Free Online Developer Tools
Fast, free, browser-based tools for developers. No signup required. Your data never leaves your browser.
Formatters
JSON Formatter & Validator
Format, beautify, minify and validate JSON data online. Supports syntax highlighting and error detection.
HTML Formatter & Beautifier
Format, beautify and minify HTML code with proper indentation and syntax highlighting.
XML Formatter
Format and beautify XML documents with proper indentation. Validates XML structure.
Markdown Preview
Write Markdown and preview the rendered HTML in real-time. Copy the generated HTML with one click.
CSS Minifier
Minify and beautify CSS code online. Remove comments, whitespace and optimize for production.
JavaScript Minifier
Minify JavaScript code by removing comments, whitespace and unnecessary characters.
SQL Formatter
Format and beautify SQL queries with proper indentation and keyword uppercasing.
Line Sort & Deduplicate
Sort lines alphabetically or numerically, remove duplicates, reverse order and trim whitespace.
Encoders
Base64 Encode / Decode
Encode text to Base64 or decode Base64 strings instantly. Supports UTF-8 and binary data.
URL Encode / Decode
Encode or decode URL components. Handles special characters, query strings and full URLs.
HTML Entity Encoder
Encode and decode HTML entities. Supports named, numeric and hex entity formats.
Image to Base64 Converter
Convert images to Base64 data URIs. Upload PNG, JPG, GIF, SVG or WebP and get instant Base64 output.
Text Escape & Unescape
Escape and unescape text for JSON, HTML, XML, CSV and JavaScript. Handle special characters safely.
SVG to CSS Converter
Convert SVG code to CSS background-image data URI. Minify and encode SVG for inline CSS use.
Decoders
Generators
UUID Generator
Generate random UUIDs (v4) in bulk. Copy individual or all UUIDs with one click.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input.
Lorem Ipsum Generator
Generate placeholder Lorem Ipsum text by paragraphs. Customizable with word and character counts.
Password Generator
Generate secure random passwords with customizable length, character sets and strength indicator.
QR Code Generator
Generate QR codes from text or URLs. Download as SVG or PNG with customizable size and error correction.
URL Slug Generator
Generate SEO-friendly URL slugs from text. Supports transliteration, stop word removal and custom separators.
Markdown Table Generator
Create Markdown tables visually with an interactive editor. Add rows, columns and align content.
CSS Box Shadow Generator
Design CSS box shadows visually with real-time preview. Adjust offset, blur, spread and color.
CSS Gradient Generator
Create CSS linear and radial gradients visually. Add color stops, adjust angles and copy CSS code.
Meta Tag Generator
Generate HTML meta tags for SEO, Open Graph and Twitter Cards. Preview and copy complete tag sets.
JWT Generator
Create JSON Web Tokens with custom headers, payloads and HMAC signing. Set expiration and claims.
Placeholder Image Generator
Generate placeholder images with custom size, color and text. Download as PNG or SVG.
Favicon Generator
Generate favicons from text or emoji. Download as ICO, PNG and SVG with multiple sizes.
Testers
Regex Tester
Test regular expressions with real-time matching, capture groups, and flag support.
Diff Checker
Compare two texts side by side and highlight differences. Find additions, deletions and changes instantly.
Cron Expression Parser
Parse cron expressions to human-readable descriptions. Shows next execution times and field breakdown.
Word & Character Counter
Count words, characters, sentences and paragraphs in real-time. Shows reading and speaking time.
Chmod Calculator
Interactive Linux file permission calculator. Convert between numeric and symbolic chmod notation.
HTTP Status Codes
Searchable reference for all HTTP status codes with detailed descriptions and use cases.
Open Graph Preview
Preview how your URL appears on Facebook, Twitter and LinkedIn. Test Open Graph and meta tags.
ASCII Table Reference
Searchable ASCII character code table. View decimal, hex, octal and binary values for all 128 characters.
Converters
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
Color Picker & Converter
Pick colors and convert between HEX, RGB and HSL formats. Real-time preview and copy support.
YAML ↔ JSON Converter
Convert between YAML and JSON formats. Supports nested objects, arrays and comments.
JSON ↔ CSV Converter
Convert between JSON arrays and CSV format. Supports custom delimiters and nested object flattening.
Number Base Converter
Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36.
String Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase and 8 more case styles.
JSON to TypeScript
Generate TypeScript interfaces and types from JSON data. Supports nested objects and arrays.
Text to Binary Converter
Convert text to binary code and binary back to text. Supports ASCII and UTF-8 encoding.
HTML to Markdown Converter
Convert HTML code to clean Markdown syntax. Handles headings, lists, links, images and tables.
Aspect Ratio Calculator
Calculate and convert aspect ratios. Find width or height from a given ratio and one dimension.
CSS Units Converter
Convert between CSS units: px, rem, em, vw, vh and pt. Set base font size for accurate conversion.
Data Size Converter
Convert between bytes, KB, MB, GB, TB and PB. Supports both binary (1024) and decimal (1000) units.
Time Zone Converter
Convert times between time zones worldwide. Compare multiple zones side by side with DST support.