SSL/TLS
SSL Certificate Checker
Verify SSL/TLS certificate details — issuer, expiry, chain, HSTS. Response time in ms.
Quick answer
Use this SSL checker to confirm certificate validity, hostname match, chain trust, and HSTS posture before launch or incident triage.
Certificate check runs on our server — results in seconds.
About this tool
SSL/TLS trust affects user confidence, browser warnings, and crawlability. This tool helps you quickly validate transport security signals and prioritize remediation.
How to use
- Enter a hostname or URL (for example: example.com or https://example.com).
- Run the check and inspect issuer, expiry, SAN coverage, and chain trust indicators.
- Fix detected issues, then re-run this checker and related header checks.
Common use cases
- Pre-release SSL checks before deploying login, checkout, or API endpoints.
- Incident triage when users report certificate or browser trust warnings.
- Routine SEO and security hardening checks across critical landing pages.
Example inputs
example.comhttps://google.comCommon issues and fixes
Certificate expired
The SSL certificate has passed its valid-to date. Renew the certificate with your CA.
Certificate not trusted
Missing or incorrect intermediate certificates. Include the full chain in your server config.
Hostname mismatch
The domain does not match the certificate SAN. Add the domain to the cert or use a SAN cert.
Mixed content on HTTPS pages
Secure pages still load HTTP assets. Update links to HTTPS to avoid browser trust degradation.
Recommended remediation
Renew expired certs via Let's Encrypt, Cloudflare, or your CA. Ensure the full chain is served. Add HSTS header for stronger security.
Pro tips
- Monitor certificates with renewal alerts at least 30 days before expiry.
- Include all production and redirect hostnames in SAN coverage.
- Validate SSL together with HSTS and CSP to reduce partial-security configurations.
FAQ
Does a valid SSL certificate guarantee the site is safe?
No. SSL secures transport, but legitimacy also depends on domain trust, content integrity, and broader security controls.
What should I do if SSL is valid but users still report warnings?
Check chain completeness, hostname mismatches on redirects, and mixed content. Browser warnings often come from these gaps.
How often should we run SSL checks?
Run checks before each release, after certificate renewals, and on a recurring schedule for critical domains.
Related security tools
Run a full security check
After this tool passes, run related header and policy checks to catch transport and browser-level risks.