DNS & domain lookup

SSL Certificate Checker

Check a domain's SSL/TLS certificate over a real connection: issuer, validity, SANs, chain and days to expiry. Free SSL checker, live results.

Check an SSL certificate

Enter a domain to inspect its live SSL/TLS certificate over a real connection.

What this SSL checker does

Opens a real TLS connection to the host
Shows the certificate subject, issuer and SANs
Reports validity dates and days until expiry
Confirms whether the chain is trusted
Detects expired and self-signed certificates
Uses the actual served certificate — not logs

Common use cases

  1. 1Confirming HTTPS is set up correctly
  2. 2Checking when a certificate expires
  3. 3Diagnosing browser security warnings
  4. 4Verifying the certificate covers your hostname
  5. 5Auditing a certificate after installation
  6. 6Checking a certificate before go-live

Related tools

SSL chain validatorSSL expiry monitorCertificate transparency searchCAA record generatorDomain Status Code CheckerDNS Health Checker

About SSL/TLS certificates

An SSL/TLS certificate encrypts traffic between your site and its visitors and proves your domain's identity. Browsers trust it only when it is unexpired, covers the hostname, and chains to a recognised certificate authority. Any gap triggers a security warning that scares users away.

This checker opens a genuine TLS connection and reads the actual served certificate — issuer, validity, SANs and chain — so you see exactly what visitors' browsers see. Renew before expiry and ensure the full chain is served.

More Free Tools Where This Came From

This utility is one of dozens of free, no-login tools for DNS, email, SEO and developers — all instant and private.

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HostCloud.in  ·  Pune, India  ·  Serving 34,987+ Websites Since 2020

FREQUENTLY ASKED QUESTIONS

Got Questions? We Have Answers.

What does the SSL certificate checker do?

It opens a real TLS connection to your domain and reads the served certificate — subject, issuer, validity dates, SANs and chain — then reports whether it is trusted and when it expires.

Does it use the actual served certificate?

Yes. Unlike log-based tools, it connects to your server and reads the certificate visitors' browsers actually receive.

Why does it say "not trusted"?

Common causes are an expired certificate, a self-signed certificate, a missing intermediate, or a hostname the certificate does not cover. The tool names the reason.

What are SANs?

Subject Alternative Names are the hostnames a certificate is valid for. A certificate must list the exact hostname a visitor uses, or the browser rejects it.

Can it check a non-standard port?

Yes. Append a port (for example example.com:8443) to inspect a certificate served on that port.

Is the check live?

Yes. It performs a real TLS handshake at the moment you run it — no cached data.