# LocalFirstTools

> 28 developer tools that never upload your data

- Website: https://localfirsttools.com
- AZN8 listing: https://azn8.com/listing/localfirsttools
- Pricing: Free — no account, no ads · Free
- Categories: [Developer tools](https://azn8.com/category/developer-tools), [Productivity](https://azn8.com/category/productivity)
- Listed: 2026-10-13
- Updated: 2026-10-13
- JSON: https://azn8.com/api/v1/listings/localfirsttools

## 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

[Try free](https://localfirsttools.com)