SSL Certificate Checker - Check SSL/TLS Certificate Details

🔒 SSL Certificate Checker

Enter any domain to check its live SSL/TLS certificate. A direct TLS handshake is made server-side — you get real-time data straight from the certificate, not cached logs.

How to check an SSL certificate

Enter a domain and see the full certificate details in seconds.

01
Enter a domain name
Type the domain you want to check — like example.com. No need to include https://.
02
View the certificate details
See the certificate's expiry date, issuer, subject, and subject alternative names (SANs).
03
Check validity status
The tool shows whether the certificate is valid, expired, or expiring soon so you can renew before it causes downtime.

When you'd check a certificate

Certificate expiring in the next 30 days

Browsers start showing warnings when a cert has less than 30 days left. Check now and renew before users see the red padlock.

Just installed a new certificate

After deploying, confirm the cert is live, covers the right domains, and was issued by the CA you expected.

Wildcard cert — does it cover this subdomain?

A *.example.com cert covers one level of subdomain. Check the SANs to confirm api.example.com is covered but not deep.api.example.com.

Users reporting SSL errors

When someone says 'your site isn't secure', check the cert first. It might be expired, self-signed, or missing a SAN for the subdomain they're hitting.

Third-party service due diligence

Before integrating a payment gateway or API, check their cert is valid and issued by a trusted CA.

Compliance audit

Confirm every domain in your organisation has a valid cert. Expired certs on internal tools are a common finding in security reviews.

Frequently asked questions

Free, no account, no limits.

An SSL/TLS certificate encrypts the connection between a browser and a server, and verifies the server's identity. It's what makes https:// work.

Most certificates are valid for 90 days (Let's Encrypt) or 1 year (commercial CAs). Renew before expiry to avoid downtime.

SANs are additional domain names covered by a single certificate. A certificate for example.com might also cover www.example.com and api.example.com.

Browsers show a security warning and block access to the site. This causes immediate traffic loss and user trust issues.

Yes, in any modern mobile browser.

Related network tools

DNS Lookup

Query A, MX, TXT, CNAME, NS records for any domain.

HTTP Headers Checker

Inspect response headers including security and cache settings.

Redirect Checker

Trace HTTP redirect chains with status codes.

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