Download

All tools / PDF to PDF/UA

PDF to PDF/UA

Prepare a tagged, accessible PDF/UA-1 copy with semantic structure, language and XMP metadata.

Drop a PDF here

100% free, no sign-up, and the file stays on your device.

How to Prepare a PDF/UA Accessible Copy

  1. Choose an unlocked PDF and inspect the 8-point PDF/UA-1 accessibility audit.
  2. Set the accessible document title, primary BCP-47 language tag and fallback figure description.
  3. Prepare the tagged PDF/UA-1 copy and download it after reviewing.

Related Tools

Searchable PDFPDF to PDF/AEdit or Remove MetadataPDF to Markdown

What Happens to Your File

OxnaPDF inspects your document in browser memory against eight machine-verifiable ISO 14289-1 (PDF/UA-1) checks: XMP pdfuaid:part=1 identification, /MarkInfo /Marked true, /StructTreeRoot semantic tag tree, /ParentTree marked-content index, Document /Title, /ViewerPreferences /DisplayDocTitle true, primary /Lang tag, and page /Tabs /S structure tab order.

For untagged text PDFs, the local engine wraps page text blocks and image XObjects in marked-content sequences (BDC/EMC) and builds a semantic structure tree (/Document, /Sect, /H1, /H2, /P and /Figure with /Alt descriptions). For already-tagged PDFs, it preserves your existing tag tree while repairing missing /RoleMap entries, missing figure /Alt descriptions, table header /Scope attributes and required catalog/XMP metadata.

Limits

  • Accepts unencrypted, unsigned PDFs up to 100 MB; password-protected, digitally signed and dynamic XFA form PDFs are refused.
  • Image-only scanned PDFs with no selectable text cannot be auto-tagged directly; run Searchable PDF (OCR) first to add a text layer.
  • Prepares machine-verifiable PDF/UA-1 structure and metadata; human review is still recommended to verify complex multi-column reading order, colour contrast and descriptive figure alt text.

Good to Know

  • Unlike visual PDF/A-2b archiving (which rasterises pages into images), PDF/UA-1 preserves selectable text, bookmarks, links, form fields and semantic tags so screen readers can navigate the document.
  • Every page is updated with /Tabs /S so keyboard Tab focus follows the semantic structure tree rather than raw page coordinates.
  • If your PDF is a camera scan or photocopy, run Searchable PDF (OCR) first, then open the searchable copy in PDF to PDF/UA.

Questions

What Is PDF/UA (ISO 14289-1)?
PDF/UA stands for Universal Accessibility, the international ISO standard for tagged, accessible PDFs that work reliably with screen readers, braille displays and keyboard navigation.
How Does PDF to PDF/UA Differ From PDF to PDF/A?
PDF/UA preserves selectable text and adds semantic structure tags for assistive technology, whereas OxnaPDF's PDF/A-2b tool creates an image-only visual archival copy.
Can It Auto-Tag an Untagged PDF?
Yes, if the PDF contains selectable text, the engine automatically groups text blocks and images into headings, paragraphs and figures inside a valid /StructTreeRoot.
What If My PDF Is a Scanned Image?
Run Searchable PDF (OCR) first so your pages have selectable text, then run PDF to PDF/UA to tag the recognised text.
Does Preparing a PDF/UA Copy Upload My Document?
No, all structure inspection, auto-tagging and XMP metadata writing happen locally inside your browser.