Developer Tools
Free developer utilities online. Format JSON, test regex, convert data, generate cron expressions, convert colors, and more — all in your browser.
26 tools
JSON Schema Generator
Generate a JSON Schema from a sample payload, or validate JSON against an existing schema. Type inference, format detection, clear errors. Free.
Meta Tags Generator
Generate a complete HTML meta tag block with title, description, Open Graph, Twitter cards and canonical. Live Google and social previews. Free.
JSON Formatter
Format, minify, and validate JSON online. Instant error detection, adjustable indentation. Free, private, no signup required.
Regex Tester
Test and debug regular expressions online with live match highlighting. Supports all JavaScript regex flags. Free, private, browser-based.
SQL Formatter
Format and beautify SQL queries with proper indentation and keyword capitalization. Free, private, browser-based.
Markdown to HTML
Convert Markdown to HTML with live preview online. Supports headings, bold, italic, lists, links, code blocks. Free and private.
Cron Generator
Build cron expressions visually with human-readable descriptions. Preset schedules, custom fields. Free, private, browser-based.
JSON to CSV
Convert JSON arrays to CSV and CSV back to JSON online. Instant conversion, copy to clipboard. Free, private, no signup.
Number Base Converter
Convert numbers between decimal, binary, hexadecimal, and octal bases instantly. Free, private, no signup required.
Color Converter
Convert colors between HEX, RGB, and HSL formats instantly. Visual color preview, one-click copy. Free and private.
JSON Diff
Compare two JSON objects side by side and instantly see what was added, removed, or changed. Free, browser-based JSON diff tool.
YAML to JSON
Convert YAML to JSON and JSON to YAML instantly in your browser. Perfect for Kubernetes, Docker, and API workflows. Free, private, no upload needed.
Chmod Calculator
Calculate Unix file permissions visually. Toggle read, write, execute for owner, group, and others. Get octal (755) and symbolic notation instantly.
CSS Gradient Generator
Build CSS gradients from scratch with a live preview — linear, radial, or conic, unlimited color stops, adjustable angle. Copy the CSS with one click.
HTTP Status Codes
Complete searchable reference for all HTTP 1xx–5xx status codes. Filter by category, search by code or name, and understand what every code means.
JS & CSS Minifier
Minify JavaScript or CSS instantly. Remove whitespace and comments, shorten variable names, and see the size reduction. Free and private.
XML Formatter & Validator
Format, minify, and validate XML instantly. Convert XML to JSON with attribute handling. Free, private, runs entirely in your browser.
cURL to Code Converter
Convert a curl command into JavaScript fetch, axios, Python requests, or Go code. Paste from devtools and get working code instantly. Free.
Mock Data Generator
Generate realistic fake test data — names, emails, addresses, UUIDs, dates — and export as JSON, CSV, or SQL INSERT statements. Free, no signup.
Code to Image
Turn a code snippet into a shareable image with syntax colouring, themes, and gradient backgrounds. Free, no signup, runs in your browser.
.gitignore Generator
Build a .gitignore file by picking your language, framework, OS, and editor. Combines templates, removes duplicates, and adds custom rules. Free.
CSS Unit Converter
Convert between px, rem, em, pt, %, vw and vh instantly. Set your own root and parent font size. Free CSS unit converter with a px-to-rem reference table.
Box Shadow Generator
Build CSS box shadows visually with offset, blur, spread, colour and inset. Stack multiple layers, preview live, and copy the CSS. Free.
Schema Markup Generator
Generate valid JSON-LD structured data for Article, Product, FAQ, Local Business, Event, Recipe and Organization. Required-field checks included. Free.
CSV to JSON
Convert CSV to JSON with automatic delimiter detection, type coercion and nested keys. Handles quoted fields, escaped quotes and embedded newlines. Free.
HTML to Markdown
Convert HTML to clean Markdown, including tables, code blocks, lists and links. Choose bullet and emphasis style. Runs in your browser, nothing uploaded.