Portable cryptographic seal
Prove a file or note hasn’t changed since you sealed it.
A fresh in-browser keypair signs your file or note into one portable record. No account, and nothing you seal is uploaded.
ML-DSA-65 + Ed25519 · SHA-256
or drop a file here
Proves your file is unchanged since you sealed it. Not that its contents are true.
Free·No account·Offline·You keep everything