => view.focus(),
};
window.__suEditorReady?.();
} catch (err) {
console.warn('CodeMirror failed to load, falling back to <textarea>:', err);
const ta = document.createElement('textarea');
ta.className = 'editor-fallback';
ta.spellcheck = false;
ta.placeholder = 'Type or paste Markdown here...';
ta.value = window.__suInitialDoc || '';
ta.addEventListener('input', () => window.__suOnEditorChange?.(ta.value));
mount.replaceChildren(ta);
window.__suEditorAPI = {
kind: 'textarea',
setText: (t) => { ta.value = t; window.__suOnEditorChange?.(t); },
getText: () => ta.value,
focus: () => ta.focus(),
};
window.__suEditorReady?.();
}
</script>
<script>
const PAGEDJS_URL = 'https://cdn.jsdelivr.net/npm/pagedjs@0.4.3/dist/paged.polyfill.js';
const MERMAID_URL = 'https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs';
const KATEX_VERSION = '0.16.11';
const KATEX_CSS_URL = `https://cdn.jsdelivr.net/npm/katex@${KATEX_VERSION}/dist/katex.min.css`;
const KATEX_JS_URL = `https://cdn.jsdelivr.net/npm/katex@${KATEX_VERSION}/dist/katex.mjs`;
const MD_FILE_EXT = /\.(md|markdown|txt|mdx)$/i;
const FRONTMATTER_RE = /^---\r?\n([\s\S]*?)\r?\n---\r?\n/;
const FRONTMATTER_TITLE_RE = /^title:\s*['"]?(.+?)['"]?\s*$/m;
const $ = (id) => document.getElementById(id);
const els = {
previewPane: $('previewPane'),
previewWrap: $('previewWrap'),
previewScroll: $('previewScroll'),
previewArticle: $('previewArticle'),
emptyState: $('emptyState'),
loadingState: $('loadingState'),
editorMount: $('editorMount'),
docTitle: $('docTitle'),
docStats: $('docStats'),
fileInput: $('fileInput'),
themeToggle: $('themeToggle'),
skillLink: $('skillLink'),
openBtn: $('openBtn'),
viewBtns: Array.from(document.querySelectorAll('.view-btn')),
viewHtmlBtn: $('viewHtmlBtn'),
htmlPreview: $('htmlPreview'),
findBtn: $('findBtn'),
emptyOpenBtn: $('emptyOpenBtn'),
emptyWriteBtn: $('emptyWriteBtn'),
emptyExampleBtn: $('emptyExampleBtn'),
urlForm: $('urlForm'),
urlInput: $('urlInput'),
optionsBtn: $('optionsBtn'),
optionsPopover: $('optionsPopover'),
optToc: $('optToc'),
optPdf: $('optPdf'),
optFind: $('optFind'),
optSource: $('optSource'),
shareBtn: $('shareBtn'),
exportBtn: $('exportBtn'),
exportMenu: $('exportMenu'),
exportHtmlBtn: $('exportHtmlBtn'),
exportPdfBtn: $('exportPdfBtn'),
copyHtmlBtn: $('copyHtmlBtn'),
fullscreenBtn: $('fullscreenBtn'),
fullscreenEnterIcon: $('fullscreenEnterIcon'),
fullscreenExitIcon: $('fullscreenExitIcon'),
findBar: $('findBar'),
findInput: $('findInput'),
findCount: $('findCount'),
findPrev: $('findPrev'),
findNext: $('findNext'),
findClose: $('findClose'),
toast: $('toast'),
toastMsg: $('toastMsg'),
};
let markdown = '';
let filename = 'Untitled';
let renderTimer;
let toastTimer;
let viewMode = 'preview'; // 'preview' | 'edit' | 'html'
const isEdit = () => viewMode === 'edit';
// True while a fragment / ?url= load is in flight; the head-set `su-loading`
// class drives the pre-JS paint, JS takes over from here.
let pendingHydration = document.documentElement.classList.contains('su-loading');
document.documentElement.classList.remove('su-loading');
updatePanes(); // hoisted; mirror the head-set loading class via JS-managed styles
const EXAMPLE_MD = [
'# Markdown Preview',
'',
'A fast, **reading-first** Markdown previewer for AI-generated docs, READMEs, plans, and technical notes. The rendered preview is front and center; switch to **Edit** to tweak the source, then **Share** or **Export**.',
'',
'> [!NOTE]',
'> GitHub-style alerts render as callouts: `[!NOTE]`, `[!TIP]`, `[!IMPORTANT]`, `[!WARNING]`, and `[!CAUTION]`.',
'',
'## Features',
'',
'- Live preview with GitHub-flavored Markdown (tables, task lists, ~~strikethrough~~)',
'- ==Highlighted== text via `==marks==`',
'- Math with KaTeX: inline $E = mc^2$ and display blocks',
'- Mermaid diagrams rendered to inline SVG',
'- Find in page, source editing, and self-contained HTML / PDF export',
'',
'- [x] Render Markdown',
'- [ ] Profit',
'',
'## Math',
'',
'The Gaussian integral:',
'',
'$$\\int_{-\\infty}^{\\infty} e^{-x^2}\\,dx = \\sqrt{\\pi}$$',
'',
'## Code',
'',
'```js',
'function greet(name) {',
' return `Hello, ${name}!`;',
'}',
'console.log(greet("world"));',
'```',
'',
'## Diagram',
'',
'```mermaid',
'flowchart LR',
' A[Open Markdown] --> B[Read the preview]',
' B --> C{Need to tweak?}',
' C -->|Yes| D[Edit source]',
' C -->|No| E[Share or Export]',
'```',
'',
'## Table',
'',
'| Feature | Status |',
'|------------------------|--------|',
'| GFM (GitHub-flavoured) | yes |',
'| Syntax highlighting | yes |',
'| Diagrams (Mermaid) | yes |',
'| Math (KaTeX) | yes |',
'',
'## Quote',
'',
'> "The best Markdown is the one you can just read."',
'',
'See the [project on GitHub](https://github.com/secutils-dev/secutils) for source and discussions.',
'',
].join('\n');
// URL state encoding: see dev/tools/AGENTS.md -> "URL state encoding".
const utf8Enc = new TextEncoder();
const utf8Dec = new TextDecoder();
const toBase64Url = (bytes) => {
let s = '';
for (const b of bytes) s += String.fromCharCode(b);
return btoa(s).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
};
const fromBase64Url = (str) => {
const b64 = str.replace(/-/g, '+').replace(/_/g, '/');
const padded = b64 + '==='.slice(0, (4 - b64.length % 4) % 4);
const bin = atob(padded);
const out = new Uint8Array(bin.length);
for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
return out;
};
const encodeState = async (text) => {
const bytes = utf8Enc.encode(text);
const stream = new Blob([bytes]).stream().pipeThrough(new CompressionStream('deflate-raw'));
const deflated = new Uint8Array(await new Response(stream).arrayBuffer());
const out = new Uint8Array(4 + deflated.length);
new DataView(out.buffer).setUint32(0, bytes.length, true);
out.set(deflated, 4);
return toBase64Url(out);
};
const decodeState = async (str) => {
try {
const bytes = fromBase64Url(str);
if (bytes.length < 4) return null;
const stream = new Blob([bytes.subarray(4)]).stream()
.pipeThrough(new DecompressionStream('deflate-raw'));
const inflated = new Uint8Array(await new Response(stream).arrayBuffer());
return utf8Dec.decode(inflated);
} catch { return null; }
};
(() => {
const root = document.documentElement;
const setTheme = (t) => {
root.setAttribute('data-theme', t);
try { localStorage.setItem('su-tool-theme', t); } catch {}
};
els.themeToggle.addEventListener('click', () => {
setTheme(root.getAttribute('data-theme') === 'dark' ? 'light' : 'dark');
});
if (els.skillLink) {
const p = location.pathname;
els.skillLink.href = (p === '/' || p === '') ? '/llms.txt' : p.replace(/\/$/, '') + '.md';
}
try {
const saved = localStorage.getItem('su-tool-theme');
if (saved) setTheme(saved);
else if (window.matchMedia('(prefers-color-scheme: light)').matches) setTheme('light');
} catch {}
})();
(() => {
const dlg = $('privacyDialog');
$('privacyOpen').addEventListener('click', () => dlg.showModal());
$('privacyClose').addEventListener('click', () => dlg.close());
})();
(() => {
const dlg = $('creditsDialog');
$('creditsOpen').addEventListener('click', () => dlg.showModal());
$('creditsClose').addEventListener('click', () => dlg.close());
})();
// Safari fallback for closedby="any" (Newly Baseline elsewhere; limited in Safari as of Q2 2026).
if (!('closedBy' in HTMLDialogElement.prototype)) {
for (const dlg of document.querySelectorAll('dialog.su-dialog')) {
dlg.addEventListener('click', (e) => {
if (e.target !== dlg) return;
const r = dlg.getBoundingClientRect();
if (e.clientX < r.left || e.clientX > r.right || e.clientY < r.top || e.clientY > r.bottom) dlg.close();
});
}
}
marked.use({ gfm: true, breaks: false });
const escHTML = (s) => s.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
// Yield to the event loop between highlight passes so long documents
// don't block input. See AGENTS.md -> "Long tasks (scheduler.yield)".
const yieldToMain = () => 'scheduler' in window && typeof scheduler.yield === 'function'
? scheduler.yield()
: new Promise((r) => setTimeout(r, 0));
// ---- Mermaid (lazy-loaded ESM, pre-rendered to static SVG) ----
let _mermaidPromise;
function ensureMermaid() {
if (!_mermaidPromise) {
_mermaidPromise = import(MERMAID_URL).then((m) => {
const mermaid = m.default;
mermaid.initialize({ startOnLoad: false, securityLevel: 'strict', theme: 'default' });
return mermaid;
}).catch((err) => { _mermaidPromise = undefined; throw err; });
}
return _mermaidPromise;
}
function autoQuoteMermaidLabels(src) {
return src.replace(/(\[)([^\[\]\n]*?[()][^\[\]\n]*?)(\])/g, (m, open, label, close) => {
const t = label.trim();
if (/^".*"$/.test(t) || /^'.*'$/.test(t)) return m;
return `${open}"${t.replace(/"/g, '"')}"${close}`;
});
}
async function sanitizeMermaid(mermaid, src) {
try {
await mermaid.parse(src);
return src;
} catch (firstErr) {
const fixed = autoQuoteMermaidLabels(src);
if (fixed !== src) {
try { await mermaid.parse(fixed); return fixed; } catch { /* fall through */ }
}
throw firstErr;
}
}
const _mermaidCache = new Map();
let _mermaidId = 0;
async function renderMermaid(src) {
if (_mermaidCache.has(src)) return _mermaidCache.get(src);
let mermaid;
try {
mermaid = await ensureMermaid();
} catch {
const e = new Error('Mermaid failed to load');
e.__suMermaidUnavailable = true;
throw e;
}
const cleaned = await sanitizeMermaid(mermaid, src);
const { svg } = await mermaid.render('su-mermaid-' + _mermaidId++, cleaned);
_mermaidCache.set(src, svg);
return svg;
}
async function replaceMermaidBlock(codeEl) {
const pre = codeEl.parentElement;
const src = codeEl.textContent;
try {
const svg = await renderMermaid(src);
const fig = document.createElement('figure');
fig.className = 'su-mermaid';
fig.innerHTML = svg;
pre.replaceWith(fig);
} catch (err) {
if (err && err.__suMermaidUnavailable) {
try { hljs.highlightElement(codeEl); } catch {}
pre.setAttribute('data-lang', 'mermaid');
return;
}
const box = document.createElement('div');
box.className = 'su-mermaid-error';
const msg = (err && err.message) ? err.message : String(err);
box.innerHTML = `<p class="su-mermaid-error-title">Unable to render Mermaid diagram</p>`
+ `<pre class="su-mermaid-error-msg">${escHTML(msg)}</pre>`
+ `<pre class="su-mermaid-error-src">${escHTML(src)}</pre>`;
pre.replaceWith(box);
}
}
// ---- KaTeX (lazy-loaded ESM; delimiter scanner ported from md-preview) ----
let _katexPromise;
function injectKatexCss() {
if (document.getElementById('su-katex-css')) return;
const link = document.createElement('link');
link.id = 'su-katex-css';
link.rel = 'stylesheet';
link.href = KATEX_CSS_URL;
document.head.appendChild(link);
}
function ensureKatex() {
if (!_katexPromise) {
_katexPromise = import(KATEX_JS_URL).then((m) => {
injectKatexCss();
return m.default;
}).catch((err) => { _katexPromise = undefined; throw err; });
}
return _katexPromise;
}
// True when the document plausibly contains math; gates the KaTeX download.
function needsMath(md) {
return /\$\$[\s\S]+?\$\$/.test(md)
|| /\\\([\s\S]+?\\\)/.test(md)
|| /\\\[[\s\S]+?\\\]/.test(md)
|| /(^|[^\\])\$[^\s$][\s\S]*?[^\s\\]\$/m.test(md);
}
function hasClassInTree(el, cls) {
while (el && el !== document.body) {
if (el.classList && el.classList.contains(cls)) return true;
el = el.parentElement;
}
return false;
}
function shouldSkipTextNode(node) {
const el = node.parentElement;
if (!el) return true;
const tag = el.tagName;
if (tag === 'CODE' || tag === 'PRE' || tag === 'KBD' || tag === 'SAMP'
|| tag === 'SCRIPT' || tag === 'STYLE' || tag === 'TEXTAREA' || tag === 'A') return true;
return hasClassInTree(el, 'katex') || hasClassInTree(el, 'su-hl')
|| hasClassInTree(el, 'su-mermaid') || hasClassInTree(el, 'su-mermaid-error');
}
function isEscaped(text, index) {
let count = 0;
for (let i = index - 1; i >= 0 && text[i] === '\\'; i--) count++;
return count % 2 === 1;
}
function findClosing(text, start, delim) {
for (let i = start; i < text.length; i++) {
if (delim === '$') {
if (text[i] === '$' && !isEscaped(text, i) && text[i - 1] && !/\s/.test(text[i - 1])) return i;
} else if (text.substr(i, delim.length) === delim && !isEscaped(text, i)) {
return i;
}
}
return -1;
}
function nextDelimiter(text, index) {
if (text.substr(index, 2) === '$$' && !isEscaped(text, index)) return { open: '$$', close: '$$', display: true };
if (text.substr(index, 2) === '\\[' && !isEscaped(text, index)) return { open: '\\[', close: '\\]', display: true };
if (text.substr(index, 2) === '\\(' && !isEscaped(text, index)) return { open: '\\(', close: '\\)', display: false };
if (text[index] === '$' && !isEscaped(text, index) && text[index + 1] && text[index + 1] !== '$' && !/\s/.test(text[index + 1])) {
return { open: '$', close: '$', display: false };
}
return null;
}
function mathParts(text) {
const parts = [];
let i = 0, last = 0;
while (i < text.length) {
const delim = nextDelimiter(text, i);
if (!delim) { i++; continue; }
const bodyStart = i + delim.open.length;
const closeAt = findClosing(text, bodyStart, delim.close);
if (closeAt < 0) { i += delim.open.length; continue; }
if (i > last) parts.push({ text: text.slice(last, i) });
parts.push({ math: text.slice(bodyStart, closeAt), display: delim.display });
i = closeAt + delim.close.length;
last = i;
}
if (!parts.length) return null;
if (last < text.length) parts.push({ text: text.slice(last) });
return parts;
}
async function enhanceMath(root) {
let katex;
try { katex = await ensureKatex(); } catch { return; }
const walker = document.createTreeWalker(root, NodeFilter.SHOW_TEXT, {
acceptNode: (node) => {
if (shouldSkipTextNode(node)) return NodeFilter.FILTER_REJECT;
return /(\$|\\\(|\\\[)/.test(node.nodeValue) ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT;
},
});
const nodes = [];
while (walker.nextNode()) nodes.push(walker.currentNode);
for (const node of nodes) {
const parts = mathParts(node.nodeValue);
if (!parts) continue;
const frag = document.createDocumentFragment();
for (const part of parts) {
if (part.text !== undefined) { frag.appendChild(document.createTextNode(part.text)); continue; }
const span = document.createElement('span');
try {
katex.render(part.math, span, { displayMode: part.display, throwOnError: false, strict: 'warn', trust: false });
} catch (err) {
span.className = 'su-math-error';
span.textContent = part.display ? `$$${part.math}$$` : `$${part.math}$`;
span.title = err && err.message ? err.message : 'KaTeX render error';