Developer Tools
47 tools
Forty-seven tools for the everyday jobs that interrupt writing code. The data group formats, validates and converts JSON, including JSON to CSV, to TypeScript interfaces and to a collapsible tree view, and formats SQL. The encoding group covers Base64, URL encoding, HTML entities, JWT decoding, timestamps and epoch conversion, and hash generation. The colour group covers a picker, hex-to-RGB conversion, a contrast checker against WCAG thresholds and a palette extractor that reads colours out of an uploaded image. The CSS group minifies, builds grids, buttons, animations and Tailwind equivalents. The SEO and metadata group generates and analyses meta tags, Open Graph tags, robots.txt, sitemaps, FAQ schema and general schema markup. There are also a regex tester with live match highlighting, a cron expression builder and parser, Markdown preview and table tools, and a UUID generator.
Tools
Color Picker
Pick any color and get HEX, RGB, and HSL values instantly. Extract colors from images or create custom color schemes.
JSON Formatter
Format, validate, and beautify JSON data online. Minify or prettify JSON with syntax highlighting and error detection.
Base64 Encoder/Decoder
Encode and decode Base64 strings online for free. Convert text, images, or files to Base64 format instantly in your browser.
URL Encoder/Decoder
Encode and decode URLs for safe web transmission. Convert special characters to percent-encoding and back. Free URL tool.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes online. Secure hash calculator for passwords, files, and data verification.
UUID Generator
Generate unique UUIDs (Version 1, 4, and custom) for databases, APIs, and software development. Batch generation supported.
Regex Tester
Test and debug regular expressions online with real-time matching. Support for multiple regex flavors and explanation mode.
Screen Resolution
Check your screen resolution, pixel density, and display information. Test responsive breakpoints and monitor specifications.
Robots.txt Generator
Create a robots.txt file for your website. Control which search engines can crawl your pages, block AI bots, and manage sitemaps.
Meta Tag Analyzer
Analyze meta tags of any URL. Get SEO score, Google preview, social media preview and actionable recommendations.
Open Graph Checker
Preview how your URL looks when shared on Facebook, Twitter, LinkedIn and Slack. Check Open Graph and Twitter Card meta tags.
Markdown Preview
Preview Markdown in real-time as you type. See formatted output instantly with syntax highlighting and export options.
HTML Encoder/Decoder
Encode and decode HTML entities online for free. Convert special characters to HTML codes and vice versa. Safe for web use.
Timestamp Converter
Convert Unix timestamps to readable dates and vice versa. Support for milliseconds and multiple date formats. Free converter.
HEX to RGB Converter
Convert a hex colour to RGB, HSL and a CSS variable, edit any of the three, and read the WCAG contrast against white and black.
Cron Expression Parser
Parse, explain, and generate cron expressions. Understand cron schedules with human-readable descriptions and next run times.
Markdown Table Generator
Create Markdown tables easily with our visual editor. Design tables with headers, alignment, and copy formatted code.
JWT Decoder
Decode and inspect JWT tokens online. View header, payload, and signature claims. Validate token structure and expiration.
JSON to CSV Converter
Convert JSON data to CSV format instantly. Supports nested objects, arrays, custom delimiters, and bulk data.
CSS Minifier & Beautifier
Minify or beautify your CSS code. Reduce file size by removing comments, whitespace, and optimizing selectors.
HTML to Markdown Converter
Convert HTML code to Markdown format. Supports headings, links, images, lists, tables, code blocks and more.
JSON Validator
Validate, format, and minify JSON data with path queries and deep analysis.
SQL Formatter
Format, beautify, and minify SQL queries with syntax highlighting.
JSON to TypeScript
Convert JSON data to TypeScript interfaces and types. Generate type-safe code from API responses automatically.
CSS to Tailwind
Convert CSS code to Tailwind CSS utility classes. Paste your CSS and get equivalent Tailwind classes instantly.
Password Strength Checker
Check how strong your password is. Analyze entropy, crack time, and get suggestions to improve security.
QR Code Scanner
Scan QR codes from images or camera. Decode URLs, text, WiFi, contacts and more instantly.
Cron Expression Builder
Build cron expressions visually. Set schedule with interactive controls and see next execution times.
Color Palette Extractor
Upload an image to extract its dominant color palette. Get HEX, RGB values and percentages.
Epoch Converter
Convert Unix epoch timestamps to human-readable dates and vice versa. Live clock, presets, and history.
View Page Source
Fetch and read the HTML source of any public page, with syntax highlighting, line and character counts, copy and download — even on a phone.
CSS Grid Generator
Lay out a CSS grid visually and copy the grid-template-columns, grid-template-rows and gap it produces, with the matching HTML.
Color Contrast Checker
Check color contrast ratio for WCAG accessibility compliance. Test foreground and background colors for AA and AAA standards.
JSON Visualizer
Visualize JSON data as an interactive tree. Format, minify, and analyze your JSON with statistics. Embeddable on developer blogs.
Meta Tag Generator
Generate SEO-optimized meta tags with Open Graph and Twitter Card support. Preview your Google SERP listing.
Social Media Image Sizes
Complete guide to image sizes for Instagram, Facebook, Twitter, YouTube, TikTok, LinkedIn and Pinterest in 2025.
CSS Animation Generator
Build a CSS keyframe animation from 16 presets, tune duration, delay, timing and fill mode, and copy the @keyframes rule with its shorthand.
Open Graph Preview
Preview how your content appears on Facebook, Twitter, LinkedIn, Discord, Slack and WhatsApp before sharing.
XML Sitemap Generator
Create XML, HTML, or TXT sitemaps for your website. Add URLs manually or in bulk with priority, change frequency, and last modified date.
Schema Markup Generator
Generate JSON-LD structured data for rich search results. Supports LocalBusiness, Article, Product, FAQ, Event, Person, Breadcrumb, and HowTo schemas.
.htaccess Generator
Generate .htaccess files for Apache servers. Configure HTTPS redirect, security headers, Gzip compression, browser caching, hotlinking protection, and custom redirects.
Open Graph Generator
Generate Open Graph and Twitter Card meta tags for perfect social media sharing. Live preview for Facebook, Twitter/X, and LinkedIn.
JavaScript Minifier
Minify JavaScript code online for free. Remove comments, whitespace, and optimize your JS files for faster page loading.
HTTP Header Checker
Check HTTP response headers and security score for any website. Analyze HSTS, CSP, X-Frame-Options, and other security headers.
CSS Button Generator
Design custom CSS buttons with live preview. Customize colors, borders, shadows, gradients and get the code instantly.
HTML Table Generator
Create HTML tables visually with customizable styles. Edit cells, import CSV, and export as HTML, Bootstrap, Tailwind or Markdown.
FAQ Schema Generator
Build schema.org FAQPage JSON-LD from your question and answer pairs, with pair validation, a snippet preview and one-click copy.