Free developer tools
Format. Decode. Convert. Instantly.
30+ browser-based developer utilities. No sign-up, no data sent to
servers. Paste, transform, copy.
Popular tools
View all 30+ tools →JSON Formatter
Format & validate
Beautify, minify, and validate JSON with syntax highlighting and error detection.
Base64 Encoder
Encode & decode
Encode text or files to Base64 and decode Base64 strings back to their original form.
Regex Tester
Test & debug
Test regular expressions with real-time match highlighting, group capture, and cheat sheet.
JWT Decoder
Decode & inspect
Decode JWT tokens, inspect header, payload, and verify signature expiry.
Color Converter
HEX, RGB, HSL
Convert between HEX, RGB, HSL, and CMYK color formats with live preview.
URL Encoder
Encode & decode
Encode and decode URLs with special character handling and bulk processing.
Real-time output
Results appear as you type. No button. No delay.
Privacy first
Your data never leaves your browser. Ever.
Shareable links
Share results in one click.
Frequently asked questions
Are all tools free?
Yes. All 30+ tools are free forever. No account, no paywall, no usage limits — ever.
Is my data safe when I use these tools?
Completely. Every tool runs 100% in your browser. Nothing is sent to any server at any point.
Can I share my tool output with a teammate?
Yes. Each tool generates a shareable link that loads your exact input for anyone you send it to.
Do I need to install anything?
No. DevToolbox is entirely browser-based. Open the tool, paste your input, get your output — nothing to install.
What kinds of tools are available?
Formatters, encoders, decoders, converters, generators, validators, and minifiers — covering JSON, Base64, JWT, regex, color, URL, UUID, hash, and more.
Do you add new tools?
Yes. New tools are added regularly based on developer requests and search trends.