Mobile-First Indexing: What It Means for You
Google indexes the mobile version of your site. If mobile is weaker than desktop, rankings suffer.
Read article →Inspect the live TLS certificate: issuer, validity dates, days remaining and SAN domains.
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The SSL Certificate Checker is a free tool that connects to any domain over HTTPS and inspects the live TLS certificate it presents. It reports the issuer, the validity window, how many days remain before expiry and every domain covered by the certificate's Subject Alternative Names. Instead of clicking through a browser's padlock menu, you get the real certificate details in one view — perfect for catching a certificate that is about to expire or one that does not cover the domain you typed.
example.com) that serves HTTPS.www and all subdomains.Check example.com and you might see a certificate issued by Let's Encrypt, valid for 90 days with 47 days remaining, covering both example.com and www.example.com in its SAN list — clear confirmation HTTPS is healthy and the renewal is not yet urgent.
Yes — completely free, with no signup and no usage limits. Check as many domains as you need.
Yes. HTTPS is a confirmed Google ranking signal, and an expired or mismatched certificate triggers browser warnings that drive visitors away. Keeping a valid certificate is part of basic technical health.
Renew or reissue it through your host or certificate authority, then recheck here to confirm the new dates. To plan a clean move to HTTPS, read our HTTPS migration guide and verify the redirect setup with the Redirect & HTTP Status Checker and HTTP Header Checker tools.
Guides, tips and tutorials hand-picked for this tool — go from running a check to actually fixing it.
Google indexes the mobile version of your site. If mobile is weaker than desktop, rankings suffer.
Read article →HTTPS is a ranking signal and a trust requirement. Here is how to migrate safely.
Read article →DNS records are the hidden settings that route a domain's traffic, email and verification. Here is what A, AAAA, CNAME, MX, TXT and NS records do, how to read them, and how to check each one for free.
Read article →A WHOIS lookup reveals a domain's registrar, creation and expiry dates, name servers and — when it is not hidden by privacy — its owner. Here is what a WHOIS record means, how to find who owns a domain, and what to do when the owner is redacted.
Read article →Faster pages rank better and convert better. Here is a prioritized checklist that actually moves the needle.
Read article →Crawlability, indexability, speed and structured data — the technical foundations that let your content rank.
Read article →Retrieve real domain registration data: registrar, creation/expiry dates, name servers and status.
Open tool →Query live A, AAAA, MX, NS, TXT, CNAME, SOA and SRV records for any domain.
Open tool →View raw response headers, server software, caching, security headers and content type of any URL.
Open tool →Trace the full redirect chain (301/302/307) of a URL and verify the final status code.
Open tool →Resolve a domain/IP and get real geolocation, ISP, ASN and hosting organization data.
Open tool →Fetch and parse a site’s robots.txt, list rules per user-agent and locate sitemap declarations.
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