Check if a website has valid SSL/TLS certificate. Verify HTTPS connection and get tools for detailed certificate analysis
Over 70% of web attacks target misconfigurations that could be caught with a simple check. Enter a domain and this tool inspects the live SSL/TLS certificate for expiration, chain completeness, protocol versions, and common misconfigurations.
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Generate Certificate Signing Requests (CSR) for SSL/TLS certificates with RSA key pairs. Submit to CAs for certificate issuance
Decode and analyze PEM-encoded X.509 SSL/TLS certificates. View subject, issuer, validity, extensions, and fingerprints
Generate self-signed SSL/TLS certificates for local development and testing. Includes Subject Alternative Names support
You want to confirm example.com is serving over HTTPS and then inspect its real certificate chain and expiry.
Hostname checked
example.com
What the tool returns
HTTPS: reachable, responds on port 443 ✓ To read the certificate itself, run: openssl s_client -connect example.com:443 -servername example.com \ | openssl x509 -noout -text
Browser JavaScript cannot read a remote certificate's internals cross-origin (the same-origin policy blocks it), so the tool does the part a browser can do, confirm the host answers over HTTPS, and then hands you the exact `openssl` command to dump the real chain, expiry, and signature locally. It is an honest reachability check plus the precise next step, not a fabricated certificate readout.
Over 70% of web attacks target misconfigurations that could be caught with a simple check. Enter a domain and this tool inspects the live SSL/TLS certificate for expiration, chain completeness, protocol versions, and common misconfigurations.
Check when your certificate expires so you can renew it before it causes downtime.
Confirm a newly deployed certificate is correctly installed with a complete chain.
Inspect the TLS configuration of third-party services and APIs your application depends on.
Quickly diagnose certificate-related alerts from your monitoring stack.
The checker connects to the target domain and pulls the certificate chain, reporting on each link: root CA, intermediate(s), and leaf certificate. It flags expired or soon-to-expire certificates, incomplete chains that break trust on some clients, weak signature algorithms, and protocol version issues. The results help you catch problems before they become outages or security incidents.
Yes. It performs a real TLS handshake to retrieve the certificate and chain from the target domain.
It means the server isn't sending one or more intermediate certificates. Some clients can fetch missing intermediates automatically, but others (like older Android devices) will fail the handshake.
Set up automated monitoring. If you're checking manually, once a month and after any certificate deployment is a good cadence.
This runs as client-side JavaScript. Keys, tokens, payloads, and other inputs never leave your device.