Compare PDFs
See exactly what changed between two versions.
Document A
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Document B
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Comparer des PDF — frequently asked questions
How is the difference percentage calculated?+
Each matching page pair is rendered as an image, and we count the percentage of pixels whose color differs beyond a small threshold — small enough to ignore anti-aliasing noise but sensitive to real content changes.
What if the two PDFs have a different number of pages?+
Pages that only exist in one document are flagged as 'Only in Document A' or 'Only in Document B' rather than compared against nothing.
Do you upload my files to a server?+
No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The AI tools that used to send extracted text to a server are currently disabled.
Is there a file size limit?+
There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.
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