Browser-based tools that never upload your files

Most online file tools work the same way: you upload your document, their server processes it, and it is deleted on a promise you cannot verify.

A small number do not. These run entirely in your browser using WebAssembly, so the file never leaves your machine — and most keep working with the network disconnected, which is the only version of that claim a user can check for themselves.

This list collects the ones I have found. Suggestions welcome.

Mohd Zubair
Mohd ZubairList by Mohd Zubair, last updated 
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  2. Photopea icon

    Photopea

     Like

    A full image editor in a browser tab. Files open from your disk and stay there.

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Online
    • Software as a Service (SaaS)
    Photopea screenshot 1
    Brush parameters.
    Editing text, many fonts available.
    +2
    Layer styles.
  3. Breeze PDF icon

    Breeze PDF

     Like

    PDF editor that works entirely offline in the browser. Nothing is uploaded.

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Online
    Breeze PDF screenshot 1
    Breeze PDF screenshot 1
  4. BentoPDF icon

    BentoPDF

     Like

    PDF toolkit that works fully offline with no sign-up. All processing happens locally in your browser.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    BentoPDF screenshot 1
    BentoPDF screenshot 1
    BentoPDF screenshot 2

Deliberately excluded: self-hosted tools like Stirling PDF. Running software on your own server is a different guarantee from running it in your own browser — both are good, but only one needs no server at all.

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