Free tool
Check an SSL certificate in seconds.
Enter a domain and we connect to it over HTTPS. You see whether the certificate is valid, who issued it, which domains it covers and when it expires.
What this check does
We open a secure connection to the domain on port 443, verify the certificate chain and check that the certificate matches the domain name.
Why certificates still expire
Automatic renewal fails more often than you would think: a DNS change, a firewall rule or a moved server is enough. Browsers then show a full-page warning and most visitors leave.
Never miss an expiry again
A one-time check tells you about today. nopanic checks every certificate every hour and warns you well before it expires.
Frequently asked questions
What does "could not be verified" mean?
The browser would not trust this certificate. Common causes are a missing intermediate certificate, a self-signed certificate or a certificate for a different domain.
How long are SSL certificates valid?
Since March 2026 public certificates are valid for at most 200 days, and that maximum drops step by step to 47 days in 2029. Let's Encrypt certificates are currently valid for 90 days. Shorter lifetimes make automatic renewal, and monitoring it, essential.
Can I check a different port?
This free check uses port 443. In nopanic the certificate check follows the url of each project, including its port.
All of this for every client site, in one place.
Monitoring, errors, debugging and security for every Laravel app you run. Hosted and processed in the EU.
