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LocalFirstTools

28 developer tools that never upload your data

Free — no account, no adsFree

Try free
LocalFirstTools website

About

LocalFirstTools is a set of 28 free developer utilities that run entirely in your browser. Format and validate JSON, XML, SQL and HTML; convert JSON to YAML, CSV or XML; decode JWTs; encode Base64; generate hashes, UUIDs and passwords; convert Unix timestamps; test regexes; diff text; view CSV; explain cron. Everything runs in your tab: no upload, no account, no ads. Verify it in DevTools Network. Built by Patrick in the Netherlands. Proprietary (not open source); each build publishes SHA-256 checksums.

Features

  • 28 browser-only developer tools
  • Nothing is uploaded — verify in DevTools
  • JSON, JWT, Base64, hash, UUID, CSV, XML, SQL, HTML
  • No account, no ads
  • Works offline after the tool loads

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