feature: cross-format pdf-standard selection
#13857
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mcanouil
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Jan 8, 2026
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Following our meeting discussion, related issues on pdf accessibility |
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New `pdf-standard` option for LaTeX and Typst PDF output that supports: - PDF versions: 1.4, 1.5, 1.6, 1.7, 2.0 - PDF/A standards: a-1b, a-2a, a-2b, a-2u, a-3a, a-3b, a-3u, a-4, a-4f - PDF/UA standards: ua-1, ua-2 (LaTeX only) - PDF/X standards: x-4, x-4p, x-5g, x-5n, x-5pg, x-6, x-6n, x-6p (LaTeX only) Standards can be combined, e.g., `pdf-standard: [a-2b, ua-1]` for accessible archival PDF. Uses LaTeX's \DocumentMetadata API with `tagging=on` for tagged PDF support. Auto-installs required LaTeX packages (latex-lab, colorprofiles) when missing. Closes #4426 Closes #13782 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Preserve markdown image captions and fig-alt attributes as alt text
for \includegraphics[alt={...}] in LaTeX output. This enables PDF/UA
compliance by ensuring alt text is embedded in the PDF.
The fix preserves image captions as the alt attribute before clearing
them for figure handling. Also propagates fig-alt from FloatRefTarget
to Image elements for LaTeX output.
Closes #13248
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Clarification: LaTeX does not do compliance validation; that's why it only produces warnings. We'd have to integrate something like veraPDF to actually validate LaTeX PDFs. Compliance validation is integrated for Typst. |
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To be merged after #13249
Fixes #4426
Also includes a fix for #13248 in a separate commit for alt text from captions for PDF images not being passed through to Pandoc. The Typst side is more complicated since Pandoc does not support this yet.
Adds basic support in Typst and LaTeX for PDF standard selection.
PDF versions and standards can be independently specified, so this takes a list. Version specifies the output format; standard specified what validation is applied to the output.
Here are the rules: you can combine standards from different families:
The constraint is you can only have one from each category:
It would be equally valid to take
pdf-versionandpdf-standardas separate options, as LaTeX does, but I chose to follow Typst here and use one option for both.Once the options have been validated, these go to the command line
--pdf-standardfor Typst, new\DocumentMetadata{}command for PDF.The metadata includes
tagging=onfor any standard in LaTeX.Auto-installs required LaTeX packages (latex-lab, colorprofiles) when missing.
This includes a test which will fail UA-1 in Typst and warn in LaTeX; these warnings are surfaced from the LaTeX log.