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.
Turn screenshots into polished images with device frames, gradients, shadows and text.
Follow a web address through every redirect and see status codes, loops and HTTPS upgrades.
Find high-value ASO keywords.
Build a mailto: link with subject/body/cc/bcc.
Generate a Dockerfile for common stacks.
Generate neumorphism CSS.
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.
Minify and clean up SVG markup.
Convert between Markdown and HTML.
Design CSS @keyframes animations.
Visually build an HTML table.
Generate all standard favicon sizes.
Design and export CSS gradients.
Generate head meta/Open Graph/Twitter Card tags.
Design layered CSS box-shadows.
Encode or decode HTML entities.
Convert a font file between TTF/OTF and WOFF.
Generate harmonious color palettes.
Diff two HTML snapshots.
Visually build Tailwind class combos.
Preview a URL at common device viewport sizes.
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.
Add a duration to a start time and see the resulting date/time.
Expand a CIDR block or address range into every individual IP address.
Convert data sizes between bytes/KB/MB/GB/TB, decimal or binary.
Binary arithmetic plus a base converter.
AND/OR/XOR/NOT/shift with a bit-level view.
Four common percentage calculations in one place.
Subnet math — network/broadcast address, netmask, host range.
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.
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 an RFC 4193 Unique Local Address prefix for private IPv6 numbering.
Generate random, locally-administered MAC addresses.
Convert CIDR, subnet and wildcard masks and generate Cisco ACL lines.
Find the holder, origin AS, announced prefix and BGP neighbours for an IP, prefix, AS number or hostname.
Convert between Celsius, Fahrenheit, and Kelvin.
Searchable list of common TCP and UDP ports and the services that use them.
Hex arithmetic/bitwise ops plus a base converter.
Convert bps/Mbps/etc. and estimate download time.
Summarize IPv4 and IPv6 routes into the smallest list of prefixes or one summary route.
Convert a time between zones with daylight saving handled, and find a meeting hour for everyone.
Generate random TCP/UDP port numbers for dev servers and configs.
Calculate the TCP window you need and the real throughput given bandwidth, latency and packet loss.
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 Unicode code points (U+XXXX).
Convert text to/from Base58 (Bitcoin alphabet).
Automatically detect and decode Base64, hex, URL encoding, gzip and more, layer by layer.
Convert text to/from hex bytes.
Convert text to/from Base32 (RFC 4648).
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.
Build a sitemap.xml from a pasted URL list.
Build hreflang alternate-language link tags.
Build a robots.txt from rule groups.
Build JSON-LD structured data for common types.
Build a canonical link tag.
Build an AWS IAM policy JSON document.
Build a Terraform variables file.
Toggle Unix file permissions to build a chmod command.
Carve a VPC CIDR into equal subnets.
Look up AWS/GCP/Azure region codes.
Convert a docker run command into an equivalent docker-compose.yml service block.
Parse or build an AWS ARN.
Manage and diff .env files.
Re-indent Terraform configuration.
Monitor site/service uptime.
Sample event payloads for S3/API Gateway/SNS/SQS/EventBridge.
Parse/build S3 URLs (virtual-hosted, path-style, s3://).
Generate a GitHub Actions workflow for Node, Python, PHP, Go, Java, Rust, .NET, Docker or Pages.
Convert between plain JSON and DynamoDB AttributeValue JSON.
Generate nginx server blocks.
Convert a .env file to JSON or YAML and back.
Test which versions satisfy an npm-style semantic version range.
Build an Apache .htaccess file for redirects, HTTPS, caching, compression and security, with Nginx rules.
Build and explain cron expressions.
Parse a User-Agent string.
Generate a docker-compose.yml.
Generate Kubernetes manifests.
Build sample APNs and FCM push payloads.
Validate a google-services.json against the expected Firebase config shape.
Build a .entitlements file (associated domains, app groups, push, iCloud, etc).
Generate all required app icon sizes.
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.
Generate app store release notes.
Test a pattern against text with live match highlighting and capture groups.
Evaluate a math expression with a real parser (no eval) — operators, functions, constants.
Reshape a list — trim, dedupe, sort, wrap, and rejoin with any separator.
Plain-text line diff with added/removed highlighting.
Find/replace text with regex and whole-word options.
Searchable reference of regex tokens, quantifiers, and common patterns.
Strip empty/whitespace-only lines.
Randomize the order of lines.
Remove repeated lines, keep the first occurrence.
Live character, word, line, and sentence counts.
Render text as ASCII art by sampling a real rendered font, not a fixed glyph set.
Abbreviate words like "i18n" — first letter, middle count, last letter.
Convert text into a URL-safe slug.
Normalize an email to its provider-canonical form for deduping.
Convert between UPPER/lower/Title/camelCase/snake_case/etc.
Convert between Arabic numbers and Roman numerals.
Search and copy from a curated set of common emoji, grouped by category.
Random common-English filler text.
Sort lines alphabetically, A-Z or Z-A.
Spell out text using the NATO phonetic alphabet.
Parse a phone number into its E.164 calling code, country, and national number.
Encode or decode Base64 text and files.
Generate sortable, Crockford Base32-encoded ULIDs in bulk.
Hash or verify text with bcrypt, using PHP's native password_hash/password_verify.
Generate a live TOTP (RFC 6238) code from a Base32 secret or otpauth:// URI.
Test CORS behavior of an endpoint.
Generate secure random tokens/API keys.
Show the SHA256 and MD5 fingerprint, type and size of an SSH public key and compare it with another.
Generate MD5/SHA family hashes.
Validate an IBAN's mod-97 checksum and break it into country/BBAN.
Look up a CVE ID or search by product: severity, CISA KEV status, exploit probability, affected products and references.
Compute an HMAC from a message and secret key (SHA-1/256/384/512).
Score vulnerabilities with CVSS 3.1: base, temporal and environmental scores and the vector string.
Encrypt/decrypt text with common ciphers.
Read the version and creation time inside a UUID, and generate sortable UUID v7 values.
Create the integrity attribute and HTML tag for scripts and stylesheets loaded from a CDN.
Mask the middle of a string for redacting keys/emails in screenshots.
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.
Score a password's strength and estimate crack time, entirely client-side.
Create an RFC 9116 security.txt file so researchers know how to report vulnerabilities.
Generate a BIP39 mnemonic seed phrase (12-24 words) with correct entropy and checksum.
Check whether a password appears in known data breaches without sending it.
Decode an X.509 certificate or CSR: subject, issuer, validity, SANs, key and fingerprints.
Find out which algorithm a hash came from, or checksum a file with MD5, SHA-1 and SHA-2.
Monitor SSL certificate expiry dates.
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.
Searchable file extension <-> MIME type reference.
Build and send HTTP requests, inspect responses, save history.
Burst-test an endpoint to find its effective rate limit.
Fill in {{variable}} prompt templates and preview the resolved prompt.
Searchable reference of every standard HTTP response status code.
Validate a chat completions request or function/tool schema shape.
Convert curl commands to fetch/Python/PHP/HTTPie and back.
Build or decode an HTTP Authorization: Basic header.
Fetch a URL and explain its response headers, with a security-header grade.
Decode and inspect JWT header/payload, verify signatures.
Walk through an OAuth2 Authorization Code flow and inspect tokens.
Design REST endpoint specs and generate docs/mocks from them.
Estimate LLM prompt token count.
Run queries against any GraphQL endpoint and browse its schema.
Compare two API responses and see a structured diff.
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.
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.
Build shields.io badges for version, build, licence and downloads and copy them as Markdown or HTML.
Generate a changelog from commit history.
Generate release notes from merged PRs.
Validate and format YAML documents.
Diff two JSON documents.
Pretty-print and validate XML.
Validate, pretty-print, and minify JSON.
Convert between TOML and JSON/YAML.
Convert JSON to XML, mirroring our XML to JSON Converter's conventions.
Convert JSON to CSV with flattening, delimiters and Excel-friendly output.
Convert XML documents to JSON.
Build a JSON Schema visually from sample data.
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.
Validate and preview TOML as JSON.
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.
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.
Build a cross-platform sms: link with a pre-filled message.
Break a URL down into protocol, host, path, query params, and hash.
Build a Google Play Store link from a package name.
Build an Apple App Store link from an app ID.
Follow redirects to the final destination.
Build a wa.me click-to-chat link.
Create short redirect links.
Resize an image to exact dimensions.
Drag-select and crop an image.
Shrink an image via adjustable JPEG/WebP quality.
Preview SVG markup safely (rendered as an image, not injected).
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.
Rasterize SVG markup to PNG or JPEG at any size.
Convert an image between formats.
Generate a lightweight inline-SVG placeholder image, no network request.
Format and beautify SQL queries.
Build MongoDB queries visually.
Parse INSERT statements into a JSON array.
Analyze a query for potential performance issues.
Convert CSV rows into INSERT statements.
Diff two schema/query snapshots.
Visualize table relationships.
Generate an ER diagram from a schema.
Visualize an EXPLAIN plan.
Pretty-print a MongoDB query/document.
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.