Free SSL/TLS Certificate Checker

An SSL/TLS certificate encrypts the data exchanged between your website and its visitors, protecting sensitive information such as passwords and payment details. It is essential for security, user trust and SEO – Google marks HTTP sites as 'Not secure' and uses HTTPS as a ranking signal. Every modern website should have a valid SSL certificate. Also make sure to use a HTTP to HTTPS redirect checker to confirm that all insecure traffic is properly redirected.

Check your SSL certificate monthly, especially 60 to 90 days before it expires. Many certificates are valid for 90 days (Let's Encrypt) or 1 year. Set up automated monitoring or renewal to avoid expiry, which triggers browser warnings and breaks user trust. Most hosting providers offer automatic SSL certificate renewal.

Certificate chain validation ensures your SSL certificate is properly linked to a trusted Certificate Authority (CA). An invalid chain means intermediate certificates are missing or misconfigured. This triggers browser security warnings even if your certificate itself is valid. Contact your SSL provider or hosting company to fix certificate chain issues.

Self-signed certificates provide encryption but are not trusted by browsers – visitors see alarming security warnings. They are fine for internal testing or development environments, but NEVER use self-signed certificates on public websites. Use free certificates from Let's Encrypt or paid certificates from trusted certificate authorities (DigiCert, Sectigo, GlobalSign) for production sites.

Use TLS 1.2 or TLS 1.3 (the latest and most secure). Older protocols (SSL 2.0, SSL 3.0, TLS 1.0, TLS 1.1) have known vulnerabilities and are deprecated. Modern browsers and servers support TLS 1.2+ by default. Disable the old protocols in your server configuration to maintain strong security.

Renew your certificate immediately if it expires in less than 30 days. Most SSL providers send renewal reminders 60 to 90 days before expiry. If you use Let's Encrypt, enable automatic renewal through Certbot. If you use a paid certificate, renew it with your provider. After renewal, update your server configuration and confirm the new certificate is active.