TOOLS

SSL Certificate Checker

Verify your website's SSL/TLS certificate. Check expiration dates, certificate chain, issuer details, and security configuration. Free to use. No signup required.

We'll connect to port 443 and analyze the SSL/TLS certificate, including validity, chain, and security settings.

SSL Certificate for

Issued To:
Issued By:
Valid From:
Valid Until:
days remaining

Security Checks

Certificate Details

Common Name (CN)
Organization
Issuer
Signature Algorithm
Serial Number
Validity Period
days ( days old)

Subject Alternative Names (SANs)

Domains covered by this certificate

+ more

Certificate Chain

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Need continuous SSL monitoring?

Monitor your SSL certificates 24/7 with instant alerts before they expire. Never let an expired certificate take down your site.

Start monitoring for $5/month

FAQs

What is an SSL certificate?
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables encrypted connections between a web server and a browser. It's what makes HTTPS possible and shows the padlock icon in your browser.
What happens when an SSL certificate expires?
When an SSL certificate expires, browsers will display security warnings to visitors, which can scare them away and damage trust. Search engines may also penalize your site. It's crucial to renew certificates before they expire.
What does the certificate grade mean?
The grade reflects the overall health of your SSL certificate. Grade A means excellent (valid, not expiring soon, using modern algorithms). Lower grades indicate issues like approaching expiration, outdated algorithms, or invalid certificates.
What are Subject Alternative Names (SANs)?
SANs are additional domain names that an SSL certificate covers. For example, a certificate might cover both example.com and www.example.com. Wildcard certificates (*.example.com) can cover all subdomains.