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How to Compare Two PDFs Online (Free)

Need to spot what changed between two versions of a contract, invoice, or report? PdfWord's free PDF compare renders every page pair and highlights differences in red — the only free visual PDF diff that runs 100% in your browser.

Steps

  1. Upload the original PDF and the revised PDF
  2. Click Compare PDFs — every page pair is pixel-compared
  3. Review red highlights + similarity scores, download the diff report

Use the Free PDF Compare Tool →

Frequently Asked Questions

What counts as a difference?

Any visible change — edited text, moved images, stamps, signatures. Print noise is ignored.

Is it really free?

Yes — no signup, no watermark, no upload. Your documents never leave your device.

What if page counts differ?

The tool compares the pages both PDFs share and tells you about the mismatch.