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If your Django PDF-generation traceback shows ReportLab trying to open a temporary .ttf file and failing with “Cannot open resource,” check whether the file still exists when rendering reaches the font. In one reported Windows case using xhtml2pdf and ReportLab, the suggested cause was that the temporary font file had been deleted too early. That is a case-specific explanation, not a diagnosis for every TTFError.
First confirm that this is the same error
This fix is relevant when your application uses Django with xhtml2pdf and ReportLab, and the traceback fails while opening a temporary TTF font resource. Match the details in the traceback rather than relying on the error label alone:
- Does the failure occur during PDF rendering or font loading?
- Does the traceback include ReportLab and a temporary-directory path ending in a
.ttffile? - Does it also report “Cannot open resource” or “Can’t open file”?
A similar-looking error elsewhere may have a different cause. The reported example used a Windows path, so do not assume its temporary-file behavior applies unchanged to another operating system or library setup.
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Verify the CSS font URL
Inspect the @font-face rule used by the PDF and determine what resource its URL actually identifies. In the reported example, CSS declared a font and the traceback later showed ReportLab attempting to open a TTF under the Windows temporary directory. Check that the URL resolves to the intended font, and that the process generating the PDF can read it.
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Check whether the font is temporary
If the font is copied, extracted, or otherwise staged in a temporary location, verify that it remains present through the point when ReportLab opens it. The community answer for the matching case attributed the failure to Windows deleting the temporary file before rendering used it. Confirm that explanation in your own application by checking the file path and its existence at the time of the failure; do not treat it as established merely because the path contains a temporary directory.
Record the installed versions
Note the versions of xhtml2pdf and ReportLab in the failing environment before adopting a workaround. The reported advice does not establish that the relevant API or monkey-patch is officially supported in current releases. Check the documentation and issue history for the versions you actually run.
Workaround 1: change how the named resource is reopened
For the reported temporary-resource case, a community answer suggests assigning pisaFileObject.getNamedFile so it returns the resource URI, before PDF creation:
pisaFileObject.getNamedFile = lambda self: self.uriThis is not a universal drop-in fix. It assumes you have the relevant pisaFileObject available and that its uri identifies a resource ReportLab can still read. Apply it only where that object exists in your code path, and verify the behavior against your installed xhtml2pdf version. The available report does not establish compatibility across versions or explain how to obtain that object in every application.
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- Reproduce the failure and identify the font resource object involved.
- Check that its URI points to the intended font and that the renderer can access it.
- Apply the override before PDF creation, as in the reported suggestion.
- Render the same PDF again and confirm that the font loads and the output is correct.
If the font still cannot be read, remove the override and investigate the path or file lifetime instead of assuming the patch is supported or appropriate.
Workaround 2: resolve Django static or media URLs to a stable path
If the TTF is an application static or media asset, a different community example uses xhtml2pdf’s link_callback to map the resource URL to a filesystem path. Its described pattern is to resolve the Django URL, check that the resulting path exists, and have the named file object return that path. This approach addresses a different setup from a transient font resource: the font is supplied by the project and should resolve to a real asset path.
Rank #4
Use the callback pattern only after confirming that your CSS font URL is a Django static or media URL and that your installed xhtml2pdf version supports the callback behavior you intend to use. The reported example is not enough to guarantee that a particular callback implementation will work in every Django project, deployment layout, or library version. In particular, verify that the resolved path is the actual font file and is readable by the PDF-rendering process.
Choose based on where the font comes from
| Font situation | Reported approach | What to verify |
|---|---|---|
| Font resource is temporary and fails when reopened | Override getNamedFile to return self.uri. |
The URI remains valid and readable at render time, and the installed API supports the change. |
| Font is a Django static or media asset | Use link_callback to resolve the URL to a filesystem path. |
The callback resolves to the intended existing font file, and your installed xhtml2pdf version supports the behavior. |
The community reports do not compare success rates or show that one approach is more reliable. Select the one that matches your resource source; do not combine them without a reason.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot if the error remains
- The font path does not resolve: Check the URL in
@font-face, then confirm that it maps to the expected file rather than a different directory or resource. - The resolved path is missing: For a static/media font, inspect the callback’s final filesystem path and verify that the file exists where the PDF process runs.
- The file exists but cannot be opened: Check that the rendering process has permission to read it, and that the font remains available through the render operation.
- The temporary-file override has no effect: Confirm that the failing object is the one being changed and that the assignment runs before PDF creation. Verify the object’s URI and check version-specific API behavior.
- The traceback differs from the reported pattern: Do not assume early deletion is the cause. Follow the full traceback to the failing resource and investigate that path instead.
After any change, test the resulting PDF as well as whether the exception disappeared: a successful render alone does not establish that the intended font was embedded or displayed as expected.
Or skip the browser setup
ScreenshotNeo is a website screenshot API, not a Django PDF renderer, and it will not fix a TTFError or generate this PDF. If your separate task is capturing a webpage, one GET request can return an image or PDF; see the ScreenshotNeo API documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpFor webpage captures, ScreenshotNeo accepts cookie or consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before the shot; each step can be turned off. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, with the outcome identified in response headers. Its MCP server provides screenshot and PDF-capture tools for AI agents. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots.
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