SSL Certificate Checker
Check SSL certificate validity, expiration date, and security details
🛡️What is an SSL Certificate?
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables an encrypted connection. SSL certificates are what enable websites to use HTTPS, which is more secure than HTTP.
When a browser connects to an SSL-secured website, the SSL certificate provides three key security features: Encryption (data cannot be read by third parties), Authentication(verifies the website is legitimate), and Data Integrity (ensures data hasn't been tampered with).
Why Check SSL Certificates?
Prevent Expiry
Expired certificates cause browser warnings and loss of visitor trust.
SEO Impact
Google uses HTTPS as a ranking signal. Invalid SSL hurts your SEO.
User Trust
The padlock icon builds confidence and increases conversions.
Types of SSL Certificates
Domain Validated (DV)
Basic validation with quick issuance (minutes). Only verifies domain ownership through email or DNS. Ideal for blogs, personal sites, and internal applications. Free options available through Let's Encrypt.
Organization Validated (OV)
Verifies organization identity through business documents. Shows company name in certificate details. Takes 1-3 days to issue. Recommended for business websites and customer-facing applications.
Extended Validation (EV)
Highest level of validation with rigorous verification. Requires legal, physical, and operational checks. Best for e-commerce, banking, and high-security applications. Takes 1-2 weeks to issue.
SSL/TLS Protocol Versions
SSL (Secure Sockets Layer) has evolved into TLS (Transport Layer Security). Modern websites should use TLS 1.2 or TLS 1.3, as older versions have known vulnerabilities. TLS 1.3, released in 2018, offers improved security and faster handshakes.
When checking SSL certificates, pay attention to the protocol version. If a server only supports TLS 1.0 or 1.1, it may be vulnerable to attacks like POODLE or BEAST. Most browsers now block connections to servers using these deprecated protocols.
Deprecated
Deprecated
Acceptable
Recommended
Common SSL Certificate Issues
Set up automated renewal with certbot or your CA's tools.
Certificate doesn't match domain. Use SAN or wildcard certificates.
Missing intermediate certificates. Install the full certificate chain.
Not trusted by browsers. Use a trusted CA for production sites.
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