Compare two PDFs

This tool compares two versions of a PDF document and reports what was added, changed or deleted, with two reading modes: a word-by-word comparison for the text, and a pixel-by-pixel comparison for the layout. The differences are highlighted directly on the pages. Both files are processed in your browser, with nothing sent to a server.

How do I compare two versions of a PDF to see what changed?

Drop in both versions of the document: Vellum reports what was added, changed or deleted, with the differences highlighted directly on the pages.

Does the comparison work word by word, or is it purely visual?

Both modes are available: a word-by-word comparison to spot text changes, and a pixel-by-pixel comparison for layout differences.

Does comparing two PDFs upload both files to a server?

No, both documents are processed in your browser, with nothing sent to a server; the tool is free and unlimited.

Vellum — free PDF tools whose processing stays on your device.