diff --git a/src/_locales/de/main.json b/src/_locales/de/main.json
index e09c196aa..0d6a37e08 100644
--- a/src/_locales/de/main.json
+++ b/src/_locales/de/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Benutzerdefinierter Website-Regex",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Nur benutzerdefinierten Website-Regex verwenden, um Website-Übereinstimmungen zu finden und interne Regeln ignorieren",
   "Input Query": "Eingabeaufforderung",
+  "Resize input box": "Größe des Eingabefelds ändern",
   "Append Query": "Am Ende anhängen",
   "Prepend Query": "Am Anfang hinzufügen",
   "Wechat Pay": "WeChat-Pay",
diff --git a/src/_locales/en/main.json b/src/_locales/en/main.json
index fd34aa442..a913425b9 100644
--- a/src/_locales/en/main.json
+++ b/src/_locales/en/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Custom Site Regex",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Exclusively use Custom Site Regex for website matching, ignoring built-in rules",
   "Input Query": "Input Query",
+  "Resize input box": "Resize input box",
   "Append Query": "Append Query",
   "Prepend Query": "Prepend Query",
   "Wechat Pay": "Wechat Pay",
diff --git a/src/_locales/es/main.json b/src/_locales/es/main.json
index 5e0f6e553..f8038a126 100644
--- a/src/_locales/es/main.json
+++ b/src/_locales/es/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Expresión regular personalizada del sitio",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Utilice exclusivamente expesiones regulares personalizadas para la coincidencia de sitios web, ignorando las reglas integradas",
   "Input Query": "Consulta de entrada",
+  "Resize input box": "Cambiar el tamaño del cuadro de entrada",
   "Append Query": "Añadir consulta",
   "Prepend Query": "Insertar consulta",
   "Wechat Pay": "Pago de Wechat",
diff --git a/src/_locales/fr/main.json b/src/_locales/fr/main.json
index b125b3975..c9f76e4e3 100644
--- a/src/_locales/fr/main.json
+++ b/src/_locales/fr/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Expression régulière de site personnalisée",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Utiliser exclusivement l'expression régulière de site personnalisée pour la correspondance de site Web, en ignorant les règles intégrées",
   "Input Query": "Sélecteur d'entrée",
+  "Resize input box": "Redimensionner le champ de saisie",
   "Append Query": "Sélecteur à ajouter",
   "Prepend Query": "Sélecteur à insérer",
   "Wechat Pay": "Paiement Wechat",
diff --git a/src/_locales/in/main.json b/src/_locales/in/main.json
index 99619e5bf..1e3ca93e7 100644
--- a/src/_locales/in/main.json
+++ b/src/_locales/in/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Regex Situs Kustom",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Gunakan secara eksklusif Regex Situs Kustom untuk pencocokan situs web, mengabaikan aturan bawaan",
   "Input Query": "Query Masukan",
+  "Resize input box": "Ubah ukuran kotak input",
   "Append Query": "Tambahkan Query",
   "Prepend Query": "Tambahkan Query di Awal",
   "Wechat Pay": "Pembayaran Wechat",
diff --git a/src/_locales/it/main.json b/src/_locales/it/main.json
index a7146afad..c45a81df1 100644
--- a/src/_locales/it/main.json
+++ b/src/_locales/it/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Espressione regolare del sito personalizzata",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Usa esclusivamente l'espressione regolare del sito personalizzata per la corrispondenza dei siti Web, ignorando le regole incorporate",
   "Input Query": "Query di input",
+  "Resize input box": "Ridimensiona la casella di input",
   "Append Query": "Query di appendice",
   "Prepend Query": "Query di aggiunta in testa",
   "Wechat Pay": "Paga con Wechat",
diff --git a/src/_locales/ja/main.json b/src/_locales/ja/main.json
index 38d91a4ec..453cae577 100644
--- a/src/_locales/ja/main.json
+++ b/src/_locales/ja/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "カスタムサイトの正規表現",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "内蔵ルールを無視して、カスタムサイト用の正規表現のみを使用",
   "Input Query": "入力クエリ",
+  "Resize input box": "入力欄のサイズを変更",
   "Append Query": "末尾に追加するクエリ",
   "Prepend Query": "先頭に挿入するクエリ",
   "Wechat Pay": "Wechatペイ",
diff --git a/src/_locales/ko/main.json b/src/_locales/ko/main.json
index 595559dcb..333e29777 100644
--- a/src/_locales/ko/main.json
+++ b/src/_locales/ko/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "사용자 정의 사이트 Regex",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "사이트 일치에 독점적으로 사용자 정의 사이트 Regex를 사용하며, 내장 규칙을 무시합니다.",
   "Input Query": "입력 쿼리 선택기",
+  "Resize input box": "입력 상자 크기 조절",
   "Append Query": "끝에 추가할 쿼리 선택기",
   "Prepend Query": "앞에 추가할 쿼리 선택기",
   "Wechat Pay": "위챗 페이",
diff --git a/src/_locales/pt/main.json b/src/_locales/pt/main.json
index 88db48125..e0b5cd26a 100644
--- a/src/_locales/pt/main.json
+++ b/src/_locales/pt/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Expressão Regular do Site Personalizada",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Usar exclusivamente a Expressão Regular do Site Personalizada para combinação de sites, ignorando regras incorporadas",
   "Input Query": "Consulta de Entrada",
+  "Resize input box": "Redimensionar a caixa de entrada",
   "Append Query": "Consulta Anexada",
   "Prepend Query": "Consulta Prependida",
   "Wechat Pay": "Pagamento Wechat",
diff --git a/src/_locales/ru/main.json b/src/_locales/ru/main.json
index f0cdbcbad..4394b3c76 100644
--- a/src/_locales/ru/main.json
+++ b/src/_locales/ru/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Пользовательское регулярное выражение сайта",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Использовать только пользовательское регулярное выражение сайта для сопоставления сайта, игнорируя встроенные правила.",
   "Input Query": "Входной запрос",
+  "Resize input box": "Изменить размер поля ввода",
   "Append Query": "Добавить запрос",
   "Prepend Query": "Вставить запрос",
   "Wechat Pay": "Wechat-платеж",
diff --git a/src/_locales/tr/main.json b/src/_locales/tr/main.json
index 438f017c1..dd62ccc52 100644
--- a/src/_locales/tr/main.json
+++ b/src/_locales/tr/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "Özel Site Regex'i",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "Yerleşik kuralları yok sayarak web sitesi eşleştirme için yalnızca Özel Site Regex'i kullan",
   "Input Query": "Girdi Sorgusu",
+  "Resize input box": "Giriş kutusunu yeniden boyutlandır",
   "Append Query": "Sorgu Ekle",
   "Prepend Query": "Sorgu Ön Eki",
   "Wechat Pay": "Wechat Pay",
diff --git a/src/_locales/zh-hans/main.json b/src/_locales/zh-hans/main.json
index 8a02d2d3f..d2b9ae705 100644
--- a/src/_locales/zh-hans/main.json
+++ b/src/_locales/zh-hans/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "自定义站点正则匹配",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "只使用自定义站点正则匹配, 忽略内置站点规则",
   "Input Query": "输入的查询选择器",
+  "Resize input box": "调整输入框大小",
   "Append Query": "挂载到末尾的查询选择器",
   "Prepend Query": "插入到开头的查询选择器",
   "Wechat Pay": "微信打赏",
diff --git a/src/_locales/zh-hant/main.json b/src/_locales/zh-hant/main.json
index 8b1c632d8..d2c41a721 100644
--- a/src/_locales/zh-hant/main.json
+++ b/src/_locales/zh-hant/main.json
@@ -20,6 +20,7 @@
   "Custom Site Regex": "自訂網站正規表達式",
   "Exclusively use Custom Site Regex for website matching, ignoring built-in rules": "僅使用自訂網站正規表達式進行網站配對，忽略內建規則",
   "Input Query": "輸入查詢選擇器",
+  "Resize input box": "調整輸入框大小",
   "Append Query": "附加查詢選擇器",
   "Prepend Query": "插入查詢選擇器",
   "Wechat Pay": "微信支付贊助",
diff --git a/src/components/ConversationCard/index.jsx b/src/components/ConversationCard/index.jsx
index f7137506e..ca8765af4 100644
--- a/src/components/ConversationCard/index.jsx
+++ b/src/components/ConversationCard/index.jsx
@@ -572,7 +572,7 @@ function ConversationCard(props) {
         className="markdown-body"
         style={
           props.notClampSize
-            ? { flexGrow: 1 }
+            ? { flexGrow: 1, minHeight: 0 }
             : { maxHeight: windowSize[1] * 0.55 + 'px', resize: 'vertical' }
         }
       >
diff --git a/src/components/InputBox/index.jsx b/src/components/InputBox/index.jsx
index c0adcc9ed..d50f95f2f 100644
--- a/src/components/InputBox/index.jsx
+++ b/src/components/InputBox/index.jsx
@@ -1,51 +1,89 @@
-import { useEffect, useRef, useState } from 'react'
+import { useEffect, useLayoutEffect, useRef, useState } from 'react'
 import PropTypes from 'prop-types'
-import { isFirefox, isMobile, isSafari, updateRefHeight } from '../../utils'
+import { isMobile, updateRefHeight } from '../../utils'
 import { useTranslation } from 'react-i18next'
 import { getUserConfig } from '../../config/index.mjs'
+import {
+  clampInputHeight,
+  DEFAULT_INPUT_HEIGHT,
+  getKeyboardInputHeight,
+  getPointerInputHeight,
+  MIN_CONVERSATION_HEIGHT,
+  MIN_INPUT_HEIGHT,
+} from './resize.mjs'
 
 export function InputBox({ onSubmit, enabled, postMessage, reverseResizeDir }) {
   const { t } = useTranslation()
   const [value, setValue] = useState('')
-  const reverseDivRef = useRef(null)
   const inputRef = useRef(null)
   const resizedRef = useRef(false)
-  const [internalReverseResizeDir, setInternalReverseResizeDir] = useState(reverseResizeDir)
+  const resizeHandleRef = useRef(null)
+  const resizeStartRef = useRef(null)
+  const hasTopResizeHandle = Boolean(reverseResizeDir && !isMobile())
+  const [inputHeight, setInputHeight] = useState(DEFAULT_INPUT_HEIGHT)
+  const [maxInputHeight, setMaxInputHeight] = useState(DEFAULT_INPUT_HEIGHT)
 
   useEffect(() => {
-    setInternalReverseResizeDir(
-      !isSafari() && !isFirefox() && !isMobile() ? internalReverseResizeDir : false,
-    )
+    inputRef.current.focus()
   }, [])
 
-  const virtualInputRef = internalReverseResizeDir ? reverseDivRef : inputRef
-
   useEffect(() => {
-    inputRef.current.focus()
+    if (hasTopResizeHandle) return
 
+    const input = inputRef.current
     const onResizeY = () => {
-      if (virtualInputRef.current.h !== virtualInputRef.current.offsetHeight) {
-        virtualInputRef.current.h = virtualInputRef.current.offsetHeight
+      if (input.h !== input.offsetHeight) {
+        input.h = input.offsetHeight
         if (!resizedRef.current) {
           resizedRef.current = true
-          virtualInputRef.current.style.maxHeight = ''
+          input.style.maxHeight = ''
         }
       }
     }
-    virtualInputRef.current.h = virtualInputRef.current.offsetHeight
-    virtualInputRef.current.addEventListener('mousemove', onResizeY)
-  }, [])
+    input.h = input.offsetHeight
+    input.addEventListener('mousemove', onResizeY)
+    return () => input.removeEventListener('mousemove', onResizeY)
+  }, [hasTopResizeHandle])
 
   useEffect(() => {
-    if (!resizedRef.current) {
-      if (!internalReverseResizeDir) {
-        updateRefHeight(inputRef)
-        virtualInputRef.current.h = virtualInputRef.current.offsetHeight
-        virtualInputRef.current.style.maxHeight = '160px'
-      }
+    if (!resizedRef.current && !hasTopResizeHandle) {
+      updateRefHeight(inputRef)
+      inputRef.current.h = inputRef.current.offsetHeight
+      inputRef.current.style.maxHeight = `${DEFAULT_INPUT_HEIGHT}px`
     }
   })
 
+  const getMaxInputHeight = () => {
+    const container = inputRef.current?.closest('.gpt-inner')
+    const conversation = container?.querySelector('.markdown-body')
+    const resizeHandle = resizeHandleRef.current
+
+    if (!container || !conversation || !resizeHandle) return DEFAULT_INPUT_HEIGHT
+
+    return Math.max(
+      MIN_INPUT_HEIGHT,
+      container.clientHeight -
+        conversation.offsetTop -
+        resizeHandle.offsetHeight -
+        MIN_CONVERSATION_HEIGHT,
+    )
+  }
+
+  useLayoutEffect(() => {
+    if (!hasTopResizeHandle) return
+
+    const updateResizeBounds = () => {
+      const maxHeight = getMaxInputHeight()
+      if (resizeStartRef.current) resizeStartRef.current.maxHeight = maxHeight
+      setMaxInputHeight(maxHeight)
+      setInputHeight((height) => clampInputHeight(height, maxHeight))
+    }
+
+    updateResizeBounds()
+    window.addEventListener('resize', updateResizeBounds)
+    return () => window.removeEventListener('resize', updateResizeBounds)
+  }, [hasTopResizeHandle])
+
   useEffect(() => {
     if (enabled)
       getUserConfig().then((config) => {
@@ -67,29 +105,90 @@ export function InputBox({ onSubmit, enabled, postMessage, reverseResizeDir }) {
     }
   }
 
+  const handleResizePointerDown = (e) => {
+    if (!e.isPrimary || e.button !== 0) return
+
+    e.currentTarget.focus()
+    e.preventDefault()
+    const maxHeight = getMaxInputHeight()
+    setMaxInputHeight(maxHeight)
+    resizeStartRef.current = {
+      pointerId: e.pointerId,
+      height: inputRef.current.offsetHeight,
+      y: e.clientY,
+      maxHeight,
+    }
+    e.currentTarget.setPointerCapture(e.pointerId)
+  }
+
+  const handleResizePointerMove = (e) => {
+    const resizeStart = resizeStartRef.current
+    if (!resizeStart || resizeStart.pointerId !== e.pointerId) return
+
+    e.preventDefault()
+    setInputHeight(
+      getPointerInputHeight(resizeStart.height, resizeStart.y, e.clientY, resizeStart.maxHeight),
+    )
+  }
+
+  const stopResizing = (e) => {
+    if (resizeStartRef.current?.pointerId !== e.pointerId) return
+
+    const restoreInputFocus = document.activeElement === e.currentTarget
+    resizeStartRef.current = null
+    if (e.currentTarget.hasPointerCapture(e.pointerId)) {
+      e.currentTarget.releasePointerCapture(e.pointerId)
+    }
+    if (restoreInputFocus) inputRef.current.focus()
+  }
+
+  const handleResizeKeyDown = (e) => {
+    if (!['ArrowUp', 'ArrowDown', 'Home', 'End'].includes(e.key)) return
+
+    const maxHeight = getMaxInputHeight()
+    e.preventDefault()
+    setMaxInputHeight(maxHeight)
+    setInputHeight(
+      (height) => getKeyboardInputHeight(height, e.key, maxHeight, e.shiftKey) ?? height,
+    )
+  }
+
   return (
     <div className="input-box">
+      {hasTopResizeHandle && (
+        <div
+          ref={resizeHandleRef}
+          className="input-resize-handle"
+          role="separator"
+          aria-controls="chatgptbox-independent-input"
+          aria-label={t('Resize input box')}
+          aria-orientation="horizontal"
+          aria-valuemax={maxInputHeight}
+          aria-valuemin={MIN_INPUT_HEIGHT}
+          aria-valuenow={inputHeight}
+          tabIndex={0}
+          onKeyDown={handleResizeKeyDown}
+          onLostPointerCapture={stopResizing}
+          onPointerCancel={stopResizing}
+          onPointerDown={handleResizePointerDown}
+          onPointerMove={handleResizePointerMove}
+          onPointerUp={stopResizing}
+        />
+      )}
       <div
-        ref={reverseDivRef}
-        style={
-          internalReverseResizeDir && {
-            transform: 'rotateX(180deg)',
-            resize: 'vertical',
-            overflow: 'hidden',
-            minHeight: '160px',
-          }
-        }
+        className={hasTopResizeHandle ? 'input-resize-content' : undefined}
+        style={hasTopResizeHandle ? { height: `${inputHeight}px` } : undefined}
       >
         <textarea
+          id={hasTopResizeHandle ? 'chatgptbox-independent-input' : undefined}
           dir="auto"
           ref={inputRef}
           disabled={false}
           className="interact-input"
-          style={
-            internalReverseResizeDir
-              ? { transform: 'rotateX(180deg)', resize: 'none' }
-              : { resize: 'vertical', minHeight: '70px' }
-          }
+          style={{
+            resize: hasTopResizeHandle ? 'none' : 'vertical',
+            minHeight: `${MIN_INPUT_HEIGHT}px`,
+          }}
           placeholder={
             enabled
               ? t('Type your question here\nEnter to send, shift + enter to break line')
diff --git a/src/components/InputBox/resize.mjs b/src/components/InputBox/resize.mjs
new file mode 100644
index 000000000..1e207fb55
--- /dev/null
+++ b/src/components/InputBox/resize.mjs
@@ -0,0 +1,32 @@
+export const DEFAULT_INPUT_HEIGHT = 160
+export const MIN_INPUT_HEIGHT = 70
+export const MIN_CONVERSATION_HEIGHT = 80
+
+const INPUT_RESIZE_KEY_STEP = 10
+const INPUT_RESIZE_KEY_LARGE_STEP = 40
+
+export function clampInputHeight(height, maxHeight) {
+  const safeMaxHeight = Math.max(MIN_INPUT_HEIGHT, maxHeight)
+  return Math.min(Math.max(MIN_INPUT_HEIGHT, height), safeMaxHeight)
+}
+
+export function getPointerInputHeight(startHeight, startY, currentY, maxHeight) {
+  return clampInputHeight(startHeight + startY - currentY, maxHeight)
+}
+
+export function getKeyboardInputHeight(currentHeight, key, maxHeight, useLargeStep = false) {
+  const step = useLargeStep ? INPUT_RESIZE_KEY_LARGE_STEP : INPUT_RESIZE_KEY_STEP
+
+  switch (key) {
+    case 'ArrowUp':
+      return clampInputHeight(currentHeight + step, maxHeight)
+    case 'ArrowDown':
+      return clampInputHeight(currentHeight - step, maxHeight)
+    case 'Home':
+      return MIN_INPUT_HEIGHT
+    case 'End':
+      return Math.max(MIN_INPUT_HEIGHT, maxHeight)
+    default:
+      return null
+  }
+}
diff --git a/src/content-script/styles.scss b/src/content-script/styles.scss
index 1169103e0..be52d8c2c 100644
--- a/src/content-script/styles.scss
+++ b/src/content-script/styles.scss
@@ -1350,6 +1350,40 @@
     display: contents;
   }
 
+  .input-resize-handle {
+    position: relative;
+    flex: 0 0 9px;
+    cursor: ns-resize;
+    touch-action: none;
+    user-select: none;
+    background-color: var(--theme-color);
+
+    &::after {
+      position: absolute;
+      top: 50%;
+      left: 50%;
+      width: 36px;
+      height: 2px;
+      border-radius: 1px;
+      background-color: var(--theme-border-color);
+      content: '';
+      transform: translate(-50%, -50%);
+    }
+
+    &:hover::after {
+      background-color: var(--font-active-color);
+    }
+
+    &:focus-visible {
+      outline: 2px solid var(--font-active-color);
+      outline-offset: -2px;
+    }
+  }
+
+  .input-resize-content {
+    flex: 0 0 auto;
+  }
+
   .interact-input {
     box-sizing: border-box;
     padding: 5px 15px;
diff --git a/tests/unit/components/input-box-resize.test.mjs b/tests/unit/components/input-box-resize.test.mjs
new file mode 100644
index 000000000..09eb8f9f0
--- /dev/null
+++ b/tests/unit/components/input-box-resize.test.mjs
@@ -0,0 +1,42 @@
+import assert from 'node:assert/strict'
+import { describe, it } from 'node:test'
+import {
+  clampInputHeight,
+  getKeyboardInputHeight,
+  getPointerInputHeight,
+  MIN_INPUT_HEIGHT,
+} from '../../../src/components/InputBox/resize.mjs'
+
+describe('input box resize helpers', () => {
+  it('grows upward and shrinks downward within the available range', () => {
+    assert.equal(getPointerInputHeight(160, 200, 150, 300), 210)
+    assert.equal(getPointerInputHeight(160, 200, 230, 300), 130)
+  })
+
+  it('clamps pointer resizing to the minimum and maximum heights', () => {
+    assert.equal(getPointerInputHeight(160, 200, 400, 300), MIN_INPUT_HEIGHT)
+    assert.equal(getPointerInputHeight(160, 200, 0, 300), 300)
+  })
+
+  it('uses the minimum height when the available range is smaller', () => {
+    assert.equal(clampInputHeight(160, 40), MIN_INPUT_HEIGHT)
+  })
+
+  it('supports keyboard resizing and larger shift-key steps', () => {
+    assert.equal(getKeyboardInputHeight(160, 'ArrowUp', 300), 170)
+    assert.equal(getKeyboardInputHeight(160, 'ArrowDown', 300), 150)
+    assert.equal(getKeyboardInputHeight(160, 'ArrowUp', 300, true), 200)
+    assert.equal(getKeyboardInputHeight(160, 'ArrowDown', 300, true), 120)
+  })
+
+  it('supports the minimum and maximum keyboard shortcuts', () => {
+    assert.equal(getKeyboardInputHeight(160, 'Home', 300), MIN_INPUT_HEIGHT)
+    assert.equal(getKeyboardInputHeight(160, 'End', 300), 300)
+  })
+
+  it('ignores unrelated keys and does not cross keyboard bounds', () => {
+    assert.equal(getKeyboardInputHeight(160, 'Enter', 300), null)
+    assert.equal(getKeyboardInputHeight(MIN_INPUT_HEIGHT, 'ArrowDown', 300), MIN_INPUT_HEIGHT)
+    assert.equal(getKeyboardInputHeight(300, 'ArrowUp', 300), 300)
+  })
+})