How to resolve SpreadProcessing Cross-Platform Differences Due To Limitations

Updated on Sep 2, 2026

Environment

Version	Product	Author
2026.2.707	RadSpreadProcessing/RadPdfProcessing	Yoan Karamanov

Description

In cross-platform projects, you often use RadSpreadProcessing to work with Excel files and use 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 and Worksheet APIs.
• Working with XLSX files and exporting to PDF through 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
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 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 Both Scenarios

Set a FontsProviderBase implementation to FixedExtensibilityManager 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.

When you use SpreadFixedTextMeasurer, ensure that FixedExtensibilityManager.FontsProvider is configured. The SpreadFixedTextMeasurer performs calcualtions against the used fonts, so if the correct fonts are not provided it falls back to a deafult font and resutls in icorrect calculations and measurements.

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
• Images in PdfProcessing Cross-Platform

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, configure WorksheetPageSetup and PdfExportSettings 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. 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
• Text Measuring in SpreadProcessing
• Exporting Images in SpreadProcessing Cross-Platform
• PdfProcessing Cross-Platform Support
• Fonts in PdfProcessing Cross-Platform
• Images in PdfProcessing Cross-Platform
• How to Implement a FontsProvider
• Worksheet Page Setup
• How to Eliminate Formatting Issues when Exporting XLSX to PDF Format