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Website health checker

Runs concurrent checks on one domain for DNS records, DNSSEC records, HTTPS reachability, redirects, security headers, cookies, robots.txt, sitemap and email security into one scored report, and marks the SSL row as not checkable from a browser.

Press the button to run the checks

Nothing leaves this page until you do. The report scores nine checkable rows; the SSL certificate row always reads unable to check, because a browser page cannot see the certificate chain.

This is a first pass, not an audit. It reads DNSSEC record presence, not cryptographic validation; it probes /sitemap.xml only, not paths declared elsewhere; it checks five common DKIM selectors; and it cannot see the TLS certificate. Rows that could not complete sit out of the score fraction on both sides, so a timeout never reads as a broken site.

Domain

DomainOne hostname per run, like example.com

DNS resolverWhere the DNS rows ask their questions

More settings

Shared time budgetEvery check races the same clock; a missed check reports as unable

Budgets run from 5 to 20 seconds. Ten checks fire at once; nothing queues.

What leaves your browser

DNS questions go browser-direct to the DoH resolver you picked. The HTTPS, redirect, robots.txt, and sitemap probes go through this project's capped proxy server (GET only, public hosts only, size and time caps, rate-limited), because a browser cannot read cross-origin response headers or fetch plain HTTP itself. This page leaves your browser only when you press the button; never on load, never in the background. Nothing is sent anywhere else. Google Analytics still measures the visit to this page, and it never receives what you run through this tool.

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Website health checker

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