SSL Certificate Checker
Check HTTPS certificate details, expiry date, issuer, subject alternative names, and validation status for any domain.
Free SSL Certificate Checker
Expired or misconfigured SSL certificates can take a website offline, trigger browser warnings, and destroy trust. This checker gives you the certificate details that matter before renewals, launches, and hosting migrations.
What this SSL checker shows
The report includes the domain, certificate issuer, subject, subject alternative names, validity window, expiry countdown, fingerprint, and whether the certificate validates for the host.
Why certificate expiry matters
When HTTPS fails, visitors see browser warnings before they can reach your site. That can cause a sudden drop in traffic, conversions, and revenue that analytics will surface after the damage starts.
Frequently Asked Questions
How often should I check my SSL certificate?
Check after every hosting or DNS change, and monitor expiry continuously. Many teams review certificates when they have fewer than 30 days remaining.
What does certificate issuer mean?
The issuer is the certificate authority that signed the certificate, such as Let's Encrypt, DigiCert, Google Trust Services, or Cloudflare.
What are subject alternative names?
Subject alternative names list the hostnames covered by a certificate. A certificate for example.com may also cover www.example.com if it appears in the SAN list.
Can an expired SSL certificate affect SEO?
Yes. If users and crawlers cannot access your site safely over HTTPS, search visibility, engagement, and conversions can all suffer.
Is this SSL checker free?
Yes. You can check certificate details and expiry for any public domain without signing up.
Настав час позбутися Google Аналітики.
Втомилися від розчарувань, складності та проблем з приватністю Google Аналітики? Ми також. Саме тому ми створили Swetrix - етичну, відкриту і повністю cookie-free альтернативу.