What is LocalFirstTools?
- Developer Tools
- Free
- Launched week 42, 2026
LocalFirstTools is a set of 28 free developer utilities that run entirely in your browser: format and validate JSON, XML, SQL and HTML, view large CSV files, decode JWTs, encode Base64, generate SHA-256 hashes and UUID v7, convert timestamps and more. Processing happens in your tab, so there is no upload, no account and no ads. You can verify it in DevTools: the Network tab stays empty while you use a tool, and each build publishes SHA-256 checksums. Built by Patrick, a developer in the Netherlands.
LocalFirstTools alternatives
The developer tools listed here closest to LocalFirstTools, by shared categories and tags and by how alike the two descriptions read. Not a ranking against LocalFirstTools — open one and judge for yourself.
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