Free Online Tools
No account, no installs, no data leaving your browser. Format, convert, and calculate instantly — completely free, every time.
Developer Tools
JSON Formatter
Format, validate, minify and convert JSON. Supports syntax highlighting, tree view, and instant error detection.
Base64 Encoder / Decoder
Encode and decode text or files to and from Base64. Preview decoded images and download files directly.
HTML Preview & Formatter
Format, minify, and preview HTML code in real-time. Supports syntax highlighting and responsive view.
JWT Decoder
Decode JSON Web Tokens instantly. Verify the header and payload claims securely without sending data to a server.
Regex Tester
Test and debug regular expressions in real-time with pattern highlighting, match group extraction, and replacement mode.
Color Converter
Convert colors between HEX, RGB, HSL, HSV and CMYK instantly with real-time preview and contrast checking.
Image & Media Tools
Text Tools
Free Online Developer Tools & Utilities
Every engineer runs into the same small tasks over and over: cleaning up a JSON payload, decoding a token, testing a regex before shipping it, converting a color code for a design system. This collection brings those everyday utilities together in one place — fast, free, and built to run entirely in your browser.
Why Use Browser-Based Developer Tools
Most free online tools quietly upload your data to a server to process it. That's a real risk when you're pasting production logs, API responses, or authentication tokens into a random website. Every tool in this collection is designed to avoid that:
- No server uploads — JSON payloads, JWT tokens, and code snippets are processed locally and never transmitted anywhere.
- No sign-up required — open a tool and start working immediately, with no account or login wall.
- No install needed — works directly in any modern browser, on desktop or mobile, as a lightweight alternative to downloading a dedicated app.
Who These Tools Are For
- Backend and API developers inspecting responses, webhooks, or tokens before they reach production code.
- Frontend engineers debugging malformed data or matching design-system colors precisely.
- QA and support teams decoding tokens or validating payloads without pulling in engineering.
- Students and self-taught developers learning how JSON, regex, and encoding actually work by testing real examples.
Frequently Asked Questions
Are these developer tools completely free?
Yes. Every tool here is free with no usage limits, no paywalls, and no account required.
Is my data safe when I use these tools?
Yes. Wherever technically possible, processing happens entirely client-side in your browser — payloads, tokens, and code snippets are never sent to a server.
Can I use these instead of installing desktop software?
For quick, one-off tasks like formatting a JSON payload or decoding a JWT, these browser tools are usually faster than opening a dedicated desktop app or IDE plugin.
Do I need to create an account to use these tools?
No. There's no sign-up, no login, and no email required — open a tool and use it immediately.
Will more tools be added to this collection?
Yes. This is a growing collection, with new utilities added based on common developer workflows.