Free SSL Certificate Checker
SSL certificates keep websites secure by encrypting connections and verifying id...SSL certificates keep websites secure by encrypting connections and verifying identity. This tool checks any domain's SSL configuration - certificate ...
SSL Grade Reference
What's Analyzed
Why Use Free SSL Certificate Checker?
Complete Security Analysis
Get a full breakdown of certificate details, TLS protocol version, cipher strength, HSTS status, and an overall security grade from A+ to F.
Expiration Monitoring
See exactly when your certificate expires and how many days remain. Catch expiring certificates before they cause browser warnings and lost visitors.
Certificate Chain Verification
View the complete certificate chain from your site to the root CA. Identify missing intermediate certificates that cause trust issues.
Instant Results
No waiting around - get complete SSL information in seconds. We connect directly to your domain and retrieve live certificate data.
Works with Any Domain
Check any website's SSL certificate - your own sites, competitor sites, or any domain you're curious about. Subdomains work too.
No Account Required
Just enter a domain and check. No signup, no email, no limits. Use it as often as you need to monitor your certificates.
Who Uses SSL Checkers
Website Owners
Monitor your SSL certificates to avoid embarrassing expiration warnings. Set a reminder to check monthly or before your renewal date.
DevOps & SysAdmins
Verify certificate installations after deployment. Check TLS configuration, confirm the certificate chain is complete, troubleshoot HTTPS issues.
SEO Professionals
Ensure client sites have valid SSL - it's a Google ranking factor. Check competitor security configurations. Verify before site migrations.
Security Auditors
Assess website security posture as part of audits. Document certificate details, identify weak configurations, verify compliance requirements.
How It Works
Enter Your Domain
Type the domain you want to check. You can include https:// or just enter the domain name - we handle the formatting. Works with subdomains like mail.example.com too.
Check the Certificate
Click the button and we'll connect to your domain over HTTPS, retrieve the certificate, and analyze its configuration. Takes just a few seconds.
Review Your Results
See your security grade, certificate details, expiration date, issuer info, TLS version, and any issues. Expand sections to see the full certificate chain and all alternative names.
SSL Best Practices
Set Up Automatic Renewal
If you're using Let's Encrypt, set up certbot or your hosting panel to renew automatically. Most hosting providers do this by default. Manual renewals are easy to forget, and an expired certificate means browser warnings and lost traffic.
Don't Forget Intermediate Certificates
If your certificate works in some browsers but not others, you're probably missing intermediate certificates. Your CA provides these - install them alongside your site certificate. Without them, some clients can't verify the trust chain.
Test After Any Server Changes
After updating server software, changing hosting, or modifying web server config, check your SSL again. Configuration changes can accidentally disable TLS, enable weak ciphers, or break the certificate chain.
Enable HSTS After Testing
HSTS improves security but locks you into HTTPS. Test your site thoroughly, ensure SSL works on all subdomains, then enable HSTS with a short max-age first. Increase the duration after confirming everything works.