Developer Tools

90 tools — all free, all in-browser.

Folder Structure GeneratorBuild folder structure diagrams, ASCII directory trees, and file tree visualizations for READMEs and docs.Use Tool →.gitignore GeneratorGenerate merged .gitignore rules for your stack with one click.Use Tool →JSON to TypeScript InterfaceConvert JSON into TypeScript interfaces with inferred nested types.Use Tool →Text to Slug ConverterConvert titles and phrases into clean SEO-friendly URL slugs.Use Tool →UTM BuilderBuild campaign URLs with UTM parameters for analytics tracking.Use Tool →JSON Formatter & ValidatorValidate, format, and minify JSON directly in your browser.Use Tool →Regex TesterTest regular expressions with live matches and flag controls.Use Tool →Base64 Encode/DecodeEncode text to Base64 and decode Base64 back to plain text.Use Tool →JWT DecoderDecode JWT headers and payload claims directly in your browser.Use Tool →Markdown Table GeneratorConvert CSV or TSV rows into clean Markdown tables for docs.Use Tool →CSV to JSON ConverterConvert CSV or TSV rows into JSON objects with instant output.Use Tool →JSON to CSV ConverterConvert JSON arrays of objects into CSV rows for spreadsheets.Use Tool →Diff CheckerCompare two texts line by line to spot additions and removals.Use Tool →Case ConverterConvert text into camelCase, snake_case, kebab-case, and more.Use Tool →URL Encoder/DecoderEncode unsafe URL characters and decode percent-encoded strings.Use Tool →UUID GeneratorGenerate random UUID v4 values in bulk with quick copy actions.Use Tool →Hash Generator (SHA)Generate SHA hashes (SHA-1, SHA-256, SHA-384, SHA-512) from text.Use Tool →SQL FormatterFormat and minify SQL queries with keyword casing options.Use Tool →XML FormatterValidate, format, and minify XML with copy-ready output.Use Tool →YAML FormatterValidate, format, and minify YAML with clean indentation.Use Tool →TOML FormatterValidate, format, and minify TOML config text quickly.Use Tool →INI FormatterValidate, format, and minify INI configuration files.Use Tool →CSV FormatterValidate and normalize CSV with delimiter conversion support.Use Tool →CRON Expression ExplainerTranslate 5-field cron schedules into plain-English descriptions.Use Tool →Git Branch Name GeneratorGenerate clean branch names from ticket titles and naming conventions.Use Tool →HTTP Status Code ReferenceSearch HTTP response codes with meanings and common troubleshooting causes.Use Tool →Subnet / CIDR CalculatorCalculate IPv4 network, broadcast, and host ranges from CIDR input.Use Tool →Number Base ConverterConvert between binary, octal, decimal, and hexadecimal in real time.Use Tool →HTML Formatter & MinifierBeautify HTML with proper indentation or minify it to reduce file size.Use Tool →Image to Base64 ConverterUpload any image and get the Base64 data URI for embedding in HTML or CSS.Use Tool →Markdown PreviewWrite Markdown and see the live rendered HTML preview side by side.Use Tool →Text to Binary ConverterConvert text to binary, hex, octal, and decimal — or decode binary back to text.Use Tool →Scientific CalculatorFull scientific calculator with sin, cos, tan, log, ln, sqrt, powers, and calculation history.Use Tool →Caesar Cipher & ROT13Encode or decode text with a Caesar cipher at any shift value, use ROT13, or brute-force all 26 shifts at once.Use Tool →Meta Tag GeneratorGenerate SEO meta tags, Open Graph, and Twitter Card HTML tags for your web page with a live copy-ready preview.Use Tool →JSON to YAML ConverterPaste any valid JSON and instantly get clean, properly indented YAML output. Supports nested objects, arrays, and all types.Use Tool →URL ParserBreak any URL into its components — protocol, hostname, port, pathname, query parameters, and fragment hash. Copy any part instantly.Use Tool →XML to JSON ConverterConvert XML to JSON instantly in your browser. Handles attributes, nested elements, and repeated sibling tags as arrays.Use Tool →Fake Data GeneratorGenerate realistic fake test data — names, emails, usernames, phone numbers, addresses, UUIDs, and more. Export as TSV or JSON.Use Tool →Key Code TesterPress any key to see its JavaScript event properties: key, code, keyCode, which, and modifier states. Instantly debug keyboard events.Use Tool →Markdown to HTMLConvert Markdown to clean HTML instantly. Supports headings, bold, italic, links, code blocks, lists, and blockquotes with a live preview.Use Tool →Text Encryptor / DecryptorEncode and decode text using classic ciphers — Vigenère, ROT13, and Atbash. Runs entirely in your browser with no data sent to a server. Swap input and output in one click.Use Tool →ASCII Table ReferenceComplete ASCII character table (0–127) with decimal, hexadecimal, octal, and binary values. Search by character, name, or code. Click any printable character to copy it.Use Tool →Bitwise CalculatorPerform bitwise AND, OR, XOR, NOT, left shift, and right shift on two numbers. View the 16-bit binary representation for every result. Supports decimal, binary, and hex input.Use Tool →IP Address AnalyzerAnalyze any IPv4 address — view binary representation, IP class, private/public status, subnet mask, and CIDR notation. Perfect for networking and DevOps tasks.Use Tool →Ohm's Law CalculatorCalculate voltage, current, resistance, or power using Ohm's Law. Enter any two known values — the calculator solves for the remaining quantities with full formula reference.Use Tool →CSS MinifierMinify CSS online — remove comments and whitespace to compress your stylesheet. Paste your CSS and get the minified version instantly with file size stats.Use Tool →JavaScript MinifierMinify JavaScript online — remove comments and collapse whitespace to reduce file size. Configurable options including console.log removal. Runs in your browser.Use Tool →HTML to Markdown ConverterConvert HTML to Markdown instantly. Supports headings, links, images, tables, lists, code blocks, blockquotes, bold, and italic. Paste HTML and get clean Markdown output.Use Tool →Robots.txt GeneratorGenerate a valid robots.txt file for your website. Add user-agent rules, disallow and allow paths, and sitemap URL. Quick presets for common configurations.Use Tool →Sitemap XML GeneratorGenerate a valid XML sitemap for your website. Add URLs with priority and change frequency, bulk-import URLs, and download as sitemap.xml instantly.Use Tool →SVG to PNG ConverterConvert SVG to PNG online. Upload an .svg file or paste SVG code, set the output scale, and download a crisp PNG. Runs entirely in your browser.Use Tool →Image Format ConverterConvert images between PNG, JPEG, and WebP in your browser. Upload any image, choose output format and quality, and download the converted file instantly.Use Tool →Tournament Bracket GeneratorCreate single-elimination tournament brackets online. Add teams, generate the bracket, and click to advance winners round by round. Print or screenshot to save.Use Tool →Word Search MakerGenerate custom word search puzzles. Enter your words, choose a grid size (10×10, 15×15, or 20×20), and create a printable word search with horizontal, vertical, and diagonal hidden words.Use Tool →Binary CalculatorAdd, subtract, and multiply binary numbers, or perform AND, OR, XOR bitwise operations. See results in binary, decimal, and hex with step-by-step working.Use Tool →CSS Specificity CalculatorInstantly calculate the specificity of any CSS selector. See the (A,B,C) score, compare two selectors, and understand which CSS rule wins.Use Tool →Open Graph PreviewPreview how your page looks when shared on Twitter/X, Facebook, and LinkedIn. Enter title, description, image URL, and site name to see live social card mockups — no URL fetching needed.Use Tool →JSON Schema GeneratorGenerate a JSON Schema (Draft 7) from any JSON example. Paste your JSON and get a valid schema with inferred types for objects, arrays, strings, numbers, booleans, and nested structures.Use Tool →CSS Media Query GeneratorGenerate responsive CSS media queries with custom breakpoints. Use Tailwind or Bootstrap presets, switch between mobile-first and desktop-first strategies, and copy the CSS output.Use Tool →JSONPath TesterTest JSONPath expressions against JSON data in real time. Query with dot notation, wildcards, array slices, and filter expressions — see matching results highlighted instantly in your browser.Use Tool →Credit Card ValidatorValidate any credit card number using the Luhn algorithm. Instantly detect the card network (Visa, Mastercard, Amex, Discover) and check whether the number passes the checksum. 100% client-side.Use Tool →HTML to Plain Text ConverterStrip HTML tags and convert HTML to clean readable plain text. Options to preserve line breaks, decode HTML entities, and collapse whitespace. Useful for copying web content or cleaning scraped data.Use Tool →HMAC GeneratorGenerate HMAC signatures using SHA-256, SHA-384, or SHA-512 — entirely in your browser.Use Tool →Basic Auth GeneratorGenerate Base64-encoded Basic Authentication headers from a username and password instantly.Use Tool →JSON to XML ConverterConvert JSON objects to well-formatted XML markup instantly in your browser.Use Tool →YAML to JSON ConverterConvert YAML to JSON instantly — paste your YAML and get clean, formatted JSON output.Use Tool →User-Agent ParserParse any user-agent string and extract browser, OS, engine, and device information.Use Tool →MIME Types ReferenceLook up MIME types by file extension or search by content type — a complete reference for developers.Use Tool →Random Port GeneratorGenerate random network port numbers outside the well-known range (1024–65535) for development and testing.Use Tool →ULID GeneratorGenerate Universally Unique Lexicographically Sortable Identifiers (ULIDs) for time-ordered unique IDs.Use Tool →RSA Key Pair GeneratorGenerate RSA public and private key pairs in PEM format directly in your browser using Web Crypto API.Use Tool →YAML to TOMLConvert YAML configuration files to TOML format instantly in your browser.Use Tool →JSON to TOMLConvert JSON objects to TOML configuration format instantly in your browser.Use Tool →TOML to JSONConvert TOML configuration files to JSON format instantly in your browser.Use Tool →TOML to YAMLConvert TOML configuration files to YAML format instantly in your browser.Use Tool →OTP Code GeneratorGenerate and verify TOTP one-time passwords for testing multi-factor authentication flows in your browser.Use Tool →JSON DiffCompare two JSON objects and visually highlight the differences — added, removed, and changed keys.Use Tool →Git CheatsheetQuick reference for the most common Git commands — setup, branching, merging, stashing, and more.Use Tool →JSON MinifyRemove all whitespace from JSON to produce the smallest possible output for APIs and storage.Use Tool →Chmod CalculatorCalculate Unix file permission values — click checkboxes to build chmod values and see the octal and symbolic representations.Use Tool →Docker Run to ComposeConvert docker run commands into docker-compose.yml service definitions instantly.Use Tool →IPv4 Address ConverterConvert an IPv4 address to decimal, binary, hexadecimal, and IPv6 representations instantly.Use Tool →IPv4 Range ExpanderEnter a start and end IPv4 address to get the covering CIDR block, subnet mask, and address count.Use Tool →MAC Address GeneratorGenerate random MAC addresses in various formats with optional OUI prefix for network testing.Use Tool →IPv6 ULA GeneratorGenerate RFC 4193 IPv6 Unique Local Addresses (ULA) for private networks — fc00::/7 range.Use Tool →String ObfuscatorPartially mask a string — like a token, IBAN, or API key — to share it safely without revealing the full value.Use Tool →Benchmark BuilderMeasure and compare the execution time of JavaScript code snippets directly in your browser.Use Tool →Regex CheatsheetA complete JavaScript regex cheatsheet — anchors, character classes, quantifiers, groups, flags, and common patterns.Use Tool →Base64 File ConverterConvert any file to Base64 and decode Base64 strings back to downloadable files — entirely in your browser.Use Tool →