Crop is not tight around the image when exporting LaTeX text to svg/pdf

[nhatkhangcs]

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.

You must search the issue tracker and agree to the code of conduct. You must fill in this entire template. If you delete part/all or miss parts out your issue will be closed.

If you are technical, you should report bugs along the lines of https://marker.io/blog/how-to-write-bug-report. If you are not technical, we will make allowances, please try to make an effort to understand the process.

Bug description

Version: v29.7.12
Demo file: Link
Reproduction steps:

1. Normal mathematical display: $$F$$ and export to PDF (border margin set to 5) --> the crop is tight to the math text, which is what I want
2. Change to $$\mathcal{F}$$ and export to PDF (border margin set to 5) --> the crop is not tight (extended to left and right side, depend on justification: left or right of the text display). Expected: The crop should also tight just like first display.

For comparison, I have put those 2 displays in the demo link.

[draw-io-triage-bot]

👋 Thank you for opening this issue!

---

Summary: When exporting a diagram containing LaTeX text using certain commands (e.g., \mathcal{F}) to SVG or PDF, the crop/bounding box is not tight around the rendered text, resulting in excess whitespace on the left or right depending on text justification. Simple LaTeX like $F$ crops correctly.

---

🔍 Possible Related Issues

This issue might be related to existing issues:

🔴 #3311 - Crop is not tight around the image when exporting an image including LaTeX text to svg/pdf
The title and description are nearly identical — both report that the crop/bounding box is not tight around LaTeX-rendered text when exporting to SVG/PDF. This new issue appears to be the same underlying problem, possibly a regression or an unresolved case of the original report.

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

📝 Additional Information Needed

To help us investigate this more effectively, could you please provide:

• platform: Whether this is on draw.io desktop, web (app.diagrams.net), or a plugin (Confluence, etc.)
• screenshots: Screenshots showing the difference between the tight crop with $F$ and the loose crop with $\mathcal{F}$ would help illustrate the issue more clearly

We also have some questions:

• Is this issue specific to \mathcal or does it also occur with other LaTeX commands like \mathbb, \mathfrak, etc.?
• Does the issue occur for both SVG and PDF export, or only one of them?
• Are you using draw.io desktop or the web version (app.diagrams.net)?

📋 Bug Report Template

**Environment:**
- draw.io version: [e.g., web app / desktop 24.x.x / Confluence plugin]
- Browser (if web): [e.g., Chrome 120, Firefox 121]
- OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]

**Steps to Reproduce:**
1. Go to ...
2. Click on ...
3. See error

**Expected Behavior:**
What you expected to happen.

**Actual Behavior:**
What actually happened.

**Screenshots/Files:**
If applicable, add screenshots or attach the .drawio file.

---

---

_{🤖 This is an automated response to help with initial triage. A human maintainer will review this issue. If you've provided all the requested information, no further action is needed - we'll get back to you soon!}

[davidjgraph]

Please test again with 30.0.0

[nhatkhangcs]

Hi @davidjgraph I tried with version 30.0.0 on my Macbook, the issue still persists:
Here is "raw" input:

Same export configuration, I still see a large "border":

[alderg]

Please attach the drawio file.

[nhatkhangcs]

test.drawio

Hi @alderg here is the drawio file

[alderg]

Thanks for the file. I tested with 30.0.0 and the export works as expected here — the result is cropped to the size of the vertex box (51.5 × 23.45 as defined in the file). In earlier versions the crop used the size of the MathJax source code (the raw \(\mathcal{F}=\mathcal{Y}^\mathcal{X}\) text), which is significantly wider than the vertex box and produced a much bigger image with extra whitespace. The current behaviour matches what we do for non-math labels: the export bounds follow the cell geometry, not the source text.

Could you clarify what you're expecting to see? If the goal is for the export to grow to fit the rendered math, you'd want to enlarge the vertex (or use "Edit > Autosize" / Ctrl+Shift+Y) so the geometry matches the rendered size before exporting.

[nhatkhangcs]

That's kinda weird, because I'm using 30.0.0 as well:

Here is a new drawio file:

test.drawio

So we expect that after exporting to pdf with margin 5, it should look like this (the right border should be tight to the "region", which is the rectangle and the math):

But currently what I'm seeing is this:

So I don't know if the issue is from my side or the app itself...? Could you clarify how did you export the pdf? It might help.