🌐 Web Utilities
Inspect HTTP headers, DNS records, SSL certificates and security.
- URL Parser
Break a URL down into its protocol, host, path, query parameters and hash.
- Aspect Ratio Tester
Reduce a width×height pair to a simplified ratio (e.g. 1920×1080 → 16:9) and preview it.
- Viewport Tester
Preview a website at common device widths — phone, tablet, laptop and desktop.
- Open Graph / Twitter Card Preview
Paste a page's HTML source to preview how its Open Graph and Twitter Card tags render as a social share card.
- HTTP Status Checker
Check the HTTP status code a URL returns, following any redirects.
- Redirect Chain Viewer
See every hop a URL redirects through before landing on its final destination.
- URL Expander
Reveal the real destination behind a shortened or tracking link before you click it.
- HTTP Headers Checker
See every HTTP response header a URL returns.
- Security Headers Checker
Check a URL for common HTTP security headers (HSTS, CSP, X-Frame-Options and more).
- CORS Header Checker
Inspect a URL’s Access-Control-* response headers to see what cross-origin access it allows.
- Compression Checker
Check whether a URL’s response is served compressed (gzip/brotli) and with what Vary header.
- Robots.txt Checker
Fetch and parse a live site’s robots.txt — user-agent rules and listed sitemaps.
- Sitemap Checker
Fetch and validate a live site’s sitemap.xml — entry count and a preview of the URLs.
- DNS Lookup
Look up A, AAAA, MX, TXT, CNAME or NS records for a domain.
- SSL Certificate Checker
Look up a domain's SSL/TLS certificate — issuer, validity dates and days until expiry — from public Certificate Transparency logs.