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Brotli compression coming to PDF

March 2025 by Peter Wyatt, Robin Watts

In October 2023, the PDF Association launched a public request for stakeholder feedback on aspects of PDF that could be usefully updated.

We explored various subjects at that event, including HDR, new color capabilities, new font technology, animation, accessibility, new 2D and 3D graphical formats, and improved compression methods. Although several of these are under active development today in the PDF Association’s Imaging Model TWG, this article deals with a new method for optimizing PDF file size.

Brotli, a compression algorithm developed by Google engineers, was originally intended for web use, and is broadly adopted in web browsers. When implemented in PDF Brotli compression can offer significant reductions in file-size. Learn more!

When will AI understand document semantics?

March 2025 by PDF Association staff
PDF in the Wild


When will AI understand document semantics? | Will LLM-based OCR live up to the challenge? | Indicating whether the publisher allows PDF files to be mined by AI | JHOVE … Read more

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February 2025 by PDF Association staff
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PDF bookmarks from Google Chrome? | What does “PDF” mean to you? | Two reasons why everyone needs PDF | … Read more

PDF in the Wild

January 2025 by PDF Association staff
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Doom in a PDF | PDF Week Boston 2025 | The EAA is coming! | AI and accessibility standards | … Read more

PDF in the Wild

December 2024 by PDF Association staff
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A close-up look at how PDF does text | What would Patton think? | Word bug blocks PDF/UA validators, Happy … Read more

PDF in the Wild

November 2024 by PDF Association staff
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New guidance on PDF Portable Collections and on digitizing paper. | US Army website features PDF/UA | PDFism! | Scratch-and-sniff … Read more

PDF in the Wild

October 2024 by PDF Association staff
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In 2025 Europe will require ebooks to be accessible and include detailed accessibility metadata while Germany will require e-invoicing. | … Read more

PDF in the Wild

September 2024 by PDF Association staff
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File type for downloadable forms, in 3 letters | Mobile devices are pain-points for forms | But, Android support for … Read more

PDF in the Wild

August 2024 by PDF Association staff
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Devs must VALIDATE before applying ISO-standardized subset metadata to PDFs! | PDF Week Prague accommodations | OPF patches JHOVE | … Read more

PDF in the Wild

July 2024 by PDF Association staff
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Wired likes PDF/A, Google and Apple do PDF creation from phone cameras, EA-PDF is already in the wild, the latest … Read more

PDF in the Wild

June 2024 by PDF Association staff
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What do “first class companies” do? Japanese media covers the PDF Association in Tokyo. Firefox adds experimental alt. text generation … Read more

PDF in the Wild

May 2024 by PDF Association staff
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Microsoft deepens its investment in Tagged PDF. We talked PDF with NISO. Both Android and iOS improve PDF handling. A … Read more

PDF in the Wild

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