Free Online Developer Tools
Fast, secure, and 100% client-side. No data leaves your browser.
JSON Diff
Compare two JSON objects and visualize differences side-by-side.
Regex Tester
Test JavaScript regular expressions with real-time matching and pattern presets.
JSON Formatter
Beautify, minify, and validate JSON data with instant error detection.
Base64 Encoder
Encode and decode Base64 strings with full UTF-8 support.
URL Encoder
Encode/decode URLs and parse query strings into key-value pairs.
UUID Generator
Generate UUID v4 instantly. Bulk generate with format options.
Hash Generator
Generate MD5, SHA-1, SHA-256 and more hashes instantly.
Lorem Ipsum
Generate placeholder text by words, sentences, or paragraphs.
Word Counter
Count words, characters, sentences, and estimate reading time.
JWT Decoder
Decode JSON Web Tokens and inspect header, payload, and expiration.
QR Code Generator
Generate QR codes from text or URLs. Download as PNG.
Timestamp Converter
Convert Unix timestamps to dates and vice versa. Live current time.
Password Generator
Generate strong, random passwords with customizable length and character options.
Text Diff
Compare two text blocks side-by-side with line-by-line diff highlighting.
Color Converter
Convert colors between HEX, RGB, and HSL formats with live preview.
CSV to JSON
Convert CSV data to JSON format and JSON arrays back to CSV.
Image to Base64
Convert images to Base64 encoded strings with multiple output formats.
JSON to YAML
Convert between JSON and YAML formats instantly. No dependencies.
Cron Expression Parser
Parse cron expressions into plain English and preview next run times.
HTML Entity Encoder
Encode and decode HTML entities for special characters.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal.
Markdown Preview
Write markdown and see a live rendered HTML preview side by side.