Free PDF Compare

    Renders both documents and compares them as images, page by page. Changed blocks are highlighted on a diff view. This is a visual diff, not a text diff: two files with identical words and different fonts, kerning or anti-aliasing will light up, which is usually what you want when checking a proof.

    • No uploadRuns on your device
    • No accountNothing to sign up for
    • No watermarkYour file, untouched
    • Works offlineDisconnect and try it

    More pdf tools

    Your files never leave your device

    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.

    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.

    Do my files get uploaded anywhere?

    No. This tool runs entirely in your browser using the Canvas and File APIs. The file you choose is read into memory on your own machine, processed there, and offered back as a download. Nothing is sent to a server, which is also why it keeps working with your network off.

    Is it actually free, or is there a catch?

    Actually free, with no account and no limit, because it costs nothing to run — the work happens on your device rather than on our hardware. That is different from generating with an AI model on Versely, which does cost credits; there is no free tier for generation.

    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.