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Your files stay on your device

PDF comparison tool

Compare the text of two PDFs page by page, see inserted, deleted, and changed words with context, an unchanged share score, and an HTML or CSV diff report.

This tool is in beta

Still being tested. If a result looks wrong, tell us.

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Drop a PDF to open the old .pdf

PDF files · Without a password · stays on your device

or paste

Old version

Drop a PDF to open the new .pdf

PDF files · Without a password · stays on your device

or paste

New version

Pick both PDFs to compare their wording.

The comparison aligns the two documents word by word over one continuous stream, so a paragraph that reflows across a page break does not show up as a change, and each change names the page it starts on. Only wording is compared: images, fonts, and layout are not. Word order follows pdf.js extraction, so multi-column pages read in that order, and a hyphenated line break counts as two pieces. The unchanged share is twice the matching words divided by the total words in both files. Tangled regions past the aligner's segment cap are shown as one block replaced instead of a false word-by-word story.

Compare options

Compared as soon as both files are picked

Up to 25.0 MB and 1,500 pages per file, 400,000 words per file. Locked (password-protected) PDFs are refused, and scanned PDFs need OCR first. Everything runs in this tab; nothing is uploaded.

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  • PDF to text
  • PDF inspector
  • Image metadata editor
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