LocalFirstTools is a set of 28 free browser tools including a JSON formatter, JWT decoder, Base64, hash generator, UUID, timestamp, regex tester and diff checker. The site states there is no account, no ads and no usage limits, and that everything runs in the tab.
LocalFirstTools is a set of 28 free developer utilities that run entirely in your browser. Format and validate JSON, convert JSON to YAML, CSV, XML or TypeScript, view CSV files, format XML, SQL and HTML, decode JWTs, encode and decode Base64, URL and hex, generate SHA-256/MD5 hashes, UUID v4/v7 and passwords, convert Unix timestamps, test regexes, diff text and explain cron expressions. You paste or drop your data, your browser does the processing, and you copy the result. There is no upload endpoint, no account, no ads and no analytics event that carries your input. Each page has a 10-second check: open DevTools > Network, clear it, run the tool again and see no new requests. Loaded tools keep working offline. Built by Patrick, a developer in the Netherlands.