Compare PDF Files Online — Free and Private
Compare PDF files side by side with a synced viewer that highlights what changed between two versions. Add your two PDF files and get a visual side-by-side comparison — no upload, no signup, no watermark.
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What you can do with Compare PDFs
Synchronised scrolling of both documents
Flip between versions to spot edits
Nothing is uploaded, so drafts stay private
How to compare pdf files in 3 steps
Add both PDFs
Load the original and the revised file.
Scroll through the comparison
Pages move together so differences stand out.
Keep the evidence
Download either version if you need a copy.
Page order is usually the difference between a document that makes sense and one that does not — a scan split across a duplex feeder, an export with the cover in the middle, a print job that wastes paper. Compare PDFs rearranges the pages visually, so you confirm the result before you export instead of guessing at a page range syntax.
No upload
Your two PDF files are read locally with JavaScript and WebAssembly — for this tool, nothing is sent to a server.
No signup
No account, no email, no credit card, no trial to remember.
No watermark
What you download is the real file — clean, unmarked and print-ready.
Compare PDFs FAQ
What do I get back after using Compare PDFs?
You get a visual side-by-side comparison.
What does it cost?
Nothing. You get the full tool with no signup, no email and no watermark, and there is no limit on how many files you process.
Where are my files processed?
In your own browser tab. Nothing is uploaded to a server, so your files stay on your machine — close the tab and the data is gone.
Does it work on a phone, and can I use it offline?
Yes. The page works in any modern browser on desktop, tablet or phone, and once it has loaded it keeps working with no connection.
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