19+ Free Developer Tools

DevToolkit

Free developer utilities for JSON, encoding, generators, converters, security and productivity.Fast. Private. Browser-based.

19+

Tools

100%

Free

Sign-ups

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Privacy

Hot

JSON Formatter

Beautify, minify, and validate JSON with syntax highlighting.

JSON

JSON Validator

Validate JSON syntax and detect errors with line numbers.

JSON

Hot

Regex Tester

Test regular expressions with live matching and flag support.

Text

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 strings instantly.

Encoding

Hot

JWT Decoder

Decode and inspect JWT tokens — header, payload, and signature.

Security

UUID Generator

Generate cryptographically secure UUIDs (v1, v4) in bulk.

Generators

Password Generator

Generate strong, secure passwords with customizable character sets.

Security

Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa.

Converters

URL Encoder/Decoder

Encode or decode URL components and query strings instantly.

Encoding

Hot

QR Code Generator

Generate QR codes for URLs or text. Download as PNG.

Generators

Color Picker

Pick colors, convert between HEX, RGB, HSL, and generate palettes.

Web

HTML Previewer

Write and preview HTML, CSS, and JavaScript live in the browser.

Web

CSS Minifier

Minify CSS code to reduce file size and improve page load speed.

Code

Hot

JS Beautifier

Beautify and format minified or messy JavaScript code instantly.

Code

Markdown Previewer

Write Markdown and see a live rendered preview side by side.

Text

Diff Checker

Compare two texts side by side and highlight differences.

Text

SQL Formatter

Format and beautify SQL queries for better readability.

Code

Hot

Image Compressor

Compress JPG, PNG, and WebP images without visible quality loss.

Images

Hot

Image Converter

Convert images between PNG, JPG, WebP, AVIF and more formats.

Images

All tools run client-side · No data is sent to any server