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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.

Live character, word, line, and sentence counts.

Classic placeholder text for mockups.

Plain-text line diff with added/removed highlighting.

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

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

Generate strong random passwords.

Generate MD5/SHA family hashes.

Generate v4/v7 UUIDs in bulk.

Generate secure random tokens/API keys.

Encode or decode Base64 text and files.

Encrypt/decrypt text with common ciphers.

Monitor SSL certificate expiry dates.

Test CORS behavior of an endpoint.

Generate App Store/Play Store metadata.

Generate all required app icon sizes.

Generate a mobile app privacy policy.

Analyze keyword competitiveness.

Find high-value ASO keywords.

Generate app store release notes.

Manage translation strings across locales.

List files/sizes inside an APK.

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

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

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

Build sample APNs and FCM push payloads.

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

Decode and inspect JWT header/payload, verify signatures.

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

Run queries against any GraphQL endpoint and browse its schema.

Compare two API responses and see a structured diff.

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

Continuously monitor an endpoint for uptime/latency via cron.

Spin up a public mock endpoint that returns configured responses.

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

Walk through an OAuth2 Authorization Code flow and inspect tokens.

Estimate LLM prompt token count.

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

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

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

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

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

Convert between hex codes and RGB values.

Convert between RGB and HSL.

Browse Tailwind CSS's default color palette.

Browse Google's Material Design color palette.

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

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

Design and export CSS gradients.

Generate glassmorphism CSS.

Generate neumorphism CSS.

Visually build Tailwind class combos.

Minify and clean up SVG markup.

Generate harmonious color palettes.

Design layered CSS box-shadows.

Design CSS @keyframes animations.

Format and minify HTML markup.

Generate head meta/Open Graph/Twitter Card tags.

Generate all standard favicon sizes.

Convert between Markdown and HTML.

Visually build an HTML table.

Encode or decode HTML entities.

Diff two HTML snapshots.

Re-indent or minify CSS.

Validate, pretty-print, and minify JSON.

Diff two JSON documents.

Build a JSON Schema visually from sample data.

Test JSONPath expressions against sample JSON.

Validate and format YAML documents.

Pretty-print and validate XML.

Convert XML documents to JSON.

Convert between CSV and JSON.

Re-indent Firestore security rules.

Validate and preview TOML as JSON.

Show your screen/viewport size live.

Preview a URL at common device viewport sizes.

Check which web platform features your browser supports.

Search and tail uploaded log files.

Summarize error rates/patterns in logs.

Pretty-print raw stack traces.

Parse and summarize crash reports.

Annotate screenshots to report bugs.

Format and beautify SQL queries.

Beautify messy SQL into a readable style.

Analyze a query for potential performance issues.

Diff two schema/query snapshots.

Generate an ER diagram from a schema.

Visualize table relationships.

Build MongoDB queries visually.

Visualize an EXPLAIN plan.

Parse INSERT statements into a JSON array.

Convert CSV rows into INSERT statements.

Pretty-print a MongoDB query/document.

Shrink an image via adjustable JPEG/WebP quality.

Resize an image to exact dimensions.

Drag-select and crop an image.

Convert an image between formats.

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

Convert an image to a base64 data URI and back.

Build a custom URI scheme deep link.

Build an Apple App Store link from an app ID.

Build a Google Play Store link from a package name.

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

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

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

Convert between Unix timestamps and dates.

Create short redirect links.

Follow redirects to the final destination.

Searchable reference of common git commands.

Generate a conventional-commit message.

Find stale/merged branches to clean up.

Visualize and help resolve merge conflicts.

Generate a changelog from commit history.

Generate release notes from merged PRs.

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

Build a robots.txt from rule groups.

Build a sitemap.xml from a pasted URL list.

Build JSON-LD structured data for common types.

Build hreflang alternate-language link tags.

Build a canonical link tag.

Show the IP address our server sees you connecting from.

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

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

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

Binary arithmetic plus a base converter.

Hex arithmetic/bitwise ops plus a base converter.

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

Look up domain registration info.

Build and explain cron expressions.

Generate a docker-compose.yml.

Generate a Dockerfile for common stacks.

Generate Kubernetes manifests.

Manage and diff .env files.

Generate nginx server blocks.

Monitor site/service uptime.

Parse or build an AWS ARN.

Build an AWS IAM policy JSON document.

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

Parse a User-Agent string.

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

Look up AWS/GCP/Azure region codes.

Re-indent Terraform configuration.

Build a Terraform variables file.

Carve a VPC CIDR into equal subnets.

Convert between plain JSON and DynamoDB AttributeValue JSON.

Generate fake names/emails/usernames for testing.

Generate fake street addresses for testing.

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

Generate Luhn-valid dummy card numbers for sandbox testing.

Generate test email addresses on RFC 2606 reserved domains.

Generate a scannable QR code.

Generate an EAN-13 barcode.

Remove repeated lines, keep the first occurrence.

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

Randomize the order of lines.

Strip empty/whitespace-only lines.

Live character, word, line, and sentence counts.

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

Convert text into a URL-safe slug.

Classic placeholder text for mockups.

Random common-English filler text.

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

Plain-text line diff with added/removed highlighting.

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

Convert text to/from decimal character codes.

Convert text to/from hex bytes.

Convert text to/from 8-bit binary bytes.

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