Integrity Check & Proof of existence
CREATE a unique digital fingerprint of any filein about 5 seconds — directly in your browser.ThenPROVE a file existed in this exact state — with decentralized proof on 
Casper Network.
And VERIFY it remains unchanged.
Proofisy makes file integrity simple:no sign-up required,
no upload,
no cloud processing,
and no file analysis.Your files stay on your device.
How Proofisy works
Simple by design
Create a fingerprint
Proofisy creates a unique SHA-256 digital fingerprint of your file and stores it in a verifiable certificate.
Add proof of existence
With DePEx, you can optionally register that fingerprint on Casper Network without ever uploading the original file.
Verify later
At any time, compare the file with its certificate to confirm that it remains exactly unchanged — minutes, months, or years later.
Privacy First
All fingerprint generation and verification are performed locally in your browser.
Instant Verification
Verify the integrity of documents, images, archives and videos in just a few seconds.
Any File Type
ZIP archives, PDFs, photos, videos, contracts or any other digital files.
New Proofisy feature
DePEx — Decentralized Proof of Existence
Prove that your file existed at a specific point in time.
With the DePEx feature, Proofisy can register your file's SHA-256 digital fingerprint on Casper Network.
Your original file never leaves your device — only its digital fingerprint is registered on the blockchain.
🔒 Your file stays private
Only its SHA-256 fingerprint is registered.
⛓️ Blockchain proof
Your proof is anchored on
Casper Network.
📜 Enriched certificate
Blockchain proof details are included in your Proofisy certificate.
DePEx is built directly into Proofisy. Simply switch DePEx ON before selecting your file.
Ready to build trust in your files?
Start generating integrity certificates for your files directly in your browser.
Open ProofisyThink Proofisy could help someone you know?
Send them a quick email and help them discover it in a couple of minutes.