For journalists, photographers & freelancers

Prove authorship of your digital work.

Cryptographically sign photos, videos, and documents — so editors and clients can verify they haven’t been altered.

Sign a file (free)How verification works
No uploads. Files never leave your device. Authena stores only a fingerprint + signature.

Built for professionals who cannot afford ambiguity.

Authena helps you prove what you delivered — before disputes happen.

Freelance journalists
Protect authorship and integrity of your reporting assets.
Photographers
Prove an image was not altered after submission.
Small editorial teams
Verify originals across handoffs and publishing workflows.

The problem

Digital work is easy to copy — and easy to manipulate.

Files get forwarded, re-uploaded, compressed, edited, or taken out of context. When something goes wrong, proving what you originally delivered is often impossible.

  • “This image was edited after submission.”
  • “This video didn’t come from you.”
  • “This document was modified.”

Authena gives you a verifiable original — based on cryptography, not opinions.

The solution

A cryptographic proof for your original work.

Sign your final file locally in your browser. Anyone can verify who signed it, when it was signed, and whether the file has changed since.

Authorship
Proof that this verification record was created by you.
Integrity
Upload the file to confirm it matches the signed fingerprint.
Shareable proof
A verification link you can send to editors and clients.
Sign a fileVerify a file

How it works

  1. Export your final file
    Photo, video, PDF, document — whatever you deliver.
  2. Sign it with Authena
    Signing happens locally in your browser. No upload required.
  3. Share the verification link
    Send it to editors, clients, or publishers.
  4. Verification
    They can check provenance by link, or upload the file to confirm integrity. Even tiny edits will fail verification.
Important: Authena is not an “AI detector”. It’s proof of authorship and file integrity.

Get early access

We’re onboarding freelancers and small teams. Join the waitlist:

FAQ

Do you upload or store my files?
No. Files never leave your device. Authena stores only a fingerprint and signature.

What if the file is edited later?
Integrity verification will fail — even tiny edits change the fingerprint.

Is this legally binding?
Authena provides cryptographic proof of authorship and integrity. Legal interpretation depends on context.

Can anyone verify?
Yes. Verification does not require an account.

Sign a file (free)Verify a file