Desktop App

Download Mysterion.

Sign and verify content from your desktop. Every release is published with a verifiable SHA-256 hash — because a provenance tool should prove its own provenance.

New to Mysterion? See how it works ↓

Windows

Checking latest release…

Download

Linux

Checking latest release…

Download

macOS

In development

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Verify your download The download is a .zip containing the versioned installer. After downloading, confirm the archive's hash matches the SHA-256 shown above:

sha256sum mysterion-app.zip  (Linux)
certutil -hashfile mysterion-app.zip SHA256  (Windows)
Browser Extensions

Verify on the web, in your browser

Check any signed image, video, or PDF right where you find it — no upload, no account. Content never leaves your device.

Firefox

Signed by Mozilla · v05.06.016

Add to Firefox

Chrome

Coming soon

Coming soon

Safari

Notarized by Apple · v05.06.016 · macOS

Download for Safari

Unzip, move to Applications, then enable in Safari › Settings › Extensions.

Getting Started

Sign once. Verify anywhere.

Two things Mysterion does: creators sign their work in the desktop app, and anyone can verify it — on the web, in the browser, or in the app. Verification is always free, and content never leaves your device.

Signing — in the desktop app

  1. 1
    Open the app and choose what you're signing. Pick Sign Image, Sign PDF, or Sign Video from the sidebar.
  2. 2
    Select your file. Choose an image, PDF, or video. Mysterion embeds an invisible, tamper-evident marker and binds it cryptographically to your identity.
  3. 3
    Get a signed copy — your original is untouched. A signed copy is saved alongside your original, in the same folder. Mysterion never overwrites or modifies the file you started with.
  4. 4
    Share the signed file. It looks identical, but now carries a verifiable signal of origin and integrity that survives re-encoding, resizing, and format changes.

Verifying — extension or web

  1. 1
    Take it for a test drive. Head to the Live Demo page — it's loaded with real signed images, video, and PDFs. With the extension installed, right-click any of them and choose “Verify with Mysterion” to watch the verdict appear. The best way to see it work before you rely on it.
  2. 2
    Then use it anywhere. Right-click signed content on any site — same menu, same instant verdict.
  3. 3
    No extension? Use the web bar. On that same Live Demo page, paste a file's URL into the verifier bar for an instant check — no install, no account.
  4. 4
    In the app. Use Verify Image / PDF / Video for a full check, including page-level detail on PDFs. Encrypted PDFs will prompt for a password.

What the verdicts mean

Hover or tap a verdict to see what it means.

Verified
Verified Origin · Content Altered
Unverified Match
Synthetic Declared
Unknown Origin