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List files/sizes inside an APK.

Show the IP address our server sees you connecting from.

Look up domain registration info.

Generate a scannable QR code.

Generate strong random passwords.

Monitor SSL certificate expiry dates.

Classic placeholder text for mockups.

Test a pattern against text with live match highlighting and capture groups.

Plain-text line diff with added/removed highlighting.

Live character, word, line, and sentence counts.

Spin up a public mock endpoint that returns configured responses.

Burst-test an endpoint to find its effective rate limit.

Compare two API responses and see a structured diff.

Build and send HTTP requests, inspect responses, save history.

Build or decode an HTTP Authorization: Basic header.

Convert curl commands to fetch/Python/PHP/HTTPie and back.

Run queries against any GraphQL endpoint and browse its schema.

Fetch a URL and explain its response headers, with a security-header grade.

Searchable reference of every standard HTTP response status code.

Decode and inspect JWT header/payload, verify signatures.

Searchable file extension <-> MIME type reference.

Walk through an OAuth2 Authorization Code flow and inspect tokens.

Validate a chat completions request or function/tool schema shape.

Convert an OpenAPI/Swagger spec to a Postman Collection and back.

Fill in {{variable}} prompt templates and preview the resolved prompt.

Design REST endpoint specs and generate docs/mocks from them.

Estimate LLM prompt token count.

Continuously monitor an endpoint for uptime/latency via cron.

Get a unique inbox URL and inspect incoming webhook requests live.

Check which web platform features your browser supports.

Press a key to see its KeyboardEvent key/code/keyCode values live.

Show your screen/viewport size live.

Preview a URL at common device viewport sizes.

Convert a .env file to JSON or YAML and back.

Build a Terraform variables file.

Parse or build an AWS ARN.

Toggle Unix file permissions to build a chmod command.

Look up AWS/GCP/Azure region codes.

Build and explain cron expressions.

Generate a docker-compose.yml.

Generate a Dockerfile for common stacks.

Convert between plain JSON and DynamoDB AttributeValue JSON.

Manage and diff .env files.

Build an AWS IAM policy JSON document.

Generate Kubernetes manifests.

Sample event payloads for S3/API Gateway/SNS/SQS/EventBridge.

Generate nginx server blocks.

Parse/build S3 URLs (virtual-hosted, path-style, s3://).

Re-indent Terraform configuration.

Monitor site/service uptime.

Parse a User-Agent string.

Carve a VPC CIDR into equal subnets.

Convert between CMYK (print) and RGB (screen) color values.

Convert between standard CSS named colors and hex codes.

Pick a color, see it in HEX/RGB/HSL.

WCAG text/background contrast ratio, AA/AAA pass-fail.

Convert between hex codes and RGB values.

Browse Google's Material Design color palette.

Generate random hex colors (pastel/vibrant/dark).

Convert between RGB and HSL.

Convert between RGB and HSV/HSB, the model used by Photoshop/Figma color pickers.

Browse Tailwind CSS's default color palette.

Convert CSV rows into INSERT statements.

Visualize table relationships.

Generate an ER diagram from a schema.

Pretty-print a MongoDB query/document.

Build MongoDB queries visually.

Visualize an EXPLAIN plan.

Beautify messy SQL into a readable style.

Diff two schema/query snapshots.

Format and beautify SQL queries.

Analyze a query for potential performance issues.

Parse INSERT statements into a JSON array.

Convert text to/from decimal character codes.

Convert text to/from Base32 (RFC 4648).

Convert text to/from Base58 (Bitcoin alphabet).

Convert Base64 to a hex byte string and back.

Convert text to/from 8-bit binary bytes.

Convert any file to a Base64 data URI, entirely in your browser.

Convert text to/from hex bytes.

Convert a URL query string to a JSON object and back.

Convert text to/from Unicode code points (U+XXXX).

Percent-encode or decode text, component or full-URI mode.

Generate Luhn-valid dummy card numbers for sandbox testing.

Generate fake street addresses for testing.

Generate fake phone numbers (US 555 exchange, etc).

Generate fake names/emails/usernames for testing.

Generate test email addresses on RFC 2606 reserved domains.

Generate harmonious color palettes.

Design CSS @keyframes animations.

Re-indent or minify CSS.

Design and export CSS gradients.

Convert a CSS length across px, rem, em, pt, and %.

Generate all standard favicon sizes.

Convert a font file between TTF/OTF and WOFF.

Generate glassmorphism CSS.

Diff two HTML snapshots.

Encode or decode HTML entities.

Format and minify HTML markup.

Visually build an HTML table.

Convert between Markdown and HTML.

Generate head meta/Open Graph/Twitter Card tags.

Generate neumorphism CSS.

Design layered CSS box-shadows.

Minify and clean up SVG markup.

Visually build Tailwind class combos.

Build a .gitignore from checklists by language, editor, and OS.

Find stale/merged branches to clean up.

Generate a changelog from commit history.

Searchable reference of common git commands.

Generate a conventional-commit message.

Visualize and help resolve merge conflicts.

Generate release notes from merged PRs.

Convert an image to a base64 data URI and back.

Shrink an image via adjustable JPEG/WebP quality.

Drag-select and crop an image.

Resize an image to exact dimensions.

Convert an image between formats.

Generate a lightweight inline-SVG placeholder image, no network request.

Rasterize SVG markup to PNG or JPEG at any size.

Preview SVG markup safely (rendered as an image, not injected).

Convert between CSV and JSON.

Convert CSV to a real .xlsx file and back.

Re-indent Firestore security rules.

Convert a Java .properties file to JSON or YAML and back.

Diff two JSON documents.

Validate, pretty-print, and minify JSON.

Test JSONPath expressions against sample JSON.

Build a JSON Schema visually from sample data.

Convert JSON to XML, mirroring our XML to JSON Converter's conventions.

Convert between TOML and JSON/YAML.

Validate and preview TOML as JSON.

Pretty-print and validate XML.

Convert XML documents to JSON.

Convert a common YAML subset to JSON and back.

Validate and format YAML documents.

Parse and summarize crash reports.

Annotate screenshots to report bugs.

Summarize error rates/patterns in logs.

Search and tail uploaded log files.

Pretty-print raw stack traces.

List files/sizes inside an APK.

Generate all required app icon sizes.

Generate a mobile app privacy policy.

Generate app store release notes.

Analyze keyword competitiveness.

Generate App Store/Play Store metadata.

Find high-value ASO keywords.

Build a .entitlements file (associated domains, app groups, push, iCloud, etc).

Validate a google-services.json against the expected Firebase config shape.

Build an iOS/macOS Info.plist from common bundle/privacy keys.

Manage translation strings across locales.

Build sample APNs and FCM push payloads.

Binary arithmetic plus a base converter.

AND/OR/XOR/NOT/shift with a bit-level view.

A browser stopwatch with lap times.

Subnet math — network/broadcast address, netmask, host range.

Convert between seconds, HH:MM:SS, and human-readable durations.

Add a duration to a start time and see the resulting date/time.

Hex arithmetic/bitwise ops plus a base converter.

Convert IPv4 to its integer/hex form and IPv4-mapped IPv6.

Generate random, locally-administered MAC addresses.

Show the IP address our server sees you connecting from.

Convert bps/Mbps/etc. and estimate download time.

Four common percentage calculations in one place.

Generate random TCP/UDP port numbers for dev servers and configs.

Convert data sizes between bytes/KB/MB/GB/TB, decimal or binary.

Convert between Celsius, Fahrenheit, and Kelvin.

Look up domain registration info.

Generate an EAN-13 barcode.

Generate a scannable QR code.

Encode or decode Base64 text and files.

Test CORS behavior of an endpoint.

Encrypt/decrypt text with common ciphers.

Generate MD5/SHA family hashes.

Compute an HMAC from a message and secret key (SHA-1/256/384/512).

Validate an IBAN's mod-97 checksum and break it into country/BBAN.

Generate strong random passwords.

Score a password's strength and estimate crack time, entirely client-side.

Generate passwords, API keys, AES keys, UUIDs, and RSA/SSH key pairs — all client-side.

Monitor SSL certificate expiry dates.

Mask the middle of a string for redacting keys/emails in screenshots.

Generate secure random tokens/API keys.

Generate sortable, Crockford Base32-encoded ULIDs in bulk.

Generate v4/v7 UUIDs in bulk.

Build a canonical link tag.

Build hreflang alternate-language link tags.

Build a robots.txt from rule groups.

Build JSON-LD structured data for common types.

Build a sitemap.xml from a pasted URL list.

Convert between UPPER/lower/Title/camelCase/snake_case/etc.

Remove repeated lines, keep the first occurrence.

Normalize an email to its provider-canonical form for deduping.

Find/replace text with regex and whole-word options.

Reshape a list — trim, dedupe, sort, wrap, and rejoin with any separator.

Classic placeholder text for mockups.

Abbreviate words like "i18n" — first letter, middle count, last letter.

Random common-English filler text.

Searchable reference of regex tokens, quantifiers, and common patterns.

Test a pattern against text with live match highlighting and capture groups.

Strip empty/whitespace-only lines.

Convert between Arabic numbers and Roman numerals.

Randomize the order of lines.

Convert text into a URL-safe slug.

Sort lines alphabetically, A-Z or Z-A.

Plain-text line diff with added/removed highlighting.

Spell out text using the NATO phonetic alphabet.

Live character, word, line, and sentence counts.

Build an Apple App Store link from an app ID.

Build a custom URI scheme deep link.

Build a mailto: link with subject/body/cc/bcc.

Build a Google Play Store link from a package name.

Recover the original URL from a Microsoft Safe Links wrapped link.

Build a cross-platform sms: link with a pre-filled message.

Convert between Unix timestamps and dates.

Follow redirects to the final destination.

Break a URL down into protocol, host, path, query params, and hash.

Create short redirect links.

Build a wa.me click-to-chat link.