Free Online Developer Tools

Fast, free, and private. All tools run directly in your browser — no data is ever sent to a server.

All Tools

🔤

Base64 Encoder/Decoder

Encode and decode Base64 strings and files instantly.

📋

JSON Formatter & Validator

Format, validate, and beautify JSON data with tree view.

🔗

URL Encoder/Decoder

Encode and decode URL components for safe transmission.

🔍

Regex Tester

Test regular expressions with real-time matching and flags.

🔒

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes using Web Crypto API.

🎨

Color Picker & Converter

Pick colors and convert between HEX, RGB, and HSL formats.

🎫

JWT Decoder

Decode and inspect JSON Web Tokens, check expiration.

📝

Markdown Preview

Write Markdown and see live rendered preview side by side.

📱

QR Code Generator

Generate QR codes from any text or URL, download as image.

📊

Diff Checker

Compare two texts and highlight differences line by line.

🔢

Word & Character Counter

Count words, characters, sentences, paragraphs, and reading time.

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and back.

📄

Lorem Ipsum Generator

Generate placeholder text by paragraphs, sentences, or words.

🖼️

Image to Base64 Converter

Convert images to Base64 encoded strings and Data URIs.

✂️

CSS Minifier / Beautifier

Minify CSS to reduce file size or beautify for readability.