Crypto Box

Encrypt and decrypt text with Web Crypto (AES-GCM) locally.

Interactive controls load with JavaScript. Processing stays in your browser—nothing is uploaded.

Učitavanje…

Kako koristiti

  1. Open Crypto Box — Load the tool.
  2. Enter text & password — Keep secrets off shared screens.
  3. Encrypt or decrypt — Run the selected action.
  4. Copy ciphertext — Store outputs safely.

Ograničenja

Requires JavaScript. Extremely large inputs may slow the browser tab. Results depend on your browser APIs; there is no server-side processing quota because nothing is uploaded.

When to use

When you want a quick, free utility without creating an account or sending content to an online converter.

When not to use

When you need server-side integration, batch automation at scale, or certified compliance tooling.

Privacy note

Tool inputs are processed in your browser only. Theme, language and favorites may use localStorage; hosting may keep standard access logs (IP, UA, URL) without tool payloads.

FAQ（5）

Algorithm?

AES-GCM via Web Crypto with a password-derived key (see on-page options).

Is this Signal/PGP?

No—convenient local encryption, not a full messaging suite.

Lost password?

Ciphertext cannot be recovered without the password.

Uploaded?

Never—keys and plaintext stay on-device.

Output format?

Typically Base64 JSON packing IV/ciphertext for easy copy.