Developer Tools
Free developer utilities that run entirely in your browser — format, validate, and convert code and data with no uploads. Beautify and check JSON, decode and generate JWTs, minify CSS/JS/HTML, format SQL, diff JSON, and build cron schedules. Working with plain text instead? See the Text tools; for money maths, the Finance calculators.
CSV to JSON & JSON to CSV Converter
Convert CSV to JSON and JSON to CSV, both directions in one tool. Choose your delimiter and header handling.
CSS Gradient Generator
Design linear and radial CSS gradients visually with multiple colour stops, live preview, and copy-ready CSS.
JSON Diff Checker
Compare two JSON objects and highlight the differences visually.
CSS Minifier
Minify CSS code online to reduce file size and improve loading speed.
JSON to YAML Converter
Convert JSON to YAML and YAML to JSON seamlessly with syntax highlighting.
JavaScript Minifier
Minify, compress, and obfuscate JavaScript code online. Reduces file size.
Markdown Preview
Live preview and convert Markdown to HTML online.
Cron Expression Generator
Easily generate and parse cron expressions for task scheduling.
HTML Minifier
Minify HTML code online to reduce file size and improve loading speed.
JSON Formatter
Format, validate, and beautify JSON data online.
SQL Formatter
Format and beautify messy SQL queries for better readability.
Regex Tester
Test and debug regular expressions online with syntax highlighting and explanations.
Color Picker & Converter
Extract, convert, and pick colors easily. Supports HEX, RGB, HSL, and more.
XML Formatter
Format, validate, and beautify XML data online.
Text Diff Checker
Compare two text documents and find the differences instantly.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes instantly from any text.
JWT Decoder
Decode JWT tokens online in your browser.
Meta Tag & Open Graph Generator
Generate SEO meta tags plus Open Graph and Twitter Card markup, with a live social-share preview.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly.
JWT Generator
Generate JWT tokens online in your browser.
Glassmorphism & Neumorphism CSS Generator
Visually design glassmorphism (frosted glass) and neumorphism (soft UI) effects with sliders and copy the exact CSS.
AI Prompt Token Counter
Count the exact number of tokens in a prompt for OpenAI models (GPT-4o, GPT-4, GPT-3.5) before you call the API.