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