SSL / HTTPS Checker
FreeThe SSL / HTTPS Checker connects to any domain, reads its TLS certificate, and reports the issuer, validity dates, days until expiry and the domains it covers — so you are never caught out by an expired certificate.
How to use the SSL / HTTPS Checker
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1
Enter a domain
Type the domain or URL you want to check.
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2
Run the check
Click Check certificate to connect over HTTPS.
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3
Review the result
See the certificate details and expiry warning.
Features
- Reads the live TLS certificate
- Shows issuer and validity dates
- Counts days until expiry
- Lists covered domains (SANs)
When to use it
- Confirm a certificate is valid and not expiring
- Check which domains a certificate covers
- Verify HTTPS is set up correctly
Frequently asked questions
HTTPS is a confirmed Google ranking signal and is required for many modern browser features. Browsers also warn visitors away from non-HTTPS pages.
Visitors see a security warning and most will leave. Search engines may also flag the site as insecure. Renew certificates before they expire — the checker shows the days remaining.
A Subject Alternative Name (SAN) lists every hostname a certificate is valid for, such as example.com and www.example.com.
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