Protect a Document

Create a tamper-proof seal. If anyone changes even one byte, you'll know.

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Click to select a file
Any file type. Your document never leaves this server.

Notis creates a mathematical fingerprint of your document using three independent algorithms. If anyone changes even a single character, the fingerprint won't match. The seal is signed with your private key so it can't be forged.

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SHA-512
NIST standard hash
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SHA-3-512
Independent algorithm
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BLAKE3
Parallel verification