SSL Certificate Checker

Inspect the certificate presented by a public HTTPS endpoint and see the expiry window, issuer, hostname coverage, and validation result.

Issuer + subject Expiry window Validation result
Public HTTP and HTTPS targets only.

Inspect the live certificate

Enter a URL in the field above to get started. You will see who issued the certificate, when it expires, whether validation passed, and whether the HTTPS endpoint is reachable.

When to use this

You are close to a renewal window and want a quick expiry check.

Users report browser security warnings or TLS handshake failures.

You changed CDN, load balancer, or origin routing and want to confirm the public certificate stayed healthy.

Need expiry monitoring?

CheckHTTP can keep watching the endpoint for you and alert before certificate problems become user-visible downtime.

Start monitoring free

Frequently Asked Questions

No. It is read-only. The tool inspects the certificate currently served by the public HTTPS endpoint.

Certificates are tied to names. Redirects, CDN changes, and alternate hostnames can expose gaps even when the main domain looks healthy.

Many teams alert 30 days before expiry and again closer to the deadline. The right threshold depends on your renewal process and ownership model.