Custom Fonts in PDF export broken

[alexandersitko]

Preflight Checklist

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Describe the bug
PDF-export with custom font is broken, it exports another font

To Reproduce
Steps to reproduce the behavior:

1. Add text with a custom font (e.g. Segoe UI)
2. Export as PDF
3. PDF-export has different font

Expected behavior
The exported PDF should display the correct font, as previously

Screenshots
Should be self-explanatory...

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version 29.6.1.

Desktop (please complete the following information):

• OS: Win11
• Browser: Chrome
• Browser Version 141 (and others)

I tested the problem in incognito/private mode with all browser extensions switched off, write "yes" below:
yes

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: The user reports that PDF export in draw.io 29.6.1 renders custom fonts (e.g., Segoe UI) incorrectly, substituting a different font instead of the one used in the diagram. This appears to be a regression from previous behavior.

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💡 Possible Solution Found

We found a potentially relevant solution in a previous issue:

A similar issue with custom/Google fonts not appearing correctly in PDF exports was reported in #1198. The solution involved re-applying the font to affected text elements: select all text elements, re-apply the same font (which triggers draw.io to detect a change), save, and then re-export as PDF. This fix was originally noted for version 13.6.7 but the same approach may resolve the issue. Additionally, from #4527, try adjusting PDF export settings — specifically, untick 'Include a copy of my diagram' in the export dialog, which changes how the PDF is generated and may resolve font rendering issues.

📎 Source: #1198

Please check if this addresses your issue. If not, let us know what's different about your situation.

🔍 Possible Related Issues

This issue might be related to existing issues:

🟡 #4527 - New PDF exports break pdflatex
Related to PDF export issues and includes workaround of changing PDF export settings (unticking 'Include a copy of my diagram').

🟡 #3545 - greyscaled text rendered black when custom font text exported to pdf with print option
Involves custom fonts behaving incorrectly specifically in PDF export, though the specific symptom differs.

Please check if any of these address your issue. If this is a duplicate, we may close this issue and continue the conversation there.

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[alexandersitko]

unticking 'Include a copy of my diagram' doesn't change the behavior. The substituted font is still rendered.
Re-applying the same font doesn't work either.

[davidjgraph]

How did you select the font? Is it a system, google or web font?

[alexandersitko]

The font is a system font.
Looking at my exported files, the change must have been somewhere between November 9th (last working file) and March 15th (first file with the error)