🔒 SSL Certificate Checker

Check SSL/TLS certificate validity, expiration date, issuer details, and encryption strength for any domain. Ensure your website is secure and trusted by visitors.

🛡️ Why Check SSL Certificates?

Security: Verify your site has valid encryption
Trust: Valid SSL builds visitor confidence
SEO: Google ranks HTTPS sites higher
Expiration: Prevent certificate expiry issues
Compliance: Meet security standards

📋 How to Use the SSL Certificate Checker

Type a domain such as example.com, or paste a full https:// URL.
Select Check SSL Certificate and wait a few seconds while the tool connects to the server.
Read the validity status, issuer, expiry date and days remaining.
Check the signature algorithm and serial number if you need to match them against your certificate records.

🎯 When to Use It

Before launching a new site, to confirm the certificate matches the domain.
Monthly, to catch certificates that are close to expiry before visitors see browser warnings.
After renewing or moving hosts, to check the new certificate is the one being served.
When a customer reports a security warning and you need to find out why.

💡 Tips & Common Pitfalls

Check both the bare domain and the www version. Each can serve a different certificate.
A certificate that expires in under 30 days is flagged. Automatic renewal such as Let's Encrypt with certbot can fail silently, so keep checking.
A valid certificate does not mean a site is safe. It only means the connection is encrypted and the domain matches.
If the check fails but your browser works, the server may only present the certificate to some clients, for example when it relies on SNI.

❓ Frequently Asked Questions

What is an SSL certificate?

SSL (Secure Sockets Layer) certificates encrypt data between browsers and servers. They verify website identity and enable HTTPS, shown by the padlock icon in browsers.

How do I know if my SSL is valid?

A valid SSL certificate must be issued by a trusted authority, match the domain name, and not be expired. This tool checks all these factors automatically.

What happens when SSL expires?

Browsers show security warnings, blocking most visitors. Search rankings may drop. Renew certificates before expiration to avoid issues.

What's a good encryption strength?

Modern SSL certificates should use 2048-bit or 4096-bit RSA keys. Anything less than 2048-bit is considered weak and outdated.

Do I need SSL for my website?

Yes! SSL is essential for all websites. It's required for SEO, builds trust, and protects user data. Most hosts offer free SSL through Let's Encrypt.