This is a modern reimplementation of the idea and algorithm popularized by the Password Hasher Firefox extension by Wijo (and many others since). It allows users to generate unique, site-specific passwords from a single master password without storing any secrets.
This version is built as a Progressive Web App (PWA). You can install it to your device or use it directly in the browser. A bookmarklet is also provided for quick access. This makes it easy to use across different devices and platforms without needing to install a dedicated app or extension.
The code uses modern JavaScript Features including the Subtle Crypto API and the Clipboard API for secure password generation and copying. It needs to be run in a secure context (HTTPS or localhost).
You can use the version hosted at splitbrain.github.io/passhash/ or install it as a PWA from there.
Alternatively you can clone this repository copy the src/ folder to your own web server.