Free SSL Certificate Checker
Enter a domain to inspect its SSL/TLS certificate. You'll see the issuer, validity dates, days until expiry, protocol version, and whether the certificate chain is healthy. Useful for catching expiring certificates before they cause browser warnings.
What this tool checks
- Certificate issuer and subject details
- Valid-from and valid-to dates with days until expiry
- TLS protocol version (1.2, 1.3)
- Certificate chain validation
- Custom port support for non-standard setups
Automate this with the API
Run this tool programmatically from your code. Get a free temporary API key with 200 requests — or register for unlimited access.
curl https://apixies.io/api/v1/inspect-ssl?domain=... \
-H "X-API-Key: YOUR_API_KEY"
Frequently asked questions
What does this SSL checker verify?
It connects to the domain over HTTPS, retrieves the certificate, and checks the issuer, validity period, protocol version, and chain integrity. It does not perform a full vulnerability scan — it focuses on certificate health.
Can I check SSL on a non-standard port?
Yes. The API supports a port parameter, so you can check services running on ports other than 443.
How often should I check my SSL certificates?
At minimum, once a week for production domains. Many teams automate this with the API to get alerts when certificates are within 30 days of expiry.
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