Lookup & System Tools
12 free browser, system, and reference utilities: color conversion, unit conversion, user agent parsing, HTTP codes, and more. Everything runs in your browser with no data sent to any server.
Browser Info
Inspect your browser, OS, screen, network, and feature support in real time. Hardware concurrency, touch points, WebGL, WASM, and 18 more APIs checked.
User Agent Parser
Parse any user agent string into browser, engine, OS, device type, and bot detection. Test with 6 sample UAs or paste your own.
Color Converter
Convert colors between HEX, RGB, HSL, HSV, and CMYK instantly. Visual swatch, color picker, named color lookup, and WCAG contrast ratio.
Unit Converter
Convert between units across 7 categories: length, weight, temperature, area, volume, speed, and digital storage. All conversions shown simultaneously.
Timezone Converter
Convert a date and time across multiple timezones simultaneously. World clock, DST awareness, and offset display for 40+ timezones.
HTTP Status Codes
Complete reference for all HTTP status codes. Grouped by category, searchable, with descriptions, use cases, and RFC links.
MIME Types
Searchable MIME type reference for 200+ file types. Look up by extension or MIME string. Shows content-type headers and common usage.
Cron Expression
Build, parse, and validate cron expressions visually. Human-readable descriptions, next 10 run times, and common presets.
Keyboard Tester
Test every key on your keyboard. Shows key code, key name, event code, and modifier states. Detect stuck keys and verify layout.
Character Map
Browse and search Unicode characters by name, category, or codepoint. Copy characters, HTML entities, CSS escapes, and Unicode notation.
IP Subnet Calculator
Calculate subnet masks, network/broadcast addresses, host ranges, and CIDR notation. Supports IPv4 with wildcard and binary views.
Port Reference
Searchable reference of well-known TCP/UDP port numbers. Covers 150+ common services: HTTP, SSH, FTP, databases, messaging, and more.
Device Test
Detect battery level, screen specs, network connection type, RAM, CPU cores, GPU renderer, touch support, and storage quota using browser APIs.
Bulk URL Opener
Open multiple URLs at once in separate tabs. Paste one URL per line, validate, set delay between opens, and track recently opened URLs.
What is My IP
Instantly see your public IP address as seen by our server. Shows User-Agent, Accept-Language, and works behind VPNs and proxies.
WHOIS Lookup
Look up domain registration details via live WHOIS TCP queries. Shows registrar, creation/expiry dates, name servers, and full raw WHOIS data.
Frequently Asked Questions
- Are the lookup tools making real network requests?
- Some do: WHOIS lookups, IP checks, and the page speed tool all fetch real data. Others like the timezone converter and unit converter are purely local calculations.
- Is the 'What's My IP' result accurate?
- It shows your public IP as seen from outside: the same address websites see when you connect. If you're on a VPN, it'll show the VPN's exit IP instead.
- Can I run a WHOIS lookup on any domain?
- Yes. WHOIS data is publicly accessible for any registered domain.
- What does the browser info tool show?
- Your browser version, OS, screen resolution, color depth, timezone, language settings, and whether cookies and JavaScript are enabled. Handy for debugging or putting together a support ticket.
- Does the broken link checker work on any website?
- It checks the URLs you provide. Sites with strict CORS policies may block external checks: in those cases a browser extension or server-side crawler would work better.