Free Online Developer Tools
Fast, free, and private. 48 tools for formatting, converting, generating, and designing — all in your browser with zero sign-up.
JSON Formatter & Validator
Format, validate, and beautify JSON data with syntax highlighting
Base64 Encoder/Decoder
Encode and decode Base64 strings instantly
Word & Character Counter
Count words, characters, sentences, and paragraphs in your text
Color Palette Generator
Generate beautiful color palettes with hex, RGB, and HSL values
Regex Tester
Test and debug regular expressions with real-time matching, highlighting, and replacement preview
JWT Decoder
Decode and inspect JSON Web Tokens — view header, payload claims, expiration status, and signature
QR Code Generator
Generate QR codes from text, URLs, Wi-Fi credentials, and more. Download as PNG or SVG
Diff Checker
Compare two texts and find differences with unified and side-by-side views
UUID Generator
Generate UUIDs (v1, v4) with bulk generation, format options, and validation
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa with live clock
CSS Gradient Generator
Create beautiful CSS gradients visually with linear, radial, and conic options
SQL Formatter & Beautifier
Format, beautify, and minify SQL queries with keyword casing and custom indentation
HTML Beautifier & Formatter
Beautify, format, and minify HTML with proper indentation and void element handling
Markdown Editor & Preview
Write Markdown with live HTML preview, cheat sheet, and export to HTML
URL Encoder & Decoder
Encode and decode URLs with encodeURIComponent, encodeURI, and query string modes
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text input
Password Generator
Generate cryptographically secure random passwords with customizable length and character sets
JSON to CSV Converter
Convert JSON arrays to CSV and CSV back to JSON with nested object flattening and custom delimiters
XML Formatter & Beautifier
Format, beautify, and minify XML with proper indentation, comment handling, and attribute sorting
CSS Minifier & Beautifier
Minify CSS to reduce file size or beautify for readability with hex shortening and zero-unit removal
JavaScript Minifier & Beautifier
Minify and beautify JavaScript with safe string, template literal, and regex preservation
Color Converter
Convert colors between HEX, RGB, HSL, HSV, and CMYK formats with visual picker and live preview
Image Resizer
Resize images to any dimension with social media presets, percentage scaling, and PNG/JPEG/WebP export
Text Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and 7 more formats
Lorem Ipsum Generator
Generate placeholder text for designs, mockups, and layouts with paragraphs, sentences, words, or list items
JSON to YAML Converter
Convert between JSON and YAML formats instantly with bidirectional support
Cron Expression Parser
Parse cron expressions into human-readable schedules with next run times and syntax reference
YAML Formatter & Beautifier
Format, beautify, minify, and sort YAML with proper indentation for Kubernetes, Docker, and config files
HTML Entity Encoder & Decoder
Encode special characters to HTML entities or decode entities back to text with named, decimal, and hex formats
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal with BigInt precision and formatting
Image Compressor
Compress images to reduce file size with quality control. JPEG, WebP, and PNG output — all in your browser
Aspect Ratio Calculator
Calculate and convert aspect ratios for images, videos, and screens with social media and video presets
SVG to PNG Converter
Convert SVG files to PNG, JPEG, or WebP with custom scale, dimensions, and background options
JSON Schema Validator
Validate JSON data against JSON Schema (Draft-07) with detailed error reporting and path navigation
Unicode Character Map
Browse, search, and copy Unicode characters with code points, HTML entities, and CSS/JS escapes
Markdown to HTML Converter
Convert Markdown to clean, semantic HTML with pretty formatting, preview mode, and full document export
JSONPath Tester
Test and evaluate JSONPath expressions with dot notation, wildcards, array slices, filters, and recursive descent
Placeholder Image Generator
Generate placeholder images with custom dimensions, colors, and text. Download as PNG, JPEG, WebP, or SVG
Tailwind CSS Converter
Convert CSS to Tailwind utility classes and Tailwind back to CSS with 80+ property support
TOML Formatter & Validator
Format, beautify, minify, sort, and validate TOML files for Cargo.toml, pyproject.toml, and configs
Emoji Picker & Search
Search and copy 500+ emojis by name, keyword, or category. Click to copy, collect multiple, view Unicode details
CSV to JSON Converter
Convert CSV and TSV data to JSON with type detection, nested key unflattening, and RFC 4180 parsing
IP Address Lookup & Subnet Calculator
Find your public IP with geolocation, look up any IP address, and calculate subnets with CIDR notation
Image Format Converter
Convert images between PNG, JPG, WebP, BMP, and GIF formats instantly in your browser
CSS Box Shadow Generator
Create CSS box-shadow effects visually with multiple layers, blur, spread, color, and inset options
Color Picker from Image
Upload any image and pick colors with a click. Extract dominant color palettes with HEX, RGB, and HSL values
Barcode Generator
Generate Code 128, EAN-13, and UPC-A barcodes with custom size, colors, and PNG download
CSS Border Radius Generator
Generate CSS border-radius visually with individual corner controls, elliptical mode, presets, and live preview