Compare PDF — Free
See exactly what changed between two versions of a PDF. Upload both files and get a highlighted, word-by-word comparison in your browser.
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Compare two PDFs and see exactly what changed
Whether you're reviewing a contract redline or checking a revised report, the free Compare PDF tool reads both files and highlights every word that was added or removed between versions.
Private by design
Both documents are processed entirely in your browser — nothing is uploaded to a server.
Frequently Asked Questions About Compare PDF — Free
Is Compare PDF really free?
Yes. Upload two PDFs and see the differences highlighted, completely free — just a one-click sign-in to download.
What kind of changes does it detect?
It compares the text content of both PDFs word by word and highlights what was added or removed. It does not compare images, layout or formatting changes.
Is my document uploaded anywhere?
No — both PDFs are read and compared entirely in your browser and never leave your device.