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Certificate Check

Enter a website URL or hostname to fetch and display its SSL/TLS certificate: subject, issuer, validity, subject alternative names (SANs), serial number, and fingerprint. The check is performed from this server; no input is stored.

Why check SSL/TLS certificates?

An SSL/TLS certificate check shows issuer, subject, validity dates, SANs, and fingerprint. Use it to verify HTTPS setup, catch expiry before outages, or confirm the right certificate is served.

What the fields mean

The subject is the entity the certificate was issued to (often the domain or hostname). The issuer is the Certificate Authority (CA). Valid from / to are the validity period; if the current time is outside that range, the certificate is expired or not yet valid. Subject Alternative Names (SANs) list all hostnames the certificate covers — if you use www and non-www, or mail, they should be listed. The SHA-256 fingerprint uniquely identifies the certificate and is useful to compare with your CA or config.

Quick tips

  • Set a reminder before certificate expiry; expired certs break HTTPS and hurt trust.
  • Check Subject Alternative Names (SANs) so all your hostnames (www, mail, etc.) are covered.
  • Compare the SHA-256 fingerprint with your CA or config if you suspect a wrong or replaced cert.

Things to consider

This check runs from our server; your browser may see a different chain (e.g. behind a CDN). We do not verify the chain to a root; for full validation use your browser or a dedicated validator.

ve.ms — Free tools for a more reliable internet. Last updated 2026.