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Free developer tools

Format, validate, minify, encode, decode and convert code and data: JSON, HTML, CSS, JavaScript, SQL, Base64, hashes, regex and more.

QR Code GeneratorMake QR codes for websites, Wi-Fi, WhatsApp, contact cards and more Password GeneratorCreate strong, random passwords or memorable passphrases JSON Formatter & ValidatorPretty-print messy JSON, find exactly where it is broken, or minify it for production Color PickerChoose a colour and get every code format, matching shades and tints, and a contrast… Barcode GeneratorCreate Code 128, EAN-13, UPC and other barcodes for products, labels and inventory… Base64 Encode & DecodeConvert text to Base64 and back, with full support for emoji, Urdu and other Unicode… Online HTML EditorWrite or paste HTML, CSS and JavaScript and see the result live as you type QR Code ScannerRead a QR code with your camera or from an image, and see what it contains before you… JSON ValidatorCheck whether JSON is valid and see exactly where any error is, by line and column Wi-Fi QR Code GeneratorLet guests join your Wi-Fi by scanning a code HEX to RGB Color ConverterConvert colour codes between HEX, RGB, HSL, HSV and CMYK in one step Hash Generator (MD5, SHA-256)Create MD5 and SHA hashes of text, or get a file’s checksum to verify a download MD5 Hash GeneratorGet the 32-character MD5 hash of any text or file Number Base ConverterType a number in any base and instantly see it in binary, decimal, hexadecimal and octal Regex TesterWrite a regular expression and see every match highlighted live, with capture groups… URL Encode & DecodeMake text safe for URLs and query strings, or turn %-encoded links back into readable… UUID GeneratorCreate universally unique identifiers in bulk: random v4 or sortable v7 Unix Timestamp ConverterTurn epoch timestamps into readable dates, or get the timestamp for any date and time XML to JSON ConverterPaste XML or open a file to convert it into clean, readable JSON Binary to Decimal ConverterConvert a binary number (0s and 1s) to its decimal value CSS MinifierCompress your stylesheet for faster page loads by removing comments, whitespace and… Decimal to Binary ConverterConvert any whole number into binary Hex to Decimal ConverterConvert hexadecimal values (0–9, A–F) to decimal numbers IP Subnet CalculatorEnter an IP address with a CIDR prefix to see the network, broadcast, mask and usable… JavaScript MinifierMake JavaScript files smaller with Terser, the minifier used by most modern build tools SHA-256 Hash GeneratorCalculate SHA-256 hashes and verify that downloaded files match their published… Decimal to Hex ConverterConvert decimal numbers to hexadecimal for programming, colours and networking HTML FormatterTurn minified or messy HTML into clean, properly indented markup that is easy to read… HTML MinifierShrink HTML by removing comments and unnecessary whitespace, without touching scripts… JSON to XML ConverterTurn JSON objects and arrays into well-formed, indented XML JavaScript BeautifierMake minified JavaScript readable again with proper indentation and line breaks Markdown to HTML ConverterWrite or paste Markdown and get clean HTML with a live preview SQL FormatterMake long, one-line SQL queries readable with proper line breaks, indentation and… YAML to JSON ConverterConvert YAML configuration files into JSON and catch indentation errors CSS BeautifierUnminify compressed CSS into readable code with one property per line Chmod CalculatorTick permissions or type 755 / rwxr-xr-x to get the chmod command for Linux and hosting… HTML to Markdown ConverterConvert HTML into clean Markdown for README files, documentation and static site… JSON to YAML ConverterTurn JSON into tidy YAML for configuration files Random String GeneratorCreate random strings, tokens and codes in bulk with your choice of characters CSS Border Radius GeneratorGenerate independent corner radii for a CSS box CSS Box Shadow GeneratorCreate a CSS shadow with offsets, blur and opacity CSS Comment & Whitespace CleanerRemove CSS comments and compact excess whitespace CSS Fluid Type GeneratorBuild a clamp expression for responsive font sizing CSS Linear Gradient GeneratorGenerate a two-color CSS linear gradient CSV Column SelectorExtract named columns from a CSV file or reorder them CSV Delimiter ConverterConvert comma, semicolon or tab-separated data CSV to JSON ConverterParse CSV rows into JSON objects using the header row Color Contrast CheckerCalculate WCAG contrast between two opaque colors Cron Expression ExplainerExplain the five fields of a standard cron schedule HTML Entity Encoder & DecoderEscape HTML-sensitive characters or decode HTML entities HTTP Header ParserConvert pasted HTTP response headers into structured JSON JSON to CSV ConverterConvert an array of JSON objects into a CSV table JWT Header & Payload DecoderInspect the readable header and payload of a JWT Query String ParserInspect URL parameters, including repeated keys URL Parts InspectorSplit a URL into protocol, host, path, query and fragment Unicode Escape ConverterConvert text to JSON-style Unicode escapes and back XML Formatter & ValidatorValidate well-formed XML and add readable line breaks