codetools.run is a collection of 47+ developer utility tools that run entirely in your browser. No signups, no server calls, no data leaves your machine. Format JSON, debug JWTs, test regex, generate UUIDs, convert timestamps, minify CSS/JS, encode Base64, generate QR codes, build CSS gradients, and much more. Every tool is free, fast, and privacy-first. Your data stays in your browser. Always. Built with Next.js, open to feedback. New tools added regularly.

AppSignal — Track your app’s health, errors and performance with ease

Track your app’s health, errors and performance with ease

Hey everyone! 👋 I built codetools.run because I was tired of jumping between different websites for simple dev tasks formatting JSON here, decoding Base64 there, testing regex somewhere else. Each one with popups, ads, and slow load times. So I built one place with 47+ tools that all run 100% in your browser. No accounts, no server calls, no tracking your data. Just open and use. Some highlights: - JSON Formatter, JWT Debugger, Regex Tester - Base64, URL Encoder, Hash Generator - CSS Gradient Builder, Flexbox/Grid Generators - Markdown Preview, SQL Formatter, and more Everything is free. Your data never leaves your machine. I'm actively adding new tools based on what developers actually need. Would love to hear which tools you'd want to see next!

AppSignal — Track your app’s health, errors and performance with ease

Track your app’s health, errors and performance with ease

codetools.run

Free developer tools that run entirely in your browser

Free developer tools that run entirely in your browser