KB - SpreadProcessing cross-platform

knowledge-base/spreadprocessing-cross-platform.md

@@ -0,0 +1,99 @@
+---
+title: How to resolve SpreadProcessing Cross-Platform Differences Due To Limitations
+description: Resolve layout, font, and image differences when you process Excel files with RadSpreadProcessing and/or export to PDF with RadPdfProcessing in Cross-Platform Apps.
+type: troubleshooting
+page_title: Resolve Cross-Platform Excel and PDF Export Differences | Telerik Document Processing
+slug: spreadprocessing-cross-platform
+tags: spreadprocessing, pdfprocessing, crossplatform, xlsx, pdf, fonts, textmeasuring, images, pagesetup, export
+res_type: kb
+---
+
+## Environment
+
+| Version | Product | Author |
+| --- | --- | --- |
+| 2026.2.707 | RadSpreadProcessing/RadPdfProcessing | [Yoan Karamanov](https://www.telerik.com/blogs/author/yoan-karamanov) |
+
+## Description
+
+In cross-platform projects, you often use [`RadSpreadProcessing`]({%slug radspreadprocessing-overview%}) to work with Excel files and use [`PdfFormatProvider`]({%slug radspreadprocessing-formats-and-conversion-pdf-pdfformatprovider%}) only for Excel to PDF conversion. In this setup, the XLSX result can look correct while the exported PDF result shows clipped text, fallback fonts, or image issues.
+
+This article covers two scenarios:
+
+* Working only with XLSX files through [`Workbook`]({%slug radspreadprocessing-working-with-workbooks-what-is-workbook%}) and [`Worksheet`]({%slug radspreadprocessing-working-with-worksheets-what-is-worksheet%}) APIs.
+* Working with XLSX files and exporting to PDF through [`PdfFormatProvider`]({%slug radspreadprocessing-formats-and-conversion-pdf-pdfformatprovider%}).
+
+## Cause
+
+The cross-platform build does not expose OS-specific APIs for automatic font resolution, text measurement, and image processing. Because of this, XLSX processing and PDF export do not use identical rendering paths unless you configure the required extensibility points.
+
+## Solution
+
+### Apply Configuration Based on the Scenario
+
+Use the following mapping:
+
+| Scenario | Typical Effect | Action |
+| --- | --- | --- |
+| XLSX import, edit, and export only | Incorrect text fit, width, or row-height calculations in specific layouts | Configure [`SpreadExtensibilityManager.TextMeasurer`]({%slug radspreadprocessing-cross-platform-text-measure%}) |
+| XLSX to PDF export | Missing symbols, fallback fonts, clipped text, image export issues, and page layout differences | Configure text measuring, fonts, images, and page setup before export |
+
+### Configure Text Measuring for Both Scenarios
+
+Set [`SpreadExtensibilityManager.TextMeasurer`]({%slug radspreadprocessing-cross-platform-text-measure%}) to improve text sizing:
+
+```csharp
+SpreadTextMeasurerBase fixedTextMeasurer = new SpreadFixedTextMeasurer();
+SpreadExtensibilityManager.TextMeasurer = fixedTextMeasurer;
+```
+
+Text measuring affects both XLSX-only and XLSX to PDF workflows.
+
+### Configure Fonts for XLSX to PDF Export
+
+Set a [`FontsProviderBase`]({%slug radpdfprocessing-cross-platform-fonts%}) implementation to [`FixedExtensibilityManager`]({%slug radpdfprocessing-cross-platform%}) so the exporter can read and embed document fonts:
+
+```csharp
+FontsProviderBase fontsProvider = new FontsProvider();
+FixedExtensibilityManager.FontsProvider = fontsProvider;
+```
+
+If fonts are not resolved, the PDF export pipeline falls back to standard PDF fonts and the result differs from the original XLSX file.
+
+>important When you use `SpreadFixedTextMeasurer` for PDF export, also configure `FixedExtensibilityManager.FontsProvider` to avoid font fallback.
+
+### Configure Image Processing for XLSX to PDF Export
+
+If the workbook contains images that require conversion or metadata parsing, configure the image extensibility points described in:
+
+* [Exporting Images in SpreadProcessing Cross-Platform]({%slug radspreadprocessing-cross-platform-images%})
+* [Images in PdfProcessing Cross-Platform]({%slug radpdfprocessing-cross-platform-images%})
+
+Without this setup, export can fail or produce different image output.
+
+### Configure Page Setup and PDF Export Settings for XLSX to PDF
+
+Before calling [`PdfFormatProvider`]({%slug radspreadprocessing-formats-and-conversion-pdf-pdfformatprovider%}), configure [`WorksheetPageSetup`]({%slug radspreadprocessing-features-worksheetpagesetup%}) and [`PdfExportSettings`]({%slug radspreadprocessing-format-and-conversion-pdf-settings%}) to control scaling, margins, paper size, and exported range:
+
+```csharp
+WorksheetPageSetup pageSetup = workbook.ActiveWorksheet.WorksheetPageSetup;
+pageSetup.FitToPages = true;
+pageSetup.FitToPagesWide = 1;
+pageSetup.FitToPagesTall = 0;
+```
+
+### Handle Known Cross-Platform Limits
+
+Chart export to PDF is not supported in .NET Standard for [`RadSpreadProcessing`]({%slug radspreadprocessing-cross-platform%}). If your workbook depends on chart visuals, use an alternative workflow such as pre-rendering charts outside the PDF export pipeline.
+
+## See Also
+
+* [SpreadProcessing Cross-Platform Support]({%slug radspreadprocessing-cross-platform%})
+* [Text Measuring in SpreadProcessing]({%slug radspreadprocessing-cross-platform-text-measure%})
+* [Exporting Images in SpreadProcessing Cross-Platform]({%slug radspreadprocessing-cross-platform-images%})
+* [PdfProcessing Cross-Platform Support]({%slug radpdfprocessing-cross-platform%})
+* [Fonts in PdfProcessing Cross-Platform]({%slug radpdfprocessing-cross-platform-fonts%})
+* [Images in PdfProcessing Cross-Platform]({%slug radpdfprocessing-cross-platform-images%})
+* [How to Implement a FontsProvider]({%slug pdfprocessing-implement-fontsprovider%})
+* [Worksheet Page Setup]({%slug radspreadprocessing-features-worksheetpagesetup%})
+* [How to Eliminate Formatting Issues when Exporting XLSX to PDF Format]({%slug exporting-xlsx-to-pdf-formatting-issues%})

libraries/radspreadprocessing/cross-platform-support/cross-platform.md

@@ -73,3 +73,4 @@ Some features require additional settings:
 * [What is a Worksheet?]({%slug radspreadprocessing-working-with-worksheets-what-is-worksheet%})
 * [Get, Set and Clear Cell Properties]({%slug radspreadprocessing-working-with-cells-get-set-clear-properties%})
 * [Using XlsxFormatProvider]({%slug radspreadprocessing-formats-and-conversion-xlsx-xlsxformatprovider%})
+* [Troubleshooting Cross-Platform Excel and PDF Export Differences]({%slug spreadprocessing-cross-platform%})