Document Certification
Certify any document. Without ever uploading it.
unftProof turns any file into permanent, verifiable proof — created entirely on your device, so your documents stay private from start to finish.
- Stays on your device
- Nothing uploaded, ever
- Works with any file
Certify a document
Create verifiable proof in seconds. It's free, and you don't need an account to get started.
Shown only on your certificate PDF, for your own reference — never part of the fingerprint or the blockchain record.
0/240Drop a document here
or browse from your device
It never leaves your device.
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Reading your file locally…
Data sent to our servers: 0 bytes
Proof Data Cryptographically verifiable
View technical details
- Algorithm
- SHA-256
- Bytes processed
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- Content hash
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- Filename binding hash
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- Data sent during local processing
- 0 bytes
- Status
- Not registered on-chain
View data sent for certification
Only these hashes and the protocol version are sent. The file and filename remain on this device.
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User Note Informational only — not part of the proof
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Appears on your certificate PDF for human reference only. It is never included in the digital fingerprint, the blockchain transaction, or proof verification.
See it for yourself
Turn off your Wi-Fi and try it — your document is still processed instantly. An internet connection is only needed if you choose to register your proof on the blockchain.
How it works
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1
Select your document
It's read directly in your browser — never uploaded, never stored.
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2
We create your proof
A unique digital proof is generated instantly, tied only to your file's exact content.
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3
Make it official
Register your proof on the blockchain for a permanent record — your file itself is never shared.