Is it safe to compare a PDF online?

Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.

Are my files uploaded to a server?

No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.

Do I need to sign up or pay?

No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.

Can it compare PDFs of different page counts?

Yes — compare runs page-by-page up to the shorter document. Extra pages are ignored.

How sensitive is the visual diff?

It tints any pixel where the two renders differ by more than 10/255. Anti-aliasing differences and font hinting can show up — for textual changes, prefer the text-diff view.

Compare Two PDFs

Compare two versions of a PDF. Pixel-level visual diff highlights changed regions in red and blue; word-level text diff shows added and removed words per page.

Features

Side-by-side visual comparison with diff overlay
Word-level text diff per page
Switch between visual and text modes
Per-page navigation
Both files stay local

How to compare two pdfs

Drop the first PDF — Drag the original / version A.
Drop the second — On the Compare panel, drop version B.
Switch view — Visual diff for layout changes; text diff for word changes.

Frequently asked questions

Is it safe to compare a PDF online?: Yes — and ours is safer than most. Many free online tools quietly upload your files to their servers to do the work. We don't. Everything happens inside your browser on your own device, so your files never reach the internet. There's no upload step, no server copy, and no way for us (or anyone else) to see what you're working on.
Are my files uploaded to a server?: No. There's no server-side processing here. The whole tool is a tiny app that runs in your browser — we don't even have a server that could receive your files. You can confirm this by opening your browser's network tab while you use the tool: nothing leaves your device.
Do I need to sign up or pay?: No. There's no account, no email collection, no credit card. The tool is free to use as much as you want, on as many files as you want. We're supported by a few unobtrusive ads on the page — not by your data.
Can it compare PDFs of different page counts?: Yes — compare runs page-by-page up to the shorter document. Extra pages are ignored.
How sensitive is the visual diff?: It tints any pixel where the two renders differ by more than 10/255. Anti-aliasing differences and font hinting can show up — for textual changes, prefer the text-diff view.