Free Online Developer Tools
Fast, private, and free utilities for formatting, converting, validating, testing, and analyzing text. All processing happens in your browser.
CSS
Responsive Font Size
Generate CSS clamp().
CSS Gradient Text
Background-clip gradient text.
CSS Transform Playground
Rotate, scale, skew.
Cubic-Bezier Editor
Edit easing function.
CSS Box-Shadow
Generate box-shadow CSS.
CSS Text-Shadow
Generate text-shadow CSS.
Border-Radius
Corner radius CSS.
Flexbox Playground
Experiment with flex props.
CSS Grid Generator
Generate grid CSS.
CSS Clip-Path Maker
Generate clip-path CSS.
Keyframes Generator
Generate @keyframes + animation.
CSS Button Generator
Custom button CSS.
CSS Glassmorphism
Translucent card CSS.
CSS Neumorphism
Soft UI box shadows.
Icon Button
Circular icon button CSS.
Spinner/Loader
CSS spinner generator.
Typography Scale
Modular scale variables.
Background Pattern
Stripe gradient pattern.
Shape Divider
SVG wave divider.
Filter Playground
CSS filter adjustments.
Calculators
Colors
Converters
CSV to JSON Converter
Convert CSV data to JSON easily.
JSON to CSV Converter
Turn JSON into CSV with proper quoting.
Markdown to HTML
Render Markdown content to HTML.
HTML to Markdown
Convert HTML markup back to Markdown.
HTML Entities
Encode/Decode HTML entities.
Timestamp ⇄ Date
Convert timestamp and date.
px ⇄ rem
Convert between px and rem.
File Size Converter
Bytes and human-readable sizes.
Image ⇄ Base64
Convert images to/from Base64 (10 MB).
Roman Numeral Converter
Convert numbers and Roman numerals.
Binary → Decimal
Convert base-2 to base-10.
Decimal → Binary
Convert base-10 to base-2.
Decimal → Hex
Convert base-10 to base-16.
Hex → Decimal
Convert base-16 to base-10.
Binary → Hex
Convert base-2 to base-16.
Hex → Binary
Convert base-16 to base-2.
% → px Converter
Layout percentage to pixels.
Viewport Unit Converter
vh/vw to px.
Morse Encoder/Decoder
Text ↔ Morse code.
HTML Table → CSV
Extract CSV from HTML table.
CSV → HTML Table
Generate HTML table.
Unit Converter
Length, weight, temperature.
Encoders / Decoders
Formatters
HTML Formatter
Beautify and format HTML for readability.
CSS Formatter
Prettify CSS with consistent spacing and ordering.
JavaScript Formatter
Format JavaScript/TypeScript code for better readability.
JSON Formatter
Pretty-print JSON with indentation and validation.
XML Formatter
Format and indent XML for clean structure.
JavaScript Minifier
Minify JS using Terser.
JSON Minifier
Remove whitespace from JSON.
HTML Minifier
Minify HTML safely.
XML Minifier
Minify XML content.
Fun
Generators
UUID Generator
Generate v4 UUIDs.
Random String
Create random strings with custom charset.
Random Number
Generate random integers in range.
Credit Card (Luhn)
Generate Luhn-valid test numbers.
QR Code Generator
Create QR codes.
Barcode Generator
Create CODE128 barcodes.
Password Generator
Generate strong passwords.
Math
Golden Ratio
Split lengths by φ.
Fibonacci Generator
Generate sequence.
Prime Checker
Test primality.
Factorial Calculator
Compute n!
GCD/LCM Calculator
Greatest common divisor / LCM.
Percentage Calculator
X% of Y and change.
Probability Calculator
Union & intersection (independent).
BMI Calculator
Body Mass Index.
Equation Solver
Linear/quadratic equations.
Matrix Calculator
Add/multiply matrices.
Graph Plotter
Plot y = f(x).
SEO
Text
Utilities
Word Counter
Count words, characters, lines, and reading time.
Character Counter
Count characters with and without spaces.
Case Converter
Convert text to upper, lower, title, or sentence case.
Text Reverser
Reverse the order of characters in text.
SHA-256 Hash
Hash text via Web Crypto.
Text Similarity
Cosine similarity between two texts.