50+ Free Developer Tools — No Install, No Signup, Runs in Browser
Teamz LabI built a collection of browser-based developer tools that need zero installation. No npm, no Docker, no extensions — just open and use.
Here are the ones developers actually keep coming back to:
Code Formatting & Conversion
- [JSON Formatter & Validator](https://tool.teamzlab.com/dev/json-formatter/) — paste messy JSON, get it pretty-printed with syntax highlighting and error detection
- [Hex to RGB Converter](https://tool.teamzlab.com/dev/hex-to-rgb/) — convert between hex, RGB, HSL instantly
- [Base64 Encoder/Decoder](https://tool.teamzlab.com/dev/base64-encoder-decoder/) — encode/decode text and files without leaving your browser
- [URL Encoder/Decoder](https://tool.teamzlab.com/dev/url-encoder-decoder/) — handle query strings and encoded URLs
- [Markdown Preview](https://tool.teamzlab.com/dev/markdown-preview/) — write and preview markdown in real-time
Testing & Debugging
- [Regex Tester](https://tool.teamzlab.com/dev/regex-tester/) — test patterns with live highlighting and match groups
- [DNS Leak Test](https://tool.teamzlab.com/diagnostic/dns-leak-test/) — check if your VPN is actually protecting you
- [JWT Decoder](https://tool.teamzlab.com/dev/jwt-decoder/) — decode JWT tokens without pasting them into sketchy online tools
Productivity
- [Lorem Ipsum Generator](https://tool.teamzlab.com/dev/lorem-ipsum-generator/) — paragraphs, sentences, or words
- [Cron Expression Builder](https://tool.teamzlab.com/dev/cron-expression-builder/) — build cron schedules visually instead of memorizing the syntax
- [Automation ROI Calculator](https://tool.teamzlab.com/dev/automation-roi-calculator/) — figure out if automating that task is actually worth it
Why I built these
Every time I needed a quick JSON format or regex test, I'd land on a site plastered with ads that wanted my email. Or worse — a tool that sends my data to some random server.
These tools run 100% in your browser. Nothing gets uploaded. Close the tab and your data is gone.
All 50+ dev tools are at tool.teamzlab.com/dev
They work on mobile too — handy when you're debugging from your phone at 2am.
Originally published at [https://tool.teamzlab.com](https://tool.teamzlab.com)