Blog
What we find when we open real documents
The a11yfy technical blog. Every number here comes from a measurement we ran ourselves, on real files, in a way you can check. We show what the accessibility standards actually require, where people most often trip up, and what good practice looks like. PDF-focused, but not only about PDFs.
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An untagged PDF isn't unreadable. It's read in an order nobody chose.
Screen readers don't refuse an untagged PDF — they guess at a reading order. We measured what that guess produces in a real public-sector PDF, using the same reading-order options Adobe, JAWS and NVDA document for assistive technology.
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A tagged PDF isn't the same as an accessible one. Here's what's inside the tags.
What a PDF's tags actually contain, shown inside a real structure tree — and why a file can pass thousands of checks and still fail PDF/UA-1.