SSL Certificate Checker

Check SSL certificate details for any domain. View expiry date, issuer, and certificate chain.

warningMixed Content

Page loaded over HTTPS but includes HTTP resources (images, scripts). Fix: use relative URLs or HTTPS for all resources.

errorExpired Certificate

Certificate past its valid-until date. Browsers will show a full-page warning. Fix: renew the certificate.

errorSelf-Signed Certificate

Not signed by a trusted CA. Only suitable for development. Fix: use Let's Encrypt (free) or a commercial CA.

errorName Mismatch

Certificate CN/SAN does not match the domain. Fix: reissue certificate with correct domain names.

warningWeak Protocol (TLS 1.0/1.1)

Outdated TLS versions with known vulnerabilities. Fix: configure server to support only TLS 1.2+.

warningMissing HSTS Header

Without Strict-Transport-Security, browsers may attempt HTTP first. Fix: add HSTS header with appropriate max-age.

warningIncomplete Certificate Chain

Missing intermediate certificates cause errors in some clients. Fix: configure server to send the full chain.

warningWeak Cipher Suites

Server supports insecure ciphers (RC4, DES, 3DES). Fix: use modern cipher suite configuration.

Frequently Asked Questions

How do I use SSL Checker?

Enter your domain name and the tool checks your SSL certificate's validity, expiry date, issuer, and configuration.

Is SSL Checker free?

Yes, SSL Checker on ToolPix is 100% free with no signup or installation required.

Is my data safe?

All processing happens in your browser, your data never leaves your device.

What SSL details are checked?

Certificate validity, expiry date, issuer authority, domain match, chain completeness, and protocol/cipher support.

How early should I renew an SSL certificate?

Renew at least 30 days before expiry. Most certificate authorities send renewal reminders 90, 60, and 30 days in advance.