SSL Lookup

Free SSL Lookup Tool — Inspect Any Site's SSL Certificate

An SSL lookup reads the certificate that secures a website's HTTPS connection and shows you everything it contains: the issuer, the validity dates, the certificate chain, the signature algorithm and the domains it covers. Enter any domain and this tool returns the full certificate details in seconds.

This matters because HTTPS is a baseline ranking and trust signal — Google has used HTTPS as a ranking factor for years, and browsers actively warn users away from sites with broken or expired certificates. An expired certificate is one of the most common, most damaging and most avoidable outages there is: the moment it lapses, visitors hit a full-page security warning and bounce. Checking the expiry date before it bites you is the simplest insurance against that.

Use this tool to confirm a certificate is valid and not about to expire, to verify the chain is complete (an incomplete chain causes errors on some devices even when the cert itself is fine), to check that all the right subdomains are covered, and to confirm a modern, secure signature algorithm. It's equally useful for auditing your own sites and for vetting a host or partner before you trust them with traffic.

From one check to a complete audit

This tool checks one thing. Smart SEO Audit checks 50+ — technical, on-page, content and speed — on any URL in under 10 seconds, with an AI-prioritized fix list, scheduled monitoring and Swiss, GDPR-compliant hosting. Start free — 5 full audits a month, no credit card.