Free, privacy-first developer tools that run entirely in your browser. No data is ever sent to a server.
Browse 600 utilities spanning JSON processing, encoding and decoding, cryptography, regex testing, API debugging, DevOps configuration, CSS design generators, and more. Every tool loads instantly, works offline after the first visit, and processes your data entirely on-device using Web Crypto API and modern JavaScript — nothing is ever uploaded to a remote server. Bookmark the ones you use most and they will appear in your recently used bar across the site.
