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cadenas (French for "padlock") encrypts and decrypts a file with a password, right in your browser. No file and no password is ever sent over the Internet: the page is technically not allowed to open any network connection (Content Security Policy connect-src 'none'), and it works offline once installed.
It uses Argon2id and XChaCha20-Poly1305, detects any change to an encrypted file, and can read and write the age format, so files stay readable with other tools. The same tool comes as a command line for Windows, macOS and Linux, a Docker image you can self-host, and a JavaScript library.
cadenas is free software (MIT) with a documented file format. It has not had an independent security audit yet; the threat model and format are public for review.
Project Samples
