More free PDF tools
Same quality bar. Still free. Still no upload.
Your files never leave your device
Free to use, with no account, no usage limit and no watermark, because the work runs on your device rather than on our servers.
This is not a promise about how carefully we handle your upload. There is no upload. The file you choose is read into memory by your own browser, processed there, and handed back as a download — the tool has no server component and makes no network request with your data.
- Nothing is stored. We never receive the file, so there is no copy to retain, no retention period to disclose, and nothing to delete on request.
- Nothing is transmitted. No upload endpoint, no analytics payload carrying file contents, no third-party processor.
- You can verify it. Load this page, disconnect from the internet, and use the tool. It still works, because everything it needs is already on your machine.
- Nothing persists after you close the tab. Files are held in page memory only — not in local storage, not in a cache, not in a database.
A note on wording, because it matters: we do not describe these tools as “encrypted.” Encryption protects data that travels to somebody else's computer. Your file does not travel, so there is nothing to encrypt and nothing to intercept — which is a stronger guarantee than encryption, not a weaker one. The page itself is served over HTTPS like the rest of the site.
This makes the tools safe for material you are contractually barred from uploading to third-party services — client footage under NDA, unreleased campaign assets, anything covered by a confidentiality clause.
How it works
1. Drop two PDFs
The original first, then the revised version.
2. Compare pages
Each page pair is rendered and checked in small blocks; the threshold slider ignores tiny shifts.
3. Review the highlights
Changed areas are marked over a greyscale copy of the original, page by page.
Questions
The files look the same. Why does every page show as changed?
Re-saving a PDF re-rasterises fonts and recompresses images, so almost every pixel can shift by a value or two. Raise the tolerance until only the edits you care about remain, or compare two exports from the same tool rather than a native file against a reprint.
Does this compare the text layer?
No. It compares pixels. A word swapped for a synonym in the same position, in the same font, at the same size, can be invisible at a coarse tolerance. For a textual diff, extract both files to text first.
What if the two PDFs have a different number of pages?
Pages are matched by number, so page 5 is compared with page 5. A page that exists in only one file is marked as changed, and an inserted page shifts everything after it, so the later pages show as changed too.
Related tools
Stay in the same job cluster. Free tools stay on-device; paid tools are labelled as such.
These rearrange files. Versely makes new ones.
Everything on this page works on a file you already have, which is why it costs nothing. Generating something that did not exist (video from a prompt, a voice, a score) runs a model, and that costs credits.