Hat.sh is a web app that provides secure local file encryption in the browser. It's fast, secure, and uses modern cryptographic algorithms with chunked AEAD stream encryption/decryption.

### Features

#### Security

- XChaCha20-Poly1305 - for symmetric encryption.
- Argon2id - for password-based key derivation.
- X25519 - for key exchange.

#### Privacy

- The app runs locally in your browser.
- No data is ever collected or sent to anyone.​

#### Functionality

- Secure multiple file encryption/decryption with passwords or keys.
- Secure random password generation.
- Asymmetric key pair generation.
- Authenticated key exchange.
- Password strength estimation.