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Free Online PDF Tools — Merge, Compress, Convert & More

Got a new version of a contract, a notice or a paper and want to know what changed? Add the original PDF first, then the changed version. You get a report PDF: a first page that lists the changes, then every page of both files side by side, with removed words marked in red and added words in green.

The comparison happens inside your browser with pdf.js and pdf-lib, so your documents are never uploaded.

Frequently asked questions

Are pictures and layout compared too?

No. Only the text is compared. A changed picture, colour or font will not be reported, and the report says so.

Can I compare scanned PDFs?

A scanned page is a picture with no text to compare. Make both files searchable with OCR PDF first, then compare them.

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