Domain Trust Watch / Free SSL checker
Free SSL checker
Check the certificate this domain serves right now.
Inspect expiry, issuer, SANs, fingerprint, chain depth, hostname match, and validation state before a renewal, CDN cutover, incident handoff, or monitor setup.
Result opens automatically
Issuer, expiry, fingerprint, SANs, chain depth, and validation state load on the full result page after the probe completes.
Checker result
A one-time SSL check before you create a monitor.
The checker result shows issuer, expiry, runway, SAN count, chain depth, fingerprint, and validation state for one public hostname.
Snapshot map
The result separates connection failure from certificate identity.
A useful certificate check should not collapse every problem into a single error. These fields make renewal, chain, and hostname issues easier to hand to the right owner.
Check public DNS records, nameservers, and whether the hostname should resolve publicly.
Check port, firewall, CDN proxy status, load balancer listener, and public reachability.
Check SNI, listener configuration, TLS protocol support, and whether the port is actually serving TLS.
Check SAN coverage, SNI hostname, CDN certificate binding, and load balancer certificate selection.
Check renewal status, deployment target, service reload, and whether the public endpoint changed.
Check intermediate bundle, chain order, issuer trust, and origin versus edge certificate.
Confirm the endpoint serves the renewed certificate, not the old one cached behind a CDN.
Check the exact public hostname before handing traffic to a new edge or load balancer.
Separate an expired certificate from DNS, TCP, TLS, or trust-chain failure.
Verify the hostname, names, issuer, chain, and expiry before guessing which layer failed.
What the SSL checker tells you.
The checker reads public TLS metadata from the served certificate. It can confirm the issuer, names, expiry date, fingerprint, chain depth, and validation state, and it separates DNS, TCP, TLS, and certificate failures.
Use it before adding a monitor.
A one-time check is useful before creating a monitor, after renewal, after DNS or CDN changes, or when a hostname mismatch or trust-chain problem needs a fast read.
Monitor important hostnames over time.
A one-off check answers what is served now. If this hostname matters next month too, monitoring adds scheduled checks, history, and warnings to email, Slack, or a webhook.
Temporary result links are for short-term sharing.
Anonymous result links expire after 24 hours and can be hidden early. Use them to hand a current check to a teammate, then create a monitor when the hostname needs ongoing history and alerts.
What is an SSL certificate checker?
An SSL certificate checker is a one-time probe that connects to a public hostname and reports the certificate currently served by that hostname. It helps diagnose expiry, hostname mismatch, trust-chain, and certificate metadata issues.
What does scheduled monitoring add?
Scheduled monitoring repeats the check, stores certificate history, detects public certificate changes, applies expiry thresholds, sends alerts, and records delivery attempts so the team can see what happened.
Related docs
Probe failures have different owners.
DNS, TCP, TLS handshake, and certificate validation failures are separated so the right person can act.
FAQ4 answers
Is the SSL certificate checker free?
Yes. The SSL certificate checker can run a one-time public TLS check without an account. Scheduled monitoring is available when the hostname needs repeated checks.
What data does the checker inspect?
The checker inspects public TLS certificate metadata such as issuer, SANs, validity dates, fingerprint, chain depth, validation state, and hostname match. It also separates DNS, TCP, and TLS handshake failures.
Does the checker need private keys?
No. Domain Trust Watch reads public certificate metadata from the TLS handshake. It never asks for private keys or server credentials.
How is monitoring different from one check?
Monitoring repeats checks on a schedule, applies expiry thresholds, records certificate history, detects changes, sends alerts, and stores delivery attempts.