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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.

Show your screen/viewport size live.

Preview a URL at common device viewport sizes.

Check which web platform features your browser supports.

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.

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.

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 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).

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.

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.

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.

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.

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.

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.

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.

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.

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.

Generate a scannable QR code.

Generate an EAN-13 barcode.

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.

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.

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.