💻 Free Developer Tools

Web Developer Tools Online

14 free browser-based developer tools — JSON editor, regex tester, JWT decoder, SQL formatter, CSS generators, JS minifier, and more. Built for speed, no installs needed.

🛠️ 14 Dev Tools
⚡ Browser-Based
🔒 No Sign-Up
📱 Mobile Friendly

All 14 Developer Tools

Code Editor Cron Expression Builder CSS Box Shadow Generator CSS Unit Converter HTML Encoder HTML Table Generator JS & CSS Minifier JSON Editor JSON to TypeScript JWT Decoder Regex Tester SQL Editor SQL Formatter XML Formatter & Validator

Frequently Asked Questions

Are Toolzie developer tools completely free?
Yes — all developer tools on Toolzie are 100% free with no sign-up, no API key, and no rate limits. Open any tool and start using it immediately, right in your browser.
Is it safe to paste JWT tokens or sensitive code into these tools?
Toolzie developer tools process data in your browser — your input is not sent to any external server or logged. The JWT Decoder, for example, decodes the token entirely client-side using JavaScript, so your token never leaves your machine.
Can I use the JSON editor to validate and format JSON?
Yes. The JSON Editor lets you paste raw JSON, auto-format it with proper indentation, validate structure, and collapse or expand nested nodes for easy inspection — perfect for debugging API responses.
What is the Cron Expression Builder used for?
The Cron Expression Builder helps you visually construct cron schedule strings for task schedulers, CI/CD pipelines, and server automation. Select the frequency (minute, hour, day, month, weekday) and it generates the correct cron syntax instantly with a human-readable description.