Developer Tools

Free Online Developer Tools

Small, fast utilities for developers and technical users — color pickers, JSON formatters, password generators and more. No sign-up, no install, runs in your browser.

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Color Picker

Pick any color visually and get its HEX, RGB, and HSL values instantly. Copy with one click.

Open color picker →📋

JSON Formatter

Paste any JSON and get it formatted with proper indentation. Supports minify and copy to clipboard.

Format JSON →✅

JSON Validator

Check whether a JSON string is valid. See exactly which line has an error and why.

Validate JSON →🔐

Password Generator

Generate strong, random passwords with custom length and character rules. Copy instantly.

Generate password →📱

QR Code Generator

Turn any URL or text into a QR code. Download as PNG for printing or sharing.

Generate QR code →🎲

Random Number Generator

Generate random numbers within any range. Useful for testing, games, and statistics.

Generate number →

Why use these developer tools?

No setup required

Open the tool and use it immediately. No account, no extensions, no dependencies to install.

100% private

Nothing is ever sent to a server. All processing happens locally in your browser.

Works on any device

All tools run in any modern browser on desktop, tablet or mobile.

Completely free

Every tool on this page is free with no hidden costs and no ads.

Frequently asked questions

Are these developer tools free?: Yes, completely free. No sign-up, no subscription and no hidden costs.
Is any data sent to a server?: No. All processing is done locally in your browser. Nothing is sent to our servers.
Can I use these tools offline?: Yes. Once the page is loaded, all tools work without an internet connection.
Do these tools work on mobile?: Yes. All tools work in any modern mobile browser — no app needed.
Can I use the generated passwords safely?: Yes. Passwords are generated entirely in your browser using the Web Crypto API. They are never transmitted or stored anywhere.