Free website checker tools

These tools run the same kind of read-only checks SiteMon uses before monitoring a site, but as one-off lookups you can run from your browser. Enter a domain or URL and the result is rendered on this page — no account, no JavaScript required. Each checker looks at one slice of site health: whether HTTPS is configured correctly, whether the home page responds quickly, and whether basic security and search headers are present. They are useful before you sign up for ongoing monitoring, or when you want a second opinion on a single issue. Nothing here changes your site. We fetch only what is needed for the check, cap how much data we read, and refuse private or internal addresses so the tools cannot be used to scan your network.

• SSL certificate checker — issuer, expiry, chain and hostname match.
• Uptime checker — HTTP status, response time, TTFB and redirects.
• Security & SEO headers — HSTS, CSP, title, canonical, robots and sitemap.

Want everything in one PDF? Request the free site health report.