Format minified JavaScript or compact it, with strings, templates and regex handled safely.
Check if a website is online and see its hosting, WordPress detection, SSL, DNS, SEO and performance.
Compare the execution speed of 2+ JS snippets, run in an isolated Web Worker.
Read any website's sitemap, see its page structure as a tree and graph, and check titles, meta tags and status codes.
Follow a web address through every redirect and see status codes, loops and HTTPS upgrades.
Build an iOS/macOS Info.plist from common bundle/privacy keys.
Reshape a list — trim, dedupe, sort, wrap, and rejoin with any separator.
Press a key to see its KeyboardEvent key/code/keyCode values live.
Generate harmonious color palettes.
Validate and preview TOML as JSON.
Convert an image between formats.
Test every key of a new or old keyboard: on-screen layout, double-press detection, rollover test, heatmap and typing speed.
A browser stopwatch with lap times.
Show the IP address our server sees you connecting from.
Look up domain registration info.
Generate a scannable QR code.
Generate strong random passwords.
Generate passwords, API keys, AES keys, UUIDs, and RSA/SSH key pairs — all client-side.
Generate v4/v7 UUIDs in bulk.
Classic placeholder text for mockups.
Re-indent or minify CSS.
Convert a CSS length across px, rem, em, pt, and %.
Generate glassmorphism CSS.
Format and minify HTML markup.
Design CSS @keyframes animations.
Minify and clean up SVG markup.
Convert between Markdown and HTML.
Generate all standard favicon sizes.
Design and export CSS gradients.
Visually build an HTML table.
Generate head meta/Open Graph/Twitter Card tags.
Design layered CSS box-shadows.
Convert a font file between TTF/OTF and WOFF.
Diff two HTML snapshots.
Encode or decode HTML entities.
Generate neumorphism CSS.
Visually build Tailwind class combos.
Preview a URL at common device viewport sizes.
Show your screen/viewport size live.
Check which web platform features your browser supports.
Add a duration to a start time and see the resulting date/time.
Find the holder, origin AS, announced prefix and BGP neighbours for an IP, prefix, AS number or hostname.
Convert MAC address formats, get the IPv6 link-local address and the Wake-on-LAN magic packet.
Binary arithmetic plus a base converter.
Convert CIDR, subnet and wildcard masks and generate Cisco ACL lines.
Convert data sizes between bytes/KB/MB/GB/TB, decimal or binary.
Searchable list of common TCP and UDP ports and the services that use them.
AND/OR/XOR/NOT/shift with a bit-level view.
Expand a CIDR block or address range into every individual IP address.
Summarize IPv4 and IPv6 routes into the smallest list of prefixes or one summary route.
Subnet math — network/broadcast address, netmask, host range.
Calculate the TCP window you need and the real throughput given bandwidth, latency and packet loss.
Convert between seconds, HH:MM:SS, and human-readable durations.
Convert a time between zones with daylight saving handled, and find a meeting hour for everyone.
Convert IPv4 to its integer/hex form and IPv4-mapped IPv6.
Four common percentage calculations in one place.
Generate random, locally-administered MAC addresses.
Generate random TCP/UDP port numbers for dev servers and configs.
Convert bps/Mbps/etc. and estimate download time.
Decode a MAC address's bit flags plus a best-effort vendor lookup.
Generate an RFC 4193 Unique Local Address prefix for private IPv6 numbering.
Convert between Celsius, Fahrenheit, and Kelvin.
Hex arithmetic/bitwise ops plus a base converter.
Build hreflang alternate-language link tags.
Build a robots.txt from rule groups.
Build a sitemap.xml from a pasted URL list.
Build a canonical link tag.
Build JSON-LD structured data for common types.
Automatically detect and decode Base64, hex, URL encoding, gzip and more, layer by layer.
Convert text to/from 8-bit binary bytes.
Convert text to/from decimal character codes.
Percent-encode or decode text, component or full-URI mode.
Convert text to/from Base58 (Bitcoin alphabet).
Convert text to/from Base32 (RFC 4648).
Convert text to/from Unicode code points (U+XXXX).
Convert text to/from hex bytes.
Convert any file to a Base64 data URI, entirely in your browser.
Convert Base64 to a hex byte string and back.
Convert a URL query string to a JSON object and back.
Encode or decode Base64 text and files.
Show the SHA256 and MD5 fingerprint, type and size of an SSH public key and compare it with another.
Look up a CVE ID or search by product: severity, CISA KEV status, exploit probability, affected products and references.
Score vulnerabilities with CVSS 3.1: base, temporal and environmental scores and the vector string.
Generate sortable, Crockford Base32-encoded ULIDs in bulk.
Create the integrity attribute and HTML tag for scripts and stylesheets loaded from a CDN.
Hash or verify text with bcrypt, using PHP's native password_hash/password_verify.
Check whether a password appears in known data breaches without sending it.
Read the version and creation time inside a UUID, and generate sortable UUID v7 values.
Build a Content-Security-Policy and find weaknesses in an existing one.
Pull IPs, domains, URLs, emails, hashes and CVEs out of text, and defang or refang links.
Generate a live TOTP (RFC 6238) code from a Base32 secret or otpauth:// URI.
Test CORS behavior of an endpoint.
Create an RFC 9116 security.txt file so researchers know how to report vulnerabilities.
Validate an IBAN's mod-97 checksum and break it into country/BBAN.
Compute an HMAC from a message and secret key (SHA-1/256/384/512).
Find out which algorithm a hash came from, or checksum a file with MD5, SHA-1 and SHA-2.
Decode an X.509 certificate or CSR: subject, issuer, validity, SANs, key and fingerprints.
Generate MD5/SHA family hashes.
Encrypt/decrypt text with common ciphers.
Generate secure random tokens/API keys.
Generate a BIP39 mnemonic seed phrase (12-24 words) with correct entropy and checksum.
Mask the middle of a string for redacting keys/emails in screenshots.
Score a password's strength and estimate crack time, entirely client-side.
Monitor SSL certificate expiry dates.
Build an AWS IAM policy JSON document.
Manage and diff .env files.
Monitor site/service uptime.
Look up AWS/GCP/Azure region codes.
Generate a GitHub Actions workflow for Node, Python, PHP, Go, Java, Rust, .NET, Docker or Pages.
Build an Apache .htaccess file for redirects, HTTPS, caching, compression and security, with Nginx rules.
Toggle Unix file permissions to build a chmod command.
Parse or build an AWS ARN.
Generate nginx server blocks.
Convert a docker run command into an equivalent docker-compose.yml service block.
Carve a VPC CIDR into equal subnets.
Build a Terraform variables file.
Sample event payloads for S3/API Gateway/SNS/SQS/EventBridge.
Test which versions satisfy an npm-style semantic version range.
Re-indent Terraform configuration.
Convert a .env file to JSON or YAML and back.
Parse/build S3 URLs (virtual-hosted, path-style, s3://).
Generate a Dockerfile for common stacks.
Convert between plain JSON and DynamoDB AttributeValue JSON.
Build and explain cron expressions.
Parse a User-Agent string.
Generate a docker-compose.yml.
Generate Kubernetes manifests.
Generate all required app icon sizes.
Validate a google-services.json against the expected Firebase config shape.
Build sample APNs and FCM push payloads.
Build a .entitlements file (associated domains, app groups, push, iCloud, etc).
Generate a mobile app privacy policy.
Manage translation strings across locales.
Analyze keyword competitiveness.
List files/sizes inside an APK.
Generate App Store/Play Store metadata.
Find high-value ASO keywords.
Generate app store release notes.
WCAG text/background contrast ratio, AA/AAA pass-fail.
Convert between RGB and HSV/HSB, the model used by Photoshop/Figma color pickers.
Convert between hex codes and RGB values.
Convert between RGB and HSL.
Convert between CMYK (print) and RGB (screen) color values.
Pick a color, see it in HEX/RGB/HSL.
Generate random hex colors (pastel/vibrant/dark).
Browse Tailwind CSS's default color palette.
Convert between standard CSS named colors and hex codes.
Browse Google's Material Design color palette.
Plain-text line diff with added/removed highlighting.
Test a pattern against text with live match highlighting and capture groups.
Live character, word, line, and sentence counts.
Render text as ASCII art by sampling a real rendered font, not a fixed glyph set.
Evaluate a math expression with a real parser (no eval) — operators, functions, constants.
Find/replace text with regex and whole-word options.
Normalize an email to its provider-canonical form for deduping.
Searchable reference of regex tokens, quantifiers, and common patterns.
Remove repeated lines, keep the first occurrence.
Strip empty/whitespace-only lines.
Convert text into a URL-safe slug.
Randomize the order of lines.
Abbreviate words like "i18n" — first letter, middle count, last letter.
Spell out text using the NATO phonetic alphabet.
Convert between Arabic numbers and Roman numerals.
Random common-English filler text.
Sort lines alphabetically, A-Z or Z-A.
Convert between UPPER/lower/Title/camelCase/snake_case/etc.
Search and copy from a curated set of common emoji, grouped by category.
Parse a phone number into its E.164 calling code, country, and national number.
Build a .gitignore from checklists by language, editor, and OS.
Searchable reference of common git commands.
Find stale/merged branches to clean up.
Generate a changelog from commit history.
Build shields.io badges for version, build, licence and downloads and copy them as Markdown or HTML.
Visualize and help resolve merge conflicts.
Generate a conventional-commit message.
Generate release notes from merged PRs.
Build and send HTTP requests, inspect responses, save history.
Searchable reference of every standard HTTP response status code.
Fill in {{variable}} prompt templates and preview the resolved prompt.
Burst-test an endpoint to find its effective rate limit.
Convert curl commands to fetch/Python/PHP/HTTPie and back.
Searchable file extension <-> MIME type reference.
Build or decode an HTTP Authorization: Basic header.
Validate a chat completions request or function/tool schema shape.
Walk through an OAuth2 Authorization Code flow and inspect tokens.
Fetch a URL and explain its response headers, with a security-header grade.
Estimate LLM prompt token count.
Decode and inspect JWT header/payload, verify signatures.
Design REST endpoint specs and generate docs/mocks from them.
Compare two API responses and see a structured diff.
Run queries against any GraphQL endpoint and browse its schema.
Convert an OpenAPI/Swagger spec to a Postman Collection and back.
Get a unique inbox URL and inspect incoming webhook requests live.
Continuously monitor an endpoint for uptime/latency via cron.
Generate test email addresses on RFC 2606 reserved domains.
Generate fake phone numbers (US 555 exchange, etc).
Generate Luhn-valid dummy card numbers for sandbox testing.
Generate fake names/emails/usernames for testing.
Generate fake street addresses for testing.
Recover the original URL from a Microsoft Safe Links wrapped link.
Convert between Unix timestamps and dates.
Build a custom URI scheme deep link.
Follow redirects to the final destination.
Break a URL down into protocol, host, path, query params, and hash.
Build a Google Play Store link from a package name.
Build a cross-platform sms: link with a pre-filled message.
Build a mailto: link with subject/body/cc/bcc.
Build an Apple App Store link from an app ID.
Build a wa.me click-to-chat link.
Create short redirect links.
Validate and format YAML documents.
Convert JSON to CSV with flattening, delimiters and Excel-friendly output.
Pretty-print and validate XML.
Build a JSON Schema visually from sample data.
Convert XML documents to JSON.
Validate, pretty-print, and minify JSON.
Diff two JSON documents.
Generate realistic sample JSON that follows a JSON Schema, with a repeatable seed.
Generate TypeScript, Go, Java, C# or Python types from sample JSON.
Re-indent Firestore security rules.
Convert JSON to XML, mirroring our XML to JSON Converter's conventions.
Convert between TOML and JSON/YAML.
Test JSONPath expressions against sample JSON.
Convert between CSV and JSON.
Convert a Java .properties file to JSON or YAML and back.
Convert a common YAML subset to JSON and back.
Convert CSV to a real .xlsx file and back.
Turn a code snippet into a styled PNG with themes, window frames and line numbers.
Drag-select and crop an image.
Shrink an image via adjustable JPEG/WebP quality.
Resize an image to exact dimensions.
Convert an image to a base64 data URI and back.
Preview SVG markup safely (rendered as an image, not injected).
Rasterize SVG markup to PNG or JPEG at any size.
Generate a lightweight inline-SVG placeholder image, no network request.
Turn screenshots into polished images with device frames, gradients, shadows and text.
Format and beautify SQL queries.
Build MongoDB queries visually.
Convert CSV rows into INSERT statements.
Analyze a query for potential performance issues.
Parse INSERT statements into a JSON array.
Visualize table relationships.
Diff two schema/query snapshots.
Generate an ER diagram from a schema.
Pretty-print a MongoDB query/document.
Visualize an EXPLAIN plan.
Pretty-print raw stack traces.
Annotate screenshots to report bugs.
Parse and summarize crash reports.
Summarize error rates/patterns in logs.
Search and tail uploaded log files.
Generate an EAN-13 barcode.