NotChanged

Browser extension · Manifest V3

Prove PDFs at the point of download

When you download a statement from a real website, NotChanged records the hostname and file fingerprint, then saves a stamped -verified.pdf. Anyone can verify it later.

Chrome / Edge / Brave

v0.6.0 · Chrome 116+

Download for Chrome
  1. Unzip the file.
  2. Open chrome://extensions → Developer mode → Load unpacked.
  3. Optional: Details → Allow access to file URLs.

Firefox

v0.6.0 · Firefox 121+ · temporary add-on

Download for Firefox
  1. Unzip the file.
  2. Open about:debugging#/runtime/this-firefox.
  3. Load Temporary Add-on… → select manifest.json in the folder.

Temporary add-ons are removed when Firefox quits. Local file:// fallback after one-time download links expire isn’t available — prove from an https:// tab instead.

Open verify tool

Stamped verified PDF

Saves name-verified.pdf with a corner QR. Upload that file alone to verify — no sidecar needed.

Automatic on download

With auto-prove on (default), HTTPS PDF downloads are attested and stamped. Turn it off in the popup anytime.

Prove the PDF in this tab

For statements that open in the browser’s PDF viewer instead of downloading.

My Details (optional)

Name, email, phone, address in Settings. Attached to new proofs; email confirmed by link. Proofs work with none of these.