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PDF/A and external references

November 2025 by Peter Wyatt

PDF/A ensures reliable long-term rendering by embedding fonts, images, and color profiles, but URLs can still appear in text, hyperlinks, bookmarks, annotations, metadata, and embedded files.

Link annotations and URI Actions define clickable destinations, but PDF/A restricts certain action types to prevent external dependencies.

Guided by clear policies, comprehensive audits of both visible and hidden references help maintain authenticity, accessibility, and long-term integrity of PDF/A documents and digital collections.

PDF/A ensures reliable long-term rendering by embedding fonts, images, and color profiles, but URLs can still appear in text, hyperlinks, bookmarks, annotations, metadata, and embedded files.

Link annotations and URI Actions define clickable destinations, but PDF/A restricts certain action types to prevent external dependencies.

Guided by clear policies, comprehensive audits of both visible and hidden references help maintain authenticity, accessibility, and long-term integrity of PDF/A documents and digital collections.

PDF Days Europe: Monday Keynote, Posters and more!

May 2025 by PDF Association staff
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Announcing the Monday keynote speaker for PDF Days Europe 2025, the new poster sessions and Peter Wyatt’s PDF Workshop!

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May 2025 by PDF Association staff
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Submit a Technical Poster to showcase your ideas at PDF Days Europe 2025!

For members only

May 2025 by PDF Association staff
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Accessibility | veraPDF version 1.28.1 | Chrome PDF features updates | Transparency blending | Screen readers and special characters | … Read more

PDF in the Wild

April 2025 by PDF Association staff
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Members gather for PDF Week Boston 2025 in Concord, Massachusetts! Besides sightseeing and socializing there is also some work getting … Read more

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April 2025 by Duff Johnson
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What does it take to build the organizational skills and resources necessary to succeed in ensuring PDF documents are accessible?

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April 2025 by PDF Association staff
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The PDF Accessibility LWG’s 2025-Q2 release focuses on headings, with 9 new techniques and 8 new failure examples.

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April 2025 by PDF Association staff
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AI’s Pirated-Books Problem | Correcting US financial regulations referencing PDF | New crawl limit improves CC’s capture of PDF | … Read more

PDF in the Wild

March 2025 by Robin Watts (Artifex Software Inc)
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Brotli compression is coming soon to PDF 2.0, enabling smaller file sizes. Sample PDF files are available to kickstart development!

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March 2025 by PDF Association staff
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When will AI understand document semantics? | Will LLM-based OCR live up to the challenge? | Indicating whether the publisher … Read more

PDF in the Wild

March 2025 by Erin Dempsey (TWAIN Working Group)
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This article explores how ISVs can use PDF/R to improve imaging application software’s efficiency, reduce development complexity, and enhance customer … Read more

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March 2025 by PDF Association staff
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The PDF Association will host a trio of PDF technology events in Berlin from September 11-19. Save the date… and … Read more

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