Developer Tools
JSON, Base64, hashing and other dev utilities.
JSON Formatter Free online JSON formatter to beautify, validate and minify JSON in your browser. A live two-pane tool with a Beautify/Minify toggle and a collapsible tree view. Private, no upload, no sign-up. Paste JSON, get clean output, copy or download. Hash Generator Free online hash generator. Paste text to get MD5, SHA-1, SHA-256 and SHA-512 hashes instantly, all in your browser. No upload, no sign-up, fully private. Regex Tester Free online regex tester. Type a pattern and flags, paste your text, and see every match with its index and capture groups live. Runs in your browser. HTML Encode / Decode Free HTML encoder and decoder. Convert characters like &, <, > and quotes into HTML entities or decode entities back to plain text, right in your browser. Markdown Preview Free live Markdown preview tool. Type Markdown, see rendered HTML side by side instantly in your browser. Private, no upload, no sign-up. JWT Decoder Free online JWT decoder. Paste a JSON Web Token to instantly read its header and payload as clean JSON. Runs in your browser, nothing is uploaded. Color Converter Pick a color or type a HEX code and instantly get HEX, RGB, HSL and CMYK, each one click to copy, with a live swatch. Runs in your browser, no sign-up. SQL Formatter Free online SQL formatter that beautifies messy queries in your browser. Uppercase keywords, line breaks per clause, indented columns. No upload, no sign-up. Diff Checker Compare two blocks of text online and see added and removed lines instantly. Free diff checker that runs in your browser, no sign-up, your data stays private. CSS Minifier Free online CSS minifier that compresses stylesheets in your browser. Remove comments and whitespace to shrink CSS file size and speed up your site. No upload. JavaScript Minifier Free online JavaScript minifier that shrinks JS file size by removing comments and whitespace. Runs in your browser, no upload, no sign-up, instant and private. HTML Minifier Free online HTML minifier. Paste your markup to strip comments and extra whitespace, shrink file size and load pages faster. Runs in your browser, no upload. URL Parser Free online URL parser. Paste any link to instantly break it into protocol, host, port, path, query string and fragment. Works in your browser, no sign-up. JSON to TypeScript Convert any JSON object or array into clean TypeScript interfaces with a live two-pane editor. Paste your JSON on the left, get typed interfaces with nested types on the right as you type, all in your browser. HTTP Status Codes Free HTTP status code lookup. Type a code like 404 or a keyword like timeout to instantly see the meaning and category. Runs in your browser, no upload. Subnet Calculator Free online IP subnet calculator. Type an IPv4 address in CIDR form to instantly get the network, netmask, wildcard, broadcast and usable host range. No sign-up. User Agent Parser Free online user agent parser. Paste any user agent string to instantly detect the browser, operating system and device type. Runs in your browser, no sign-up. HTML to Markdown Convert HTML into clean Markdown instantly in your browser. Handles headings, bold, italic, links, images, lists, inline code, and blockquotes. Free, private, no upload. Cron Explainer Free online cron expression explainer. Paste a 5-field cron expression and read it in plain English instantly. Runs in your browser, nothing is uploaded. Password Strength Free online password strength checker. Type a password to instantly rate its strength, estimate entropy in bits, see its length, and get tips. All local, nothing uploaded. CSS Gradient Build smooth CSS gradients with a live preview and copy ready-to-paste code. Choose linear or radial, set the angle, and pick two colors instantly. Box Shadow Build a CSS box-shadow visually with a live preview and copyable code. Adjust offset, blur, spread, opacity and color, toggle inset, then copy the rule. Border Radius Shape rounded corners visually with one slider per corner, watch a live preview update, then copy the exact CSS border-radius rule. Free and runs in your browser.