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Skip to contentSeal notes with libsodium secretbox and Argon2id.
Full tool — runs in your browser. No sign-up required.
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Seal notes with libsodium secretbox and Argon2id.
Developer utilities should be fast, copy-friendly, and predictable. Paste or drop input, get a reliable result — no CLI install required.
Use this free Encrypted Notes whenever you need a browser-local result without creating an account.
Open the Encrypted Notes page — no registration required.
Paste, upload, or configure your input.
Review the live result and adjust options.
Copy or download the output to your device.
Processing is designed to stay in your browser session unless a mode explicitly notes a network call.
LocalThis tool processes data locally in your browser. Tentaco does not receive your file contents for this mode.
Seal notes with libsodium secretbox and Argon2id. Open the tool in your browser — no account or install required.
Yes — runs locally in your browser.
No — processing runs locally in your browser. Your files and inputs do not leave your device unless the tool explicitly uses the network.
Recovery Key Generator online — free
Generate printable vault recovery keys in your browser — offline-friendly strings for backup and emergency access.
Secret Sharing online — free
Split and restore secrets with Shamir threshold shares.
WebAuthn Test online — free
Register and assert a passkey in this browser (demo).
Passkey Inspector online — free
Decode WebAuthn clientDataJSON and authenticatorData locally.
Base58 Encoder online — free in your browser
Encode and decode Base58 (Bitcoin alphabet). Tentaco Base58 Encoder: review input and get an instant result — free, no sign-up.
File Timestamps online — free
Hash files and stamp them via OpenTimestamps calendars.
Bcrypt Hash — dev password hashing
Generate bcrypt password hashes locally. Tentaco Bcrypt Hash: review input and get an instant result — free, no sign-up.
Certificate Inspector online — free
Inspect PEM X.509 certificates and fingerprints.