I have searched the existing issues and discussions.
Problem Description
I’m unable to render PDFs inline within OpenWebUI.
Using
Originally created by @agoston-huszka-wespeakai on GitHub (Aug 29, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/17044
### Check Existing Issues
- [x] I have searched the existing issues and discussions.
### Problem Description
I’m unable to render PDFs inline within OpenWebUI.
Using <object>:
<object data="/static/exports/pdfs/example.pdf" type="application/pdf" width="800" height="600"></object>
Error:
Failed to load '<base_path>/static/exports/pdfs/example.pdf' as a plugin, because the frame into which the plugin is loading is sandboxed.
Using <iframe>:
<iframe src="/static/exports/pdfs/example.pdf" width="100%" height="600px"></iframe>
Error:
This page has been blocked by Chrome
The file is accessible directly if I open /static/exports/pdfs/example.pdf in a new tab, so the PDF itself is fine — it just cannot be embedded in the UI.
### Desired Solution you'd like
I’d like to be able to display PDFs inline in the artifacts/preview panel, either via <object> or <iframe>.
Possible approaches:
Adjusting the sandbox attributes on the iframe to allow PDF plugins.
Ensuring headers like X-Frame-Options or Content-Security-Policy aren’t blocking inline PDF rendering.
(Alternatively) providing an OpenWebUI-native way to embed PDFs (similar to SVG rendering).
### Alternatives Considered
_No response_
### Additional Context
_No response_
@agoston-huszka-wespeakai commented on GitHub (Aug 29, 2025):
Thanks, I checked the suggested settings and both
iframe Sandbox Allow Same Origin
iframe Sandbox Allow Forms
are set to ON, but the issue remains the same — the PDF is still not rendering inside
<!-- gh-comment-id:3237706497 -->
@agoston-huszka-wespeakai commented on GitHub (Aug 29, 2025):
Thanks, I checked the suggested settings and both
iframe Sandbox Allow Same Origin
iframe Sandbox Allow Forms
are set to ON, but the issue remains the same — the PDF is still not rendering inside <iframe> or <object>
<!-- gh-comment-id:3237785865 -->
@rgaricano commented on GitHub (Aug 29, 2025):
I had some changes on my end regarding iframe rendering, I'll PR them briefly.
Right now, if you want to make it work with a quick fix:
Replace
https://github.com/open-webui/open-webui/blob/2407d9b905978d68619bdce4021e424046ec8df9/src/lib/components/chat/Messages/Markdown/HTMLToken.svelte#L81
by
```
sandbox="allow-scripts allow-downloads{($settings?.iframeSandboxAllowForms ?? false)
? ' allow-forms'
: ''}{($settings?.iframeSandboxAllowSameOrigin ?? false) ? ' allow-same-origin' : ''}"
```
and rebuild
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Originally created by @agoston-huszka-wespeakai on GitHub (Aug 29, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/17044
Check Existing Issues
Problem Description
I’m unable to render PDFs inline within OpenWebUI.
Using
@rgaricano commented on GitHub (Aug 29, 2025):
userSettings/Interface/Artifacts - Check iframe sandbox options
@agoston-huszka-wespeakai commented on GitHub (Aug 29, 2025):
Thanks, I checked the suggested settings and both
iframe Sandbox Allow Same Origin
iframe Sandbox Allow Forms
are set to ON, but the issue remains the same — the PDF is still not rendering inside
@rgaricano commented on GitHub (Aug 29, 2025):
I had some changes on my end regarding iframe rendering, I'll PR them briefly.
Right now, if you want to make it work with a quick fix:
Replace
https://github.com/open-webui/open-webui/blob/2407d9b905978d68619bdce4021e424046ec8df9/src/lib/components/chat/Messages/Markdown/HTMLToken.svelte#L81
by
and rebuild
@tjbck commented on GitHub (Aug 31, 2025):
Intended behaviour due to security issue, we'll explore ways to display pdfs natively.