Developer Tools
Free online developer utilities. Format JSON, encode/decode data, generate UUIDs, test regex, and more.
JSON Formatter
Format and validate JSON online for free. Pretty print, minify, and validate JSON with error highlighting.
Base64 Encoder / Decoder
Encode and decode Base64 online for free. Text to Base64 and Base64 to text.
URL Encoder / Decoder
URL encode and decode online for free. Encode special characters for URLs or decode percent-encoded strings.
UUID Generator
Generate UUIDs online for free. Create random UUID v4 identifiers. Generate single or batch UUIDs.
Password Generator
Generate strong passwords online for free. Customize length and character sets. Includes strength meter.
Hash Generator
Generate cryptographic hashes online for free. MD5, SHA-1, SHA-256, SHA-512. All computed locally in your browser.
JWT Debugger
Decode and debug JWT tokens online for free. View header, payload, and signature.
HTML Entity Encoder / Decoder
Encode and decode HTML entities online for free. Convert special characters to HTML entities and back.
Regex Tester
Test regular expressions online for free. Real-time matching with highlighting, capture groups, and flag support.
CSS & JS Minifier
Minify CSS and JavaScript online for free. Reduce file size for production. Shows original vs minified size.
Color Converter
Convert colors between HEX, RGB, and HSL formats. Pick any color and get all formats instantly.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
URL Parser
Parse any URL into its components — protocol, host, path, query parameters, and hash.
Binary/Hex/Octal Converter
Convert numbers between decimal, binary, hexadecimal, and octal formats in real-time.
CSV to JSON Converter
Convert CSV data to JSON and JSON to CSV. Auto-detects delimiters with first-row-as-headers option.
SQL Formatter
Format and beautify SQL queries. Uppercase keywords, proper indentation. Minify option included.
Meta Tag Generator
Generate complete HTML meta tags for SEO. Preview how your page looks in Google search results.
CSS Gradient Generator
Create beautiful CSS gradients visually. Linear and radial gradients with live preview and CSS code output.
Box Shadow Generator
Generate CSS box-shadow with live preview. Adjust offset, blur, spread, and color.
Color Contrast Checker
Check text/background color contrast ratio against WCAG accessibility standards.
HTML Preview
Write and preview HTML/CSS/JS code in real-time. Split view with live iframe rendering.
XML Formatter
Format, minify, and validate XML with proper indentation.
HTTP Status Codes
Complete HTTP status code reference. Search, browse, and copy codes.
HTML Color Names
Browse all 140+ named HTML colors. Click to copy hex values.
What Is My IP
Find your public IP address and browser information. See user agent, screen resolution, timezone and more.
typing-test
Test your typing speed. Measure WPM, accuracy, and errors in 60 seconds.
reaction-time
Test your reaction time. Click when the screen turns green.
keycode-finder
Press any key to see its key code, key name, and modifier status. Useful for developers.
screen-resolution
Check your screen resolution, viewport size, pixel ratio, and color depth.
json-diff
Compare two JSON objects side-by-side and see highlighted differences.
base64-image
Decode base64 strings to image preview and encode images to base64 format.
md5-hash
Generate MD5 hash from any text input. Quick copy with one click.
ulid-gen
Generate sortable ULID identifiers with embedded timestamp components.
nanoid-gen
Generate compact Nano IDs with customizable length and alphabet.
color-name
Look up CSS color names by hex value or find hex values by color name.
gradient-preview
Create and preview CSS gradients interactively. Adjust angle and color stops. Copy generated CSS.
css-specificity
Calculate CSS specificity scores (0,0,0,0 format) for any CSS selector.
easing-preview
Preview CSS easing functions with interactive animation demos and presets.
viewport-size
Check your current viewport dimensions and compare against common device breakpoints.
user-agent-parser
Parse any user agent string to identify browser, OS, and device information.
mime-checker
Look up MIME types by file extension or find extensions by MIME type.
json-schema
Generate JSON Schema from any JSON object. Simple and automatic schema inference.
lorem-image
Generate placeholder image URLs with custom dimensions using picsum.photos.
yaml-validator
Validate YAML syntax, check for errors, and view formatted output.
ASCII Table
Complete ASCII reference table (0-127). Decimal, hex, octal, binary codes with character display.
Periodic Table
Interactive periodic table. Browse elements with color-coded categories and detailed info.
Resistor Color Code Calculator
Calculate resistor values from color bands. 4-band and 5-band support.