Developer Tools
Free developer utilities: JSON, XML, and SQL formatters, JWT and URL parsers, cron and chmod helpers, docker-run converters, and more — all private, all in your browser.
URL Encoder & Decoder Online Percent-encode text for safe use in URLs or decode escaped URL components back to readable text. Free, instant, and fully in-browser. HTML Entity Encoder & Decoder Escape HTML special characters or decode named, decimal, and hexadecimal entities back to text. Free, private, and browser-based. URL Parser & Query String Inspector Break a URL into protocol, credentials, host, port, path, query parameters, hash, and origin. Free, standards-based, and in-browser. HTTP Basic Auth Header Generator Generate a complete HTTP Basic Authorization header from a username and password, with Unicode-safe base64 encoding in your browser. Meta Tag & Open Graph Generator Generate escaped HTML title, description, Open Graph, and Twitter Card tags from page details. Free and generated in your browser. MIME Type & File Extension Lookup Find MIME types from file extensions or search registered media types for extensions, charset, and content-type details. Free and instant. JWT Decoder & Parser Online Decode JWT header and payload JSON plus the raw signature section without uploading the token. Free, private, and browser-only. String Slug Generator Online Turn titles and phrases into clean lowercase URL slugs with transliteration, word separation, and punctuation removal. Free and instant. User-Agent Parser Online Parse a browser User-Agent string into browser, version, rendering engine, operating system, device, and CPU details in-browser. HTTP Status Codes Reference Search standard HTTP response codes by number, reason phrase, or category, including WebDAV and modern extension statuses. Free reference. Outlook Safe Links URL Decoder Extract the original destination URL from a Microsoft Outlook Safe Links protection URL. Free, validated, and decoded in your browser. Git Command Cheat Sheet Search practical Git commands for setup, changes, history, branches, remotes, stashes, tags, and debugging. Free copy-ready reference. Random TCP/UDP Port Generator Generate a cryptographically random port within custom bounds from 0 to 65535, defaulting to the non-privileged range. Free and local. Cron Expression Validator & Explainer Validate five-field cron expressions and translate schedules into readable English using 24-hour time. Free, instant, and in-browser. JSON Minifier Online Remove whitespace and comments from JSON or JSON5 input to produce compact valid JSON. Free, validated, and processed in your browser. SQL Formatter & Prettifier Online Format SQL with uppercase keywords and readable indentation across MySQL, PostgreSQL, SQLite, BigQuery, T-SQL, and more dialects. XML Formatter & Beautifier Online Format compact XML with configurable indentation while preserving text content and validating document structure. Free and in-browser. Chmod Permissions Calculator Convert Unix read, write, and execute checkboxes into octal and symbolic permissions, or enter octal to update the matrix. Free and live. Docker Run to Compose Converter Convert a docker run command into Docker Compose YAML, including ports, volumes, environment variables, names, and common flags. Email Address Normalizer Online Normalize email addresses one per line for consistent comparison, including provider-specific casing, dots, and aliases. Free and private. Regular Expression Cheat Sheet Search regex syntax for character classes, anchors, quantifiers, groups, lookarounds, backreferences, and flags. Free copy-ready guide. Browser & Device Information Inspect screen, window, orientation, pixel ratio, languages, platform, CPU cores, online status, and User-Agent data from your browser. Keyboard Keycode Event Inspector Press any keyboard key to inspect its key, code, legacy keyCode, location, and active modifier keys. Free and entirely browser-based. TOTP Code Generator & Validator Generate current, previous, and next TOTP codes from a base32 secret, verify tokens, and scan an authenticator QR code. Browser-only. HTML WYSIWYG Editor Online Edit rich text with headings, lists, bold, italic, code, quotes, undo, and redo while viewing and copying the generated HTML source. JSON Diff & Object Comparison Compare two JSON or JSON5 values and list every added, removed, or changed path with before-and-after values. Free and in-browser. Regex Tester, Matcher & Diagram Test JavaScript regular expressions with flags, captures, named groups, match indices, generated examples, and a lazy-loaded SVG diagram. JSON Tree Viewer Online Parse JSON5 input and explore nested objects and arrays in a collapsible tree, with optional recursive key sorting. Free and private. YAML Tree Viewer Online Parse YAML and explore maps, sequences, and scalar values in a collapsible browser tree, with optional recursive key sorting.