HTTP Header Checker
★★★★★★★★★★5.0(0 ratings)👁 2❤ 0
Inspect every HTTP response header: status code, content-type, cache, HSTS, CSP, X-Frame-Options, and more.
SSL Certificate Checker
★★★★★★★★★★5.0(0 ratings)👁 2❤ 0
Check any website's SSL/TLS certificate: validity, issuer, expiry date, days remaining, and SANs.
SSL Certificate Checker
Uses the public sslcheck.globalsecuritymag.com API — returns live certificate data for any public HTTPS domain.
Certificate Details—
About This Tool
What This Reports
- Certificate validity status
- Issuer (Let’s Encrypt, DigiCert, etc.)
- Valid from / Expires dates
- Days until expiry
- Covered domains (SANs)
Common Issues
- Expired — renew immediately (free with Let’s Encrypt)
- Wrong domain — certificate doesn’t include your domain
- Self-signed — not trusted by browsers
Frequently Asked Questions
Why is my certificate expiring soon?
Let's Encrypt certificates are valid 90 days and need auto-renewal. Most hosts handle this automatically. If yours doesn't, set up certbot or contact your hosting support.
What if the checker returns no data?
The domain may not have HTTPS, the certificate may be self-signed (not publicly logged), or it may be behind a WAF. Try opening the site in Chrome and clicking the padlock icon for manual inspection.
Does it work for subdomains?
Yes u2014 enter the full subdomain like blog.example.com. The SANs field shows all domains and wildcards covered by the certificate.