Compare PDF
See what changed between two PDFs.
Free · runs in your browser
Use Compare PDF online to spot what moved, changed, or disappeared between two versions of a document. Add both PDFs and get a marked-up copy with every visual difference highlighted, page by page.
How to compare pdf
- Add the original PDF. Drag the first version onto the Original drop zone, or click to browse for it.
- Add the changed PDF. Drop the second version onto the Changed drop zone.
- Compare and download. Every page is rendered and checked pixel by pixel, and the differences are highlighted in red on a marked-up PDF you can download or view online.
Frequently asked questions
Is Compare PDF free?
Yes. Compare PDF is completely free to use, with no sign-up, no watermarks, and no limits on how often you use it.
Is it safe to use Compare PDF?
Yes. Compare PDF runs entirely in your browser, so your PDF is processed on your own device and isn’t uploaded to a server.
Do I need to install anything or create an account?
No. Compare PDF works in any modern web browser — there’s nothing to download and no account required.
What files can I use with Compare PDF?
Compare PDF accepts PDFs. Files up to 100 MB are supported.