Check the encryption, issuer, and expiration date of any public web domain certificate instantly.
Since browsers restrict cross-domain security inspections, this tool uses a specialized API to analyze the SSL certificate of your requested domain and return detailed validation data.
SSL certificates vary in validity periods. Our checker helps you stay informed of your expiration status, providing clear alerts if a certificate is approaching its renewal date.
Many certificates cover multiple sub-domains. Our tool identifies Subject Alternative Names (SAN), showing you all the hostnames protected by a single certificate.
An SSL (Secure Sockets Layer) certificate encrypts the data transmitted between a user's browser and the web server. This ensures that sensitive information, like login credentials, is protected from unauthorized access.
Certificates expire to ensure security standards are maintained and domain ownership is verified regularly. Most modern certificates are valid for anywhere from 90 days to one year.
If a domain SSL expires, modern web browsers (Chrome, Safari, Firefox) will completely block visitors from entering the site natively, displaying a massive red "Your connection is not private" warning screen. This will instantly devastate search rankings and user trust.