Developer Tools
Developer Tools
5 free utilities every developer reaches for — formatting, encoding, and more.
JSON Formatter & Validator
Format, validate, and minify JSON data instantly
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Base64 Encoder / Decoder
Encode or decode Base64 strings in one click
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URL Encoder / Decoder
Encode or decode URL-safe strings
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Color Code Converter
Convert color codes between HEX, RGB, and HSL formats
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Strong Password Generator
Generate strong, secure passwords with custom rules
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CSS Formatter & Beautifier
Format and beautify or minify CSS code online
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HTML Formatter & Beautifier
Format and beautify or minify HTML code with proper indentation
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XML Formatter & Beautifier
Format and validate XML. Check if XML is well-formed
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CSV Formatter Online
Format CSV data and preview it as a table with multiple delimiter support
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CSV to JSON Converter
Convert CSV data to a JSON array instantly
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JSON to CSV Converter
Convert a JSON array to CSV format instantly
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JSON to JSONP Converter
Wrap JSON in a JSONP callback function for cross-domain requests
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JSONP to JSON Converter
Strip JSONP callback wrapper and extract the pure JSON
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Cron Job Expression Generator
Generate cron expressions with human-readable descriptions and presets
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Mask Sensitive Data
Mask emails, phone numbers, and credit cards in text
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Password Strength Checker
Check password strength with a live meter and criteria checklist
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Random Email Generator
Generate random email addresses for testing and development
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Random Username Generator
Generate random usernames in various styles for accounts and profiles
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Domain Name Extractor
Extract domain names from URLs and text with deduplication
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Sitemap XML Validator
Validate sitemap XML structure and list all URLs found
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Online Screen Keyboard
Virtual on-screen keyboard with shift, caps lock, and copy support
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UUID Generator
Generate random UUID v4 or timestamp-based UUID v1 in bulk
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Hash Generator (SHA-256 / MD5)
Generate SHA-256, SHA-1, and MD5 hashes from any text
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HTML Entity Encoder / Decoder
Encode or decode HTML special characters and entities
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Regex Tester
Test regular expressions with live match highlighting
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JWT Decoder
Decode JWT tokens and inspect header and payload
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JSON to YAML Converter
Convert JSON data to YAML format in the browser
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YAML to JSON Converter
Convert basic YAML to pretty-printed JSON
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SQL Formatter Online
Format and beautify SQL queries or minify to one line
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Number to Words Converter
Convert integers up to 999 billion into English words
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CSS Gradient Generator
Build linear or radial CSS gradients visually and copy ready-to-use CSS code
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Color Palette Generator
Generate complementary, analogous, triadic, and monochromatic color palettes
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Color Contrast Checker
Check color contrast ratio for WCAG 2.1 AA and AAA accessibility compliance
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Meta Tag Generator
Generate complete HTML meta tags including SEO, Open Graph, and Twitter Card tags
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Robots.txt Generator
Generate a robots.txt file with custom crawler rules, disallow paths, and sitemap URL
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Image to Base64 Converter
Convert PNG, JPG, GIF, SVG, or WebP images to Base64 data URI for HTML and CSS
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QR Code Generator
Generate QR codes from URLs, text, email, phone, or Wi-Fi. Download as PNG or SVG
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CSS Box Shadow Generator
Visually build CSS box-shadow styles with live preview and copy the CSS code
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CSS Flexbox Generator
Configure flexbox container properties visually with live preview and copy CSS
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PX ↔ REM / EM Converter
Convert CSS units between pixels, REM, and EM with bulk conversion and reference table
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UTM Link Builder
Build UTM-tagged campaign URLs for Google Analytics. Add source, medium, campaign, and more
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URL Parser & Analyzer
Parse any URL into protocol, hostname, path, query parameters, and hash. Edit and rebuild URLs
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CSS Border Radius Generator
Control each corner radius individually with live preview and copy the CSS code
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JSON ↔ XML Converter
Convert JSON to XML and XML to JSON instantly with formatted output
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CSS Grid Generator
Build CSS grid layouts visually with live preview and instant code export
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IP Address Lookup
Look up geolocation, ISP, and timezone for any IP address instantly
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HTTP Status Codes
Complete reference for all HTTP status codes 1xx–5xx with descriptions
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Color Blindness Simulator
Simulate how images and colors appear with different types of color blindness
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Markdown Table Generator
Build Markdown tables visually and copy the code instantly.
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Image to Base64
Convert any image to Base64 data URI for embedding in code.
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