Check an SSL Certificate
Enter a domain to check certificate issuer, validity dates and whether the SSL certificate appears valid.
Results
What Is an SSL Certificate?
An SSL certificate helps encrypt data between a website and its visitors, allowing the site to load securely over HTTPS.
Checking SSL status is useful when investigating browser warnings, expiry dates, wrong-domain issues or HTTPS setup problems.
- Check certificate issuer and common name
- Check validity dates
- Spot expired or unreachable certificates
- Support HTTPS troubleshooting
Free SSL certificates
Many hosting plans include free SSL certificates, often using providers such as Let’s Encrypt.
Practical Checks
How to Read SSL Checker Results
SSL results help confirm whether HTTPS is configured correctly for a domain.
Common name
The certificate should match the domain or hostname visitors are using.
Issuer
Shows which certificate authority issued the SSL certificate.
Expiry date
Expired SSL certificates can trigger browser warnings and reduce visitor trust.
SSL Troubleshooting Checklist
- Confirm the domain points to the correct hosting server.
- Check the certificate has not expired.
- Check redirects from HTTP to HTTPS.
- Review mixed content if pages still show browser warnings.
Website Tools
More Free Website Tools
Use these related tools to check DNS, SSL, headers, website status, speed, IP information and domain details.
SSL Checker FAQs
Why does an SSL certificate expire?
SSL certificates are issued for a limited period and must be renewed before expiry.
Why does my browser show an SSL warning?
Common causes include expired certificates, incorrect domains, mixed content or redirect issues.
Is SSL needed for SEO?
HTTPS is expected for modern websites and helps protect visitors while supporting trust signals.
Can SSL fail after changing hosting?
Yes. If the domain points to a new server, the SSL certificate may need to be issued or installed again.
What is mixed content?
Mixed content happens when an HTTPS page loads some files over HTTP, which can trigger browser warnings.