🛠️Developer Tools
Free developer tools: JSON formatter, Base64 encode/decode, URL encoder, hash generator, JWT decoder, regex tester and more. Runs locally, your data stays private.
🔤 ASCII Table Full ASCII table reference with decimal, hex, octal, binary and HTML codes for all 128 characters. Search by code or character, see control codes, click to copy. 📐 Aspect Ratio Calculator Free aspect ratio calculator to resize images and video while keeping the ratio, find a missing width or height, and reduce sizes like 1920x1080 to 16:9. 🔠 Base32 Encoder Decoder Free Base32 encoder and decoder. Convert text to Base32 with the RFC 4648 alphabet (A-Z and 2-7) plus padding, then decode it back. Full UTF-8, runs in your browser. 🔣 Base58 Encoder Decoder Free Base58 encoder and decoder online. Convert text to Base58 with the Bitcoin alphabet (no 0, O, I, l) and decode it back instantly, all in your browser. 🔤 Base64 Encode Decode Free Base64 encode and decode tool. Convert text to Base64 and decode it back instantly, with full UTF-8 support, URL-safe output, and one-click copy in your browser. 🔡 Binary to English Translator Free binary to English translator. Paste space separated 8-bit binary and instantly decode it to readable English text using ASCII. Live, private, in browser. 🔢 Binary Translator Free binary translator that converts text to binary and binary back to text instantly. Live two-way conversion, 8-bit groups, copy button, 100% in your browser. 🔘 CSS Button Generator Free button maker with live preview. Set text, colors, radius, padding, border, shadow, and hover, then copy clean CSS and HTML instantly. No sign-up needed. 🔐 Chmod Calculator Free chmod calculator: tick read, write, execute for owner, group, and other to get the octal value (like 755) and symbolic string (rwxr-xr-x) instantly. 💳 Credit Card Validator Free credit card validator. Paste a number to run the Luhn checksum and detect the brand: Visa, Mastercard, Amex, Discover. Checks the maths only, in your browser. ⏰ Cron Expression to Text Cron to text translator: paste any crontab line and get a plain English description plus a field-by-field breakdown, with range, list, step and macro help. 🎞️ CSS Keyframes Animation Generator Free CSS animation generator: pick a keyframes preset (fade, slide, bounce, spin, pulse), set duration, easing, delay, iterations and direction, then copy clean CSS. 📐 CSS Clamp Generator Free CSS clamp generator for fluid typography. Enter min and max font size plus viewport widths to get a responsive clamp() value in rem and vw, with a live preview. 🧱 CSS Grid Generator Free CSS grid generator: set columns, rows and gap to build display:grid code with repeat() and fr units, preview the cells live, and copy clean CSS in seconds. 🎨 CSS Minifier Free CSS minifier that removes comments and whitespace to shrink your stylesheet 20 to 50 percent. Paste CSS, see the bytes saved, and copy the minified output. 🎯 CSS Specificity Calculator Free CSS specificity calculator. Paste any selector to get its (a, b, c) score, see how IDs, classes and elements stack up, and learn which rule actually wins. 🎞️ CSS Transition Generator Free CSS transition generator: set property, duration, timing function and delay, watch a live hover preview, then copy the ready-to-use transition shorthand. 🧩 CSV to HTML Table Free CSV to HTML table converter. Paste CSV, pick a delimiter and header row, and get clean escaped thead and tbody markup with a live preview and copy button. 🔀 CSV to JSON Free CSV to JSON converter. Paste CSV, pick a delimiter, and get a pretty JSON array of objects. Handles quoted fields, commas in quotes and TSV. Runs in-browser. 📋 CSV to Markdown Table Free CSV to Markdown table converter. Paste CSV, choose the delimiter and column alignment, then copy a clean GitHub-flavored Markdown table in one click. 🔢 Decimal to Text Converter Free decimal to text converter. Turn decimal character codes like 72 105 into readable text, or convert text into Unicode decimal codes instantly in your browser. Dx Diff Checker (Text Compare) Free diff checker that compares two blocks of text line by line and highlights added lines in green and removed lines in red, with a count of each. No signup. 🕐 Discord Timestamp Generator Free Discord timestamp generator: pick any date and time to build the t:UNIX:STYLE code for all 7 Discord styles, with a live preview of how each one renders. ⏱️ Download Time Calculator Free download time calculator: enter file size and speed to see exactly how long a download takes. Supports Mbps, Gbps, MB/s, KB, GB and TB instantly. 📐 Flexbox Generator Free CSS flexbox generator with live preview. Set flex-direction, justify-content, align-items, wrap, gap, grow and shrink, then copy clean flexbox CSS instantly. 🎮 FPS Counter Free online FPS counter measures your browser frame rate live. See current FPS plus average, min, max and your monitor refresh rate. No install, fully private. 🎨 CSS Gradient Generator Free CSS gradient generator to build linear and radial gradients visually. Pick colors, set the angle, preview live, and copy the background code instantly. 🔐 Hash Generator Free online hash generator. Paste text to get SHA-1, SHA-256, and SHA-512 hex digests instantly, with one-click copy. Runs in your browser, nothing is uploaded. 🔣 Hex Dump Viewer Free hex dump viewer. Paste text to get a classic hexdump with an offset column, 16 hex byte columns and an ASCII gutter, encoded as UTF-8 bytes, in-browser. 🔐 HMAC Generator Free online HMAC generator. Compute HMAC SHA-256, SHA-1, and SHA-512 hex digests from a message and secret key, fully in your browser with no data sent. 🧹 HTML Beautifier Free HTML beautifier that formats minified or messy markup into clean, indented HTML instantly. Choose 2 spaces, 4 spaces, or tabs, then copy the result. 🔣 HTML Entity Encoder Free HTML entity encoder and decoder. Escape <, >, &, and quotes to safe entities, encode all non-ASCII characters, then decode entities back to plain text. 🗜️ HTML Minifier Free HTML minifier, strips comments and whitespace to shrink markup in your browser instantly. See original vs minified size and percent saved, then copy. 📊 HTML Table Generator Free HTML table generator: set rows, columns and headers, fill in the grid, then copy clean table code with thead, tbody, colspan and rowspan support. <> HTML to Markdown Converter Convert HTML to Markdown online for free. Paste any HTML and get clean Markdown with headings, tables, lists, links, images and code, right in your browser. 🚦 HTTP Status Codes Look up every HTTP status code from 100 to 599, including 404, 500, 429, and rarer ones. See exactly what each code means, why it happens, and how to fix it. 🌐 IP Address Validator Free IP address validator. Check whether a string is a valid IPv4 or IPv6 address, see the version, IPv4 class, and whether it is private, public, or reserved. 🌐 IP Subnet Calculator Free IP subnet calculator for IPv4 CIDR. Enter an address and prefix to get the network, broadcast, subnet mask, wildcard, usable host range and host count. 🔍 JavaScript Deobfuscator and Beautifier Free javascript deobfuscator that decodes hex, unicode and URI escapes, expands String.fromCharCode, and reindents minified code. No eval, runs in your browser. 🔀 JSON Diff Free JSON diff checker that compares two JSON objects and lists every added key, removed key, and changed value with its exact path, all in your browser. { } JSON Editor and Validator Free online JSON editor with live validation, instant error messages, format and minify, plus key count, nesting depth, and byte size stats. Nothing uploaded. 🔣 JSON Escape Unescape Free JSON escape tool: convert quotes, backslashes, newlines and tabs into valid JSON strings, or unescape them back, right in your browser with no upload. 🧩 JSON Formatter Free JSON formatter and validator. Paste JSON to pretty print with 2 or 4 space indent, minify to one line, or validate and see the exact parser error. Runs in your browser. 🔤 JSON Key Sorter Sort JSON keys alphabetically online, free and instant. Recursively reorders nested objects A-Z or Z-A, keeps array order intact, then copy the clean result. 🗂️ JSON to CSV Convert JSON to CSV free and instantly. Paste a JSON array, get quoted CSV with headers, then copy or download. Runs in your browser, nothing is uploaded. 🔤 JSON to Text Converter Convert JSON to text free online. Beautify with 2 or 4 space indent, minify to one line, or flatten to plain dot.path: value text, then copy the result. 🧩 JSON to TypeScript Free JSON to TypeScript interface generator. Paste JSON, get typed interfaces with nested objects, arrays, unions, and optional fields, instantly and privately. 🔁 JSON to XML Convert JSON to XML online for free. Paste JSON and get clean, escaped, pretty printed XML with a custom root and item element name. Nothing is uploaded, ever. 🔁 JSON to YAML Free JSON to YAML converter that runs in your browser. Paste JSON and get clean, indented YAML with smart quoting for Kubernetes, Docker, and CI/CD configs. ✅ JSON Validator Free online JSON validator. Paste JSON to check it is valid, see the parser error with line and column, get a pretty-printed copy, plus key and depth stats. 🔐 JWT Decoder Free JWT decoder. Paste a JSON Web Token to decode its header and payload, pretty-print the JSON, and read exp and iat dates. Runs in your browser, no upload. ⌨️ JavaScript Keycode Finder Free JavaScript keycode finder. Press any key to instantly see its event.key, event.code, legacy keyCode, location and the modifier keys being held down. 🧩 Lorem Ipsum HTML Generator Free Lorem Ipsum HTML generator: create placeholder content wrapped in real HTML tags, with headings, lists, blockquotes and links. Copy the source instantly. 🔌 MAC Address Generator Free MAC address generator. Create random MAC addresses with colon, hyphen or dot formatting, upper or lowercase, set the locally-administered bit, copy in bulk 📋 Markdown Table Generator Free Markdown table generator. Fill an editable grid, set column alignment, and instantly get clean GitHub-flavored Markdown table syntax with a live preview. 📝 Markdown to HTML Free Markdown to HTML converter. Paste Markdown to instantly preview the rendered output and copy clean HTML: headings, bold, lists, links, code and more. 📄 MIME Type Reference Free MIME type lookup tool. Search any file extension or content type to find the matching MIME type for HTTP headers, web servers, and uploads. Click to copy. 🆔 NanoID Generator Free NanoID generator: create short, URL-safe unique IDs from A-Za-z0-9_- using your browser crypto. Set the length and count, then copy each ID instantly. 🔢 Number Base Converter Free number base converter: type a number in binary, octal, decimal, or hex and the others update instantly. Binary to decimal, decimal to binary, and hex made easy. 📏 PX to EM Converter Free px to em converter for CSS. Convert pixels to em or em to px with an editable base font size, see the rem value, and use a handy 16px reference table. 📐 PX to Points Converter Free px to pt converter: turn CSS pixels into points (and back) using the 96px = 72pt reference. Instant two-way results, em equivalents, and a reference table. 📐 PX to REM Converter Free PX to REM converter for CSS. Convert pixels to rem and rem to px using any base font size (default 16px), see em values, with two-way live fields. 🔗 Query String Parser Free URL query string parser. Paste a URL to list each parameter and its decoded value in a table, or build an encoded query string from key/value pairs. 🔎 Regex Tester Free online regex tester. Enter a pattern, set g, i, m or s flags, and instantly see highlighted matches, capture groups and the match count in your browser. 🎨 Resistor Color Code Calculator Free resistor color code calculator. Pick the bands and colours to read resistance in ohms, the tolerance range, and the temperature coefficient for 6 band parts. 🖥️ Screen Resolution Checker Free screen resolution checker. Instantly see your screen size, browser viewport, device pixel ratio, color depth, and orientation, updating live as you resize. 🔢 Semver Comparator Free semver comparator: enter two semantic versions to see which is greater or if equal. Validates the format and shows major, minor, patch and prerelease. 🔗 Slug Generator Free slug generator that turns any title into a clean, SEO friendly URL slug. Strip accents, pick hyphen or underscore, cap the length, then copy it instantly. 🗄️ SQL Formatter Free SQL formatter and beautifier. Paste a query to uppercase keywords, break clauses onto new lines, indent, and split columns, or minify it, all in-browser. 🔀 Text Diff Checker Free text diff checker: paste two versions of any text and see added, removed, and unchanged lines highlighted, with a count of every change. Runs in-browser. 🆔 ULID Generator Free ULID generator. Create one or many 26-character ULIDs that are lexicographically sortable by time, with a timestamp prefix and crypto-random suffix. 🕒 Unix Timestamp Converter Free Unix timestamp converter: turn an epoch timestamp into a readable UTC and local date, or convert any date back to a Unix timestamp. Live current epoch too. 🔗 URL Encoder / Decoder Free URL encoder decoder. Percent-encode text with encodeURIComponent or encodeURI, or decode any percent-encoded URL back to plain text, instantly in your browser. 🔗 URL Encoder Decoder Free URL encoder and decoder. Convert text to percent-encoding and back instantly. Encode spaces, ampersands, and accents for safe URLs, then copy with one click. 🗂️ URL Opener (Open Multiple URLs) Free URL opener: paste a list of links, one per line, then open all of them in new tabs at once. Add https, remove duplicates, reverse order and copy the clean list. 🕵️ User Agent Parser Free user agent parser: see your own browser's user agent string and parse any UA into browser name, version, operating system, and device type instantly. 🆔 UUID Validator Free UUID validator: check if a string is a well-formed UUID, detect its version (1 to 5) and RFC 4122 variant, and validate a GUID with or without braces. </> XML Formatter Free XML formatter that beautifies messy XML with clean indentation or minifies it to one line. Choose 2 spaces, 4 spaces or tabs, check for unbalanced tags, and copy the result. 🔄 XML to JSON Free XML to JSON converter. Paste XML and get clean, pretty-printed JSON instantly: elements become keys, attributes use a prefix, repeated tags become arrays. 🔁 YAML to JSON Free YAML to JSON converter. Paste YAML and instantly get clean, pretty-printed JSON in your browser. Supports maps, lists, scalars, comments and quotes.
Developers reach for the same small utilities all day: formatting JSON, decoding a token, hashing a string, testing a regex. Our developer tools put them in one fast place that works offline once loaded.
Nothing you paste is uploaded. Every conversion happens in your browser, so it is safe for tokens, payloads and secrets.