Essential utilities for developers — format, validate, encode, and test.
Frequently Asked Questions
Do these tools work offline?
Most run entirely in your browser with no server calls, so they work as long as the page is loaded.
This collection of free developer tools handles the small, repetitive jobs that come up during coding and site management. Format and validate JSON or XML before it hits your app, test regular expressions against live input, and decode JWT tokens to inspect their claims. Shrink JavaScript and CSS for faster pages, generate UUIDs, convert Unix timestamps, and switch between Markdown and HTML when writing docs. There are also handy utilities for SEO work — meta tag, robots.txt, and XML sitemap generators — plus a UTM link builder and QR code generator for campaigns. Everything runs instantly in the browser with no sign-up.
The JSON Formatter & Validator is the daily driver for API developers debugging responses. The Regex Tester lets you build and debug patterns with live highlighting before they go into code, while the JWT Decoder reveals token payloads when troubleshooting authentication. Front-end developers use the JavaScript Minifier to trim file sizes before deployment, and the SQL formatter keeps long queries readable during reviews.
Back-end and front-end developers, QA testers, students learning to code, and SEO specialists all use these utilities. Privacy is built in: every tool runs entirely in your browser, so your code, tokens, and data are never uploaded to a server.