🛠️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 ASCII table with decimal, hex, octal and binary codes for all 128 characters. Search by code or character, see control-code names, and click to copy any value. 📐 Aspect Ratio Calculator Free aspect ratio calculator. Resize an image or video while keeping the same 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) and padding, then decode it back to text in your browser. 🔣 Base58 Encoder Decoder Free Base58 encoder and decoder. Convert text to Base58 using the Bitcoin alphabet (no 0, O, I, or l), then decode it back to text right in your browser. 🔤 Base64 Encode Decode Free Base64 encoder and decoder. Convert text to Base64 and decode Base64 back to text, with full UTF-8 support, URL-safe output, and a copy button. Runs in your browser. 🔐 Chmod Calculator Free chmod calculator: tick read, write, and 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-browser. ⏰ Cron Expression to Text Free cron expression to text translator. Paste a crontab line and get a plain English description plus a field-by-field breakdown, with range and step support. 🎞️ CSS Keyframes Animation Generator Free CSS animation generator: pick a keyframes preset (fade, slide, bounce, spin, pulse), set duration, timing, iterations and direction, then copy the 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 to copy. 🧱 CSS Grid Generator Free CSS grid generator: set columns, rows and gap to build display:grid CSS with repeat() and fr units, see a live preview of the cells, and copy the layout. 🎨 CSS Minifier Free CSS minifier: paste your CSS to remove comments, collapse whitespace, and strip needless characters. See the size 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 the property, duration, timing function and delay, then watch a live hover preview and copy the ready-to-use CSS code. 🧩 CSV to HTML Table Free CSV to HTML table converter. Paste CSV, pick a delimiter and header row, and get clean escaped thead/tbody markup with copy and a live rendered preview. 🔀 CSV to JSON Free CSV to JSON converter. Paste CSV, pick a delimiter, and get a pretty-printed JSON array of objects. Handles quoted fields and commas inside quotes. 📋 CSV to Markdown Table Free CSV to Markdown table converter. Paste CSV, pick a delimiter and column alignment, and get a clean GitHub-flavored Markdown table to copy in one click. 🕐 Discord Timestamp Generator Free Discord timestamp generator: pick a date and time to build the t:UNIX:STYLE chat code for every Discord style, with a live preview of how each renders. 📐 Flexbox Generator Free CSS flexbox generator with a live playground. Adjust flex-direction, justify-content, align-items, wrap and gap, then copy the generated flex layout CSS. 🔐 Hash Generator Free online hash generator. Paste text and get SHA-1, SHA-256, and SHA-512 hex digests instantly, with one-click copy. Runs fully 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 Entity Encoder Free HTML entity encoder and decoder. Escape <, >, &, and quotes to safe entities, optionally encode all non-ASCII, then decode entities back to plain text. 🗜️ HTML Minifier Free HTML minifier. Paste HTML to remove comments, collapse whitespace, and trim gaps between tags. 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 HTML table code with thead and tbody, plus a live preview. 🚦 HTTP Status Codes Free HTTP status code reference: search and browse every code from 1xx to 5xx with its name and meaning. Find out what a 404, 301, or 500 error means fast. 🌐 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. Enter an IPv4 address and CIDR prefix to get the network address, broadcast, subnet mask, wildcard, usable host range and host count. 🔀 JSON Diff Free JSON diff checker. Paste two JSON snippets to compare them and instantly see every added key, removed key and changed value, listed with its exact path. 🔣 JSON Escape Unescape Free JSON escape and unescape tool. Escape any string into a valid JSON string value, or unescape a JSON string back to raw text instantly in your browser. 🧩 JSON Formatter Free JSON formatter, validator and beautifier. Paste JSON to pretty-print with 2 or 4 space indent, minify to one line, or validate and see the exact parse error. 🔤 JSON Key Sorter Free JSON key sorter. Recursively sort JSON object keys alphabetically (A to Z or Z to A), preserve array order, pretty-print the result and copy it instantly. 🗂️ JSON to CSV Free JSON to CSV converter. Paste a JSON array of objects and get clean, properly quoted CSV you can copy or download. Runs in your browser, nothing uploaded. 🧩 JSON to TypeScript Free JSON to TypeScript interface generator. Paste a JSON object or array and instantly get clean TypeScript interfaces with inferred types and nested objects. 🔁 JSON to XML Free JSON to XML converter. Paste JSON and convert to clean, escaped, pretty printed XML in your browser. Set a custom root and array item name. No upload. 🔁 JSON to YAML Free JSON to YAML converter. Paste JSON and get clean, indented YAML instantly. Handles nested objects, arrays, and smart quoting. Runs in your browser. 🔐 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 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. 🖥️ 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. 🗄️ 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 and decoder. Convert text to percent-encoding and back instantly. Encode spaces, ampersands, and accents for safe URLs, then copy with one click. 🕵️ 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 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.