About SSL Certificate Check
SSL certificate checker validates HTTPS certificates online: validity, expiration, cert chain, encryption strength. Essential for website security checks, certificate renewal reminders, SSL config diagnostics.
How to Use
- Enter domain (with https://)
- View certificate issuer and validity
- Check certificate chain integrity
- View encryption protocol and key strength
Frequently Asked Questions
- SSL vs TLS difference?
- SSL (Secure Sockets Layer) is deprecated old protocol. TLS (Transport Layer Security) is SSL successor. Today's 'SSL certificate' actually means TLS certificate, TLS 1.2/1.3 current standards.
- What is certificate chain?
- Certificate chain is trust chain from site cert to root cert. Browser verifies: site cert → intermediate cert → root cert (pre-installed in system). Any break shows insecure warning.
- Are free SSL certificates (Let's Encrypt) reliable?
- Reliable. Let's Encrypt is non-profit CA, browser trust same as paid certs. Differences: 3-month renewal, no wildcard (free tier), no EV green bar, no tech support. Perfectly fine for small sites.