Free Online Developer Tools
A collection of essential developer utilities — from JSON formatting and regex testing to color conversion and code generation. Every tool runs locally in your browser with zero data uploads. No sign-ups, no downloads, no tracking.
All Developer Tools (22)
JSON Formatter + Validator
Pretty print, minify, sort keys, and validate JSON safely.
JSON to Table Viewer
Render JSON data in a searchable table with column filters.
JSON to TypeScript
Convert JSON to TypeScript interfaces with nested types, export/optional/readonly options.
JSON to Zod Schema
Generate complete Zod validation schemas and TypeScript types directly from raw JSON.
Color Converter (HEX/RGB/HSL)
Convert between HEX, RGB, and HSL color formats with live preview and complementary colors.
Color Palette Generator
Generate design system shade scales (50–950) with 6 algorithms, export to CSS/Tailwind/JSON tokens, SVG/Figma.
WCAG Color Contrast Checker
Check color contrast ratios against WCAG 2.1 AA/AAA standards with color blindness simulation.
Docker to Compose Converter
Convert long 'docker run' CLI commands into clean docker-compose.yml files.
URL Encode/Decode + Query Parser
Encode/decode URLs, parse query params, remove params, and rebuild clean URLs.
Base64 Encode/Decode
Encode/decode Base64 safely. Includes validation and optional Data URL helper.
HTML Entity Encoder/Decoder
Encode special characters to HTML entities and decode entities back. Named and numeric modes.
UUID + NanoID Generator
Generate UUID v4 and NanoIDs locally using Web Crypto (single or bulk).
Regex Suite
Test patterns, highlight matches, inspect groups, and use common regex templates.
Number Base Converter
Convert between Decimal, Binary, Octal, and Hexadecimal with bit-width views.
Unix Timestamp Converter
Convert Unix timestamps to dates and dates to timestamps. Live clock with ISO 8601 and relative time.
Cron Expression Parser
Parse cron expressions into human-readable descriptions with next execution times and common presets.
SQL Formatter & Minifier
Format, beautify, and minify SQL queries with keyword uppercasing and indentation options.
Barcode Generator
Generate Code 128 barcodes with custom colors, dimensions, and PNG download.
QR Code Generator
Generate QR codes for URLs, text, WiFi, email, and phone. Customizable colors, size, error correction, and PNG/SVG download.
XML Formatter & Validator
Format, minify, and validate XML with live error detection. Convert XML to JSON instantly.
YAML ↔ JSON Editor
Edit, validate, and convert between YAML and JSON formats. Bidirectional conversion with formatting.
CSS Gradient Generator
Visual editor for creating CSS gradients (linear, radial, conic) with presets, color stops, and one-click CSS copy.
Why Use Our Developer Tools?
Format, validate, and convert JSON, SQL, TypeScript, and more in real time.
Test regex patterns, parse cron expressions, and generate UUIDs instantly.
Convert colors between HEX, RGB, HSL and check WCAG accessibility compliance.
All tools use your browser's built-in APIs — nothing is sent to a server.