c2pa-verifier 0.2.3 · demo

Check the Content Credentials of an image

Pure PHP, running in your browser through WebAssembly. Your file never leaves your device. The verdict means what c2patool's means.

Your file

Drop an image here or choose a file

JPEG, PNG, WebP, MP4, MOV, AVIF, HEIC · up to 50 MB

Loading PHP…

Or try a sample

Trust list

NoneThe signature is checked, but no signer is trusted. c2patool's test rootsThe public test certificates from contentauth/c2patool. For demonstration only. Google's Pixel camera CAsThe two intermediate CAs that sign Pixel photos and their timestamps. The file does not carry Google's root, so these two serve as anchors.

Ed25519 signatures cannot be checked in the browser build (no sodium); they show as algorithm.unsupported.
Revocation is never fetched: no network during verification.

Choose a sample or drop a file.

Use it on your own server: composer require provemark/c2pa-verifier PHP 8.3+, ext-openssl, no binary, no extension beyond the standard ones.

PHP runs through php-wasm 3.1.55 (GPL-2.0-or-later). Sources and licences: NOTICES.md.