Developer Tools
Formatters, encoders, decoders and generators for developers. JSON, JWT, Base64, hashes, UUIDs and regex.
.env to JSON
Convert a .env file to JSON, or JSON back to .env. Parses KEY=value lines, comments, quotes and export. Runs entirely in your browser.
ASCII Table
Full ASCII table for all 128 codes with decimal, hex, octal and binary values, character names and descriptions. Search by code, hex or character.
Aspect Ratio Box Generator
Generate CSS for a responsive aspect-ratio container. Use the modern aspect-ratio property or the padding-top fallback, then copy the ready code.
Aspect Ratio Calculator
Calculate aspect ratios fast. Enter a ratio like 16:9 and one dimension to get the other, or enter width and height to simplify the ratio.
Base32 Encode
Base32 encode and decode text online using the standard RFC 4648 alphabet with proper padding. UTF-8 safe, fast and private in your browser.
Base58 Encoder
Encode and decode Base58 online with the Bitcoin alphabet. Convert text to Base58 or back, UTF-8 safe, no confusing 0 O I l. Runs in your browser.
Base64 Decode
Decode Base64 to plain text online. Paste a Base64 or base64url string and get instant UTF-8 output. Free, fast and runs in your browser.
Base64 Encode
Encode text to Base64 online. UTF-8 safe, handles emoji and accents, with an optional URL-safe (base64url) mode. Runs in your browser, nothing uploaded.
Base64URL Encoder
Encode and decode Base64URL (RFC 4648) in your browser. URL-safe output with - and _ and no padding, UTF-8 round-trips, and decoding tolerates missing padding.
Basic Auth Generator
Generate an HTTP Basic Authorization header from a username and password. Get the base64 value, header line and ready curl commands. Runs in your browser.
Bitwise Calculator
Bitwise AND, OR, XOR, NOT, NAND, NOR, XNOR and shifts on 8, 16, 32 or 64 bit integers. See every operand in binary, hex, octal and signed decimal.
Border Radius Generator
Round corners visually with four sliders, then copy the border-radius CSS. Includes a blob mode for organic shapes with a live preview.
Box Shadow Generator
Build CSS box-shadow visually. Drag sliders for offset, blur, spread, color and opacity, see a live preview, and copy the box-shadow code.
Browserslist Generator
Generate a .browserslistrc file online. Pick a preset, target browser versions, set coverage and exclude dead or old browsers. Free and private.
Chmod Calculator
Convert Unix file permissions between octal (755), symbolic (rwxr-xr-x) and a checkbox grid. Get the chmod command instantly, all in your browser.
Color Blindness Simulator
See how any color looks to people with protanopia, deuteranopia, tritanopia, and achromatopsia. Pick a color and compare the swatches live in your browser.
Color Contrast Checker
Check the WCAG contrast ratio between two colors. See AA and AAA pass or fail for normal and large text, with a live preview. Runs in your browser.
Color Harmony Generator
Generate complementary, analogous, triadic, tetradic and split complementary color schemes from one base color. Pick a hex and copy every palette.
Color Palette Generator
Generate complementary, analogous, triadic, tetradic and monochromatic color palettes from one base color. Pick a hex, copy each shade as hex, RGB or HSL.
Commit Message Generator
Build a clean Conventional Commit message. Pick a type, add a scope, description, body, breaking change and issue refs, then copy. Runs in your browser.
CRC32 Calculator
Calculate the CRC32 (IEEE 802.3) and Adler-32 checksum of any text. Live hex and decimal output that runs entirely in your browser.
Credit Card Generator
Generate fake, Luhn-valid test credit card numbers for Visa, Mastercard, Amex and Discover. For testing payment forms only. Not real cards. Free and private.
Cron Expression Explainer
Paste a cron expression to see what it means in plain English plus the next 5 run times. Works fully in your browser, no signup needed.
Cron Expression Generator
Build a cron expression from simple fields and read it back in plain English. Pick a preset or set minute, hour, and day. Free and private.
Cron Next Run Times
Enter a cron expression and a start time to see the next run times in UTC. Runs in your browser, no signup, supports steps, ranges and names.
Crontab Generator
Build a cron expression from simple fields. Pick a preset or set minute, hour, day, month and weekday, then copy the line for your crontab.
CSP Builder
Build a Content-Security-Policy header from per-directive sources. Toggle report-only, report-uri and upgrade, then copy the header, meta tag or nginx line.
CSS Animation Generator
Generate CSS keyframe animations with a live preview. Pick a preset like fade, slide, spin or bounce, tune the timing and copy the @keyframes code.
CSS Clamp Generator
Generate a responsive CSS clamp() value for fluid font sizes and spacing. Set min and max sizes plus viewport bounds and copy the result.
CSS clamp() Calculator
Generate a responsive CSS clamp() for fluid font sizes and spacing. Set a min and max size with viewport breakpoints and copy the clamp() value instantly.
CSS Filter Generator
Build a CSS filter visually. Drag sliders for blur, brightness, contrast, grayscale, sepia and more, see a live preview, and copy the filter code.
CSS Formatter
Beautify and format messy or minified CSS online. Indent rules, put one declaration per line and tidy spacing. Runs in your browser.
CSS Gradient Generator
Build linear and radial CSS gradients with a live preview. Pick colors, set the angle and copy ready-to-paste background code for your site.
CSS Grid Generator
Build CSS grid layouts visually. Set columns, rows, gaps and alignment, watch a live grid preview, and copy clean grid-template code for your project.
CSS Loader Generator
Generate a pure CSS loading spinner with no images or JavaScript. Pick spinner, dots, bars or pulse, set size, color and speed, then copy the code.
CSS Minifier
Minify CSS online to shrink file size. Strips comments and whitespace, keeps your strings and url() values intact, and runs in your browser.
CSS Specificity Calculator
Calculate CSS selector specificity as an (a, b, c) score with a full breakdown. Compare two selectors to see which wins. Runs in your browser.
CSS Transform Generator
Build a CSS transform visually. Drag sliders for translate, rotate, scale and skew, set the origin, watch a live preview and copy the transform code.
CSS Transition Generator
Build a CSS transition shorthand from properties, duration, timing and delay. Add multiple properties or a custom cubic-bezier curve, then copy the code.
CSS Triangle Generator
Make a pure CSS triangle with the border trick. Pick a direction, size and color, see a live preview, and copy the border CSS. No images or SVG.
CSV Column Extractor
Select, reorder or drop CSV columns by name or position. Handles quoted fields with commas and re-quotes output correctly. Free, private, in your browser.
Cubic Bezier Generator
Build a custom CSS cubic-bezier() easing curve by dragging two control points. Preview the animation, pick a preset and copy the timing function.
curl Command Builder
Build a curl command from a URL, method, headers and body. Sets Content-Type for JSON or form data and shell-escapes every value. Free and private.
curl to code
Paste a curl command and get clean JavaScript fetch and Python requests code. Parses method, headers and body. Runs in your browser.
Data URI Generator
Turn text, SVG or HTML into a data: URI. Pick base64 or compact URL encoding and copy ready-made CSS background and HTML img snippets. Runs in your browser.
Diceware Passphrase Generator
Generate a memorable, strong diceware passphrase from random common words. Pick word count, separator, capitals and a number, see the entropy, then copy.
Diff Checker
Compare two texts or files side by side or unified, with word and character highlighting, ignore whitespace or case, collapse unchanged, and .diff export.
DNS Record Explainer
Plain-English reference for DNS record types like A, AAAA, CNAME, MX, TXT, NS and SOA. See the purpose, an example value and practical notes for each.
Docker Compose Generator
Build a valid docker-compose.yml in your browser. Add services, pick Postgres, MySQL, Redis, Mongo or Nginx presets, then copy or download the file.
Dockerfile Generator
Generate a clean, idiomatic Dockerfile for Node, Python, Go, Rust, PHP, Ruby or static sites. Pick your options, then copy or download the file.
Dockerignore Generator
Generate a .dockerignore file online. Combine Node, Python, Go and Java presets with custom patterns, deduplicated, then copy it. Free and private.
dotenv to JSON
Convert a .env file to JSON and JSON back to .env online. Handles comments, the export prefix, quotes and equals signs inside values. Free and private.
EditorConfig Generator
Generate a .editorconfig file online. Set indent style, size, line endings, charset and per-file overrides, then copy the result. Free and private.
Email Header Analyzer
Paste raw email headers to parse them in your browser. Unfold folded lines, see From, To, Subject and Date, count Received hops, and read SPF, DKIM and DMARC.
Env File Validator
Validate a .env file in your browser. Catch missing equals signs, invalid key names, duplicate keys, spaces around equals and unquoted spaced values.
ESLint Config Generator
Generate an ESLint config for JavaScript or TypeScript with React, Vue or Node. Pick a style, set semi, quotes and indent, then copy or download.
Fake Data Generator
Generate realistic fake test data online. Pick fields like name, email and address, set a count and seed, then export to JSON, CSV or SQL. Free and private.
File Hash Generator
Drop in a file to get its SHA-1, SHA-256, SHA-384 and SHA-512 checksums. Compare against an expected hash. Runs in your browser, the file never uploads.
Flexbox Generator
Build CSS Flexbox layouts visually. Set direction, justify, align, wrap and gap, watch a live preview, and copy clean flex-container code.
Gitattributes Generator
Generate a .gitattributes file online. Normalize line endings, track files with Git LFS, mark vendored paths and export-ignore rules. Free and private.
GitHub Actions Generator
Build a ready-to-use GitHub Actions CI workflow. Pick triggers, language, version matrix and steps, then copy or download the .github/workflows YAML.
Gitignore Generator
Build a .gitignore from Node, Python, Java, Go, Rust, macOS, Windows and more. Pick your stacks, copy or download the file. Runs in your browser.
GitLab CI Generator
Build a .gitlab-ci.yml pipeline for Node projects. Pick stages, jobs, caching and variables, then copy or download the file. Runs in your browser.
Glassmorphism Generator
Create frosted glass CSS with a live preview. Set blur, transparency, tint, radius, border and shadow, then copy the backdrop-filter code.
Glob Tester
Test glob patterns against file paths with live results. Supports *, **, ?, character classes and brace alternation. Runs in your browser.
Gradient Text Generator
Generate CSS for gradient-filled text using background-clip. Pick two or more colors, set a linear angle or radial style, then copy the ready code.
GraphQL Formatter
Format and minify GraphQL queries, mutations and schemas online. Indent selections, normalize spacing and shrink queries. Runs in your browser.
HAR Analyzer
Analyze a HAR file in your browser. See request count, total size and load time, status and type breakdowns, plus the slowest and largest requests.
Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text. Live, lowercase hex output that runs entirely in your browser.
Htaccess Generator
Build an Apache .htaccess file with toggles for HTTPS, www, redirects, blocked IPs, error pages, caching and compression. Copy or download it.
HTML Entity Decoder
Decode HTML entities online. Turn named, decimal and hex entities like & and é back into plain text and symbols. Runs in your browser.
HTML Entity Encoder
Encode text to HTML entities online. Escape &, <, >, " and ' so markup renders safely, with an option to convert non-ASCII characters too. Free and private.
HTML Formatter
Beautify and indent messy HTML online. Pretty-print nested tags with custom indentation. Keeps pre, script and style intact. Runs in your browser.
HTML Minifier
Minify HTML online to shrink page size. Strips comments and collapses whitespace while keeping pre, script and style intact. Runs in your browser.
HTML Table Generator
Turn CSV, TSV or a pasted grid into clean, semantic HTML table markup. Header row, thead and tbody, escaped cells. Copy or download. Runs in your browser.
HTML to JSX
Convert HTML to JSX for React. Rename class and for, camelCase attributes and events, turn inline styles into objects and self-close void tags.
HTTP Header Builder
Build CORS, cache and security response headers, then copy them as raw HTTP, Nginx add_header or Apache Header set lines. Runs in your browser.
HTTP Header Reference
Searchable reference of common HTTP request and response headers. See direction, category, a clear description and a real example for each header.
HTTP Methods Reference
Searchable table of the nine RFC 9110 HTTP methods, showing which are safe, idempotent and cacheable, whether they carry a body, and what each is for.
HTTP Status Code Lookup
Look up any HTTP status code by number or name. See the reason phrase, the class (2xx, 4xx, 5xx) and a plain-English meaning. Free, fast and private.
HTTP Status Codes
Searchable list of HTTP status codes from 1xx to 5xx. Look up any code by number or name and see what 200, 301, 404 and 500 mean.
IEEE 754 Converter
Convert a number to its IEEE 754 half, single or double precision bits. See the sign, exponent and mantissa, hex, and the exact rounding error.
Indent Converter
Convert tabs to spaces or spaces to tabs online. Set your tab width, keep code aligned with real tab stops, then copy the result. Free and private.
IP Address Info
Parse an IPv4 or IPv6 address and see its class, integer, hex, binary, and whether it is private, loopback, link-local, reserved or public.
JSON Diff
Compare two JSON documents and see exactly what was added, removed or changed. Color-coded paths and values, key-order insensitive. Runs in your browser.
JSON Escape / Unescape
Escape a string so it is safe inside JSON, or decode JSON escape sequences back to plain text. Handles quotes, backslashes, newlines, tabs and unicode.
JSON Flatten
Flatten nested JSON to dot-notation keys like a.b.0, or unflatten dot keys back into nested objects and arrays. Free, private, runs in your browser.
JSON Formatter
Format, validate and minify JSON online. Pretty-print with custom indentation, sort keys and catch syntax errors. Runs in your browser.
JSON Path Finder
Find and extract values from JSON by path. Paste JSON, type a path like $.users[0].name, and get the value. Lists every leaf path. Runs in your browser.
JSON Schema Generator
Generate a JSON Schema from a JSON sample. Infers types, properties and required fields as draft-07, ready to copy or download. Runs in your browser.
JSON Schema Validator
Validate JSON against a draft-07 JSON Schema. See every error with its path, check types, required keys, formats and combinators. Runs in your browser.
JSON to Go
Generate Go structs from a JSON sample. Infers types, nested structs and slices, adds json tags, then copy or download the .go file. Runs in your browser.
JSON to Java
Generate Java classes or records from a JSON sample. Infers nested objects, lists and Jackson annotations, then copy or download the .java file. In browser.
JSON to Python Dataclass
Generate Python dataclasses from a JSON sample. Infers nested classes, lists and types, then copy or download the .py file. Runs in your browser.
JSON to Rust Serde
Generate Rust structs with serde Serialize and Deserialize derives from a JSON sample. Infers types, nested structs and Vec arrays. Runs in your browser.
JSON to SQL Schema
Generate a CREATE TABLE schema from JSON. Paste an object or array, pick Postgres, MySQL or SQLite, and get DDL with inferred column types.
JSON to TypeScript
Generate TypeScript interfaces from a JSON sample. Infers nested objects, arrays and union types, then copy or download the .ts file. Runs in your browser.
JSON to Zod
Generate a Zod schema from a JSON sample. Infers nested objects, arrays, unions, integers and email, url, uuid and datetime string formats. Private in browser.
JWT Decoder
Decode a JSON Web Token to read its header and payload claims. Shows exp, iat and nbf as dates. Runs in your browser. No signature check.
JWT Generator
Create a signed HS256 JSON Web Token from a JSON payload and secret. Signs in your browser, nothing is sent to a server. Great for testing.
Kubernetes Manifest Generator
Generate a Kubernetes Deployment, Service and optional Ingress from a short form. Set image, replicas, ports, env and resources. Runs in your browser.
Letter Spacing Calculator
Convert Photoshop or Figma tracking to CSS letter-spacing in em and px. Tracking is in thousandths of an em, so 50 becomes 0.05em. Exact and free.
License Generator
Generate a LICENSE file for your repo: MIT, Apache 2.0, BSD, GPL 3.0, ISC, MPL 2.0 or Unlicense. Fill in year and author, then copy or download.
Line Clamp Generator
Generate CSS to truncate text to a set number of lines with an ellipsis. Pick the line count and copy the ready -webkit-line-clamp code with a preview.
Line Height Calculator
Calculate a unitless CSS line-height from a font size and a pixel line height, or work out the pixel height from a ratio. Fast, exact, and private.
List Comparison
Compare two lists online to find items only in A, only in B, in both, or the combined union. Optional case-insensitive matching. Free and private.
LLM Token Counter
Count tokens for GPT-4o, Llama 3 and BERT with the real tokenizers, see the token split visualized, and estimate cost. Runs in your browser, nothing uploaded.
Lorem Picsum URL Builder
Build picsum.photos placeholder image URLs. Set width, height, grayscale, blur, a seed or image id, then copy the URL and preview it live.
MAC Address Generator
Generate a random MAC address online. Choose colon, hyphen or Cisco dot format, uppercase or lowercase, and a locally administered address. Copy instantly.
MAC Address Validator
Validate a MAC address in any format and analyze it. Normalize to colons, detect unicast or multicast, universal or local, and read the OUI vendor prefix.
Makefile Generator
Build a Makefile from variables and targets, with build, test and clean presets for Node, Python, Go, Rust and C. Recipes are tab indented. Copy or download.
Markdown Badge Generator
Create shields.io badges for your README. Set the label, message, color, style and logo, then copy the Markdown or HTML. Runs in your browser.
Markdown to HTML
Convert Markdown to clean HTML in your browser. Headings, bold, italic, links, images, lists, blockquotes and fenced code blocks, with text safely escaped.
MD5 Generator
Generate the MD5 hash of any text online. Get a lowercase 32-character hex digest instantly, computed in your browser with nothing uploaded.
Mesh Gradient Generator
Generate soft, multi-color mesh gradients as pure CSS. Pick a palette, set the blob count and copy a ready-to-paste background for your site.
MIME Type Finder
Find the MIME type for any file extension, or the extensions for a MIME type. Covers images, docs, audio, video, code, archives and fonts. Free and private.
MIME Type Lookup
Look up the MIME type for any file extension, or find every extension for a MIME type. Covers 120+ common types. Runs in your browser, no upload.
MongoDB Query Builder
Build MongoDB find queries from simple conditions. Pick a field, operator and value to get the filter JSON and a ready db.collection.find() string.
NanoID Generator
Generate NanoID strings online. Pick the size and alphabet, make one or thousands at once, then copy them. Secure, URL-safe and runs in your browser.
Neumorphism Generator
Generate soft UI neumorphism CSS. Pick a base color, set size, distance, intensity and blur, see a live preview, and copy the box-shadow code.
Nginx Config Generator
Build an Nginx server block for static sites, reverse proxies or PHP. Toggle SSL, gzip and body size, then copy or download nginx.conf.
OpenAPI Generator
Build a valid OpenAPI 3.0.3 spec from your endpoints. Add paths, parameters, request bodies and responses, then copy the YAML or JSON. Runs in your browser.
Password Generator
Generate strong, random passwords online. Choose length, letters, digits, symbols and skip look-alike characters. Created in your browser, never stored.
Password Strength Checker
Check how strong your password is. See its entropy in bits, an estimated crack time and tips to improve it. Runs in your browser, never stored.
Paste
Paste text or code and get a shareable link. The content is compressed into the link itself and never uploaded, so your paste stays private to whoever holds it.
Port Number Lookup
Look up well-known TCP and UDP port numbers and their services. Search by port number or service name to see the protocol and a short description.
Prettierrc Generator
Generate a .prettierrc file online. Set print width, semicolons, quotes, trailing commas and more, then copy minimal JSON. Free and private.
Properties to YAML
Convert Java .properties to YAML online and back. Dotted keys become nested YAML, numbers and booleans are typed. Runs in your browser.
Punycode Converter
Convert internationalized domains and emails to Punycode (xn--) and decode xn-- back to Unicode. RFC 3492, label aware, fast and private in your browser.
PX to EM Calculator
Convert px to em and em to px against a parent font-size. Em is relative to the parent element, not the root. Set the parent and copy the result.
PX to REM Calculator
Convert px to rem and rem to px against any root font-size. Set the root, type a value, and copy clean numbers for scalable CSS typography.
QR Code Generator
Create QR codes for a URL, WiFi, contact card, email, SMS, and more. Custom colors and error correction, download PNG or SVG. Nothing is uploaded.
Query String Parser
Parse a URL query string into key value pairs or JSON, and build one from pairs. Handles repeated keys, encoded characters and empty values.
Random MAC Address Generator
Generate random MAC addresses online. Pick the separator, uppercase, and locally administered or multicast bits, then copy one or many at once. Free.
Random Number Generator
Generate random numbers in any range online. Set a min, max and count, pick unique values, and copy the results. Secure and runs in your browser.
README Generator
Build a clean, well structured README.md for your project. Fill in the fields, get title, badges, features, install, usage and license. Runs in your browser.
Regex Cheatsheet
A searchable regex cheatsheet covering anchors, character classes, quantifiers, groups, lookarounds and flags, each with a meaning and a clear example.
Regex Explainer
Paste a regular expression to get a plain-English, token-by-token breakdown of what every part does, plus a summary and flag guide. Runs in your browser.
Regex Pattern Builder
Build ready-to-use regex for email, URL, IPv4, UUID, dates and more, or compose password rules with checkboxes. Copy the pattern. Runs in your browser.
Regex Tester
Test a regular expression against text with live match highlighting, capture groups and flags. See every match and replace text. Runs in your browser.
Scrollbar CSS Generator
Style custom scrollbars with a live preview. Set width, track, thumb and hover colors and radius, then copy WebKit and Firefox scrollbar CSS.
Semver Checker
Check whether a version satisfies a semver range like ^1.0.0, ~1.2.0 or >=1.0.0 <2.0.0. See the parsed version parts instantly. Runs in your browser.
SHA-256 Generator
Generate the SHA-256 hash of any text online. Get a lowercase 64-character hex digest instantly, computed in your browser with nothing uploaded.
Snowflake ID Decoder
Decode a Discord, Twitter or Instagram snowflake ID to its timestamp, worker, process and sequence. Pick a platform or set a custom epoch. Runs in your browser.
SQL Formatter
Format and beautify SQL online. Put clauses on their own lines, indent the column list and uppercase keywords. Fast and runs in your browser.
SQL IN Clause Builder
Paste a list of values and get a ready SQL IN (...) clause. Auto-quotes strings, leaves numbers bare, dedupes and sorts. Free, private, in your browser.
SQL Playground
Write and run SQL in your browser against an in-memory SQLite database. Query a sample dataset or load your own .sqlite file. Nothing is uploaded.
SQL Query Builder
Build SQL SELECT queries visually. Pick columns, add WHERE conditions, joins, ORDER BY and LIMIT, then copy clean SQL. Runs in your browser.
SQLite Viewer
Open a .sqlite or .db file in your browser and browse its tables, schema and rows. Run read-only SQL queries. Your data never leaves your device.
Srcset Generator
Generate a responsive image srcset and sizes attribute, plus copy-ready img and picture markup with width or DPR descriptors and modern formats.
String Escape
Escape or unescape a string for JSON, JavaScript, HTML, URL, shell or regex. Quotes, backslashes and special characters handled correctly. Free and private.
Subnet Calculator
Free IPv4 subnet calculator. Enter a CIDR like 192.168.1.0/24 to get the network, broadcast, subnet mask, host range and host count. Runs in your browser.
SVG Blob Generator
Generate organic SVG blob shapes with a live preview. Set points and randomness, pick a color or gradient, then copy or download the SVG.
SVG to JSX
Convert SVG markup to JSX for React. Camel-case attributes, fix class and style, self-close tags, and wrap it in a component. Free and in your browser.
SVG Wave Generator
Make smooth SVG wave dividers for your site. Drag sliders for amplitude, frequency and height, pick a color or gradient, then copy or download the SVG.
Systemd Service Generator
Build a systemd .service unit from a form. Set ExecStart, user, working dir, environment, restart policy and type, then copy or download the file.
Text Shadow Generator
Design a CSS text-shadow visually. Drag sliders for offset and blur, pick a color, stack layers, see a live preview, and copy the text-shadow code.
Text to HTML List
Turn lines of text into a clean HTML ul or ol list. Escapes special characters, skips blank lines and nests indented lines. Free, private, in your browser.
Token Generator
Generate secure random tokens online in hex, base64url or base64. Great for API keys, secrets and CSRF tokens. Runs in your browser, nothing stored.
tsconfig.json Generator
Generate a tsconfig.json for Node, Browser, React, Next.js or a library. Pick a preset, toggle strict, paths and source maps, then copy or download.
Twos Complement Calculator
Convert a signed integer to its twos complement binary and hex for any bit width. Also decodes a twos complement bit pattern back to a signed value.
Type Scale Calculator
Generate a modular type scale from a base size and a ratio. Get px and rem for every step, from small print to display headings. Free and exact.
Type Scale Generator
Generate a modular typographic scale from a base size and ratio. Get px and rem font sizes for every step, ready to drop into your CSS. Free and instant.
ULID Generator
Generate ULIDs online: time-sortable, 26-char Crockford base32 IDs. Make one or thousands, copy them, or decode a ULID to its timestamp. Free and private.
Unicode Character Lookup
Inspect every character in a string: Unicode code point, U+ hex, decimal, HTML entity and UTF-8 bytes. Emoji and astral characters handled. Free and private.
URL Decoder
Decode URL-encoded text online. Turn %20, %26 and + back into readable characters, with full unicode support. Free, instant and runs in your browser.
URL Encoder
URL encode text online with percent-encoding. Escape spaces and reserved characters for a query value, or encode a full URL. Free and private.
URL Encoder
Encode or decode URLs and query strings online. Percent-encode a value, escape a full URL, or decode back to plain text. Free, fast and private.
URL Parser
Parse a URL into protocol, host, port, path, query and hash. See every query parameter in a clean table. Free, private and runs in your browser.
User Agent Parser
Parse any User-Agent string into browser, OS and device. Paste a UA or use your own to see name, version and device type. Runs in your browser.
Username Generator
Generate cool username ideas instantly. Random, name-based and gamer styles with numbers, separators and length limits. Free, private, copy in one click.
UUID Decoder
Decode a UUID to reveal its version, variant, nil or max status, and the embedded timestamp, clock sequence and node for v1 and v7 UUIDs.
UUID Generator
Generate random version 4 UUIDs online. Create one or thousands at once, with uppercase or no-hyphen options, then copy them. Free and private.
UUID Validator
Validate a UUID and detect its version and variant. Paste a UUID or GUID, see if the format is valid, and read its version, variant and nil status.
Viewport Units Calculator
Convert vw and vh to px and back for any viewport size. See exactly how big 50vw or 10vh is on a given screen, then copy the value for your CSS.
XML Formatter
Format, beautify and minify XML online. Pretty-print with custom indentation, preserve attributes and the declaration. Runs in your browser.
YAML Formatter
Format and validate YAML online. Fix indentation, normalize messy YAML, sort keys and catch syntax errors. Runs entirely in your browser.