SSL Certificate Checker
Confirm a site's HTTPS is live and learn to inspect its SSL certificate. Free checker with DNS resolution plus links to trusted SSL analysis tools.
About the SSL Certificate Checker
An SSL/TLS certificate proves a site's identity and encrypts traffic between the browser and server. This tool confirms a domain resolves and is reachable, and gives you a fast, honest path to the full certificate details — issuer, validity dates, chain and expiry — using trusted analysis services.
Reading a live certificate requires opening a raw TLS connection to the server on port 443 and inspecting the handshake, which browsers deliberately forbid from client-side JavaScript. Rather than pretend otherwise, this tool resolves the domain's DNS in your browser to confirm it is live, then links you to reputable checkers like SSL Labs and Qualys that perform the deep certificate and protocol analysis for free.
Use it to quickly verify a site is set up for HTTPS and to jump straight to a complete grade of its TLS configuration — cipher strength, protocol support, chain trust and days until expiry.
How to Use the SSL Certificate Checker
- 1Enter the domain you want to inspect.
- 2Review the DNS resolution confirming the site is live.
- 3Open one of the linked SSL analysis tools for the full certificate report.
- 4Check the issuer, expiry date and configuration grade there.
Frequently Asked Questions
Why can't this tool read the SSL certificate directly?
Inspecting a certificate means opening a raw TLS socket to the server and reading the handshake, something browsers block JavaScript from doing for security reasons. A free client-side tool cannot access it without a paid server backend. We instead confirm the domain is live via DNS and link you to trusted services that perform the full inspection.
How do I check when an SSL certificate expires?
Open the linked SSL Labs or a WHOIS/SSL checker and enter the domain — the report lists the certificate's 'Valid until' date. In your own browser you can also click the padlock in the address bar, view the certificate, and read its expiry under the details tab.
What happens when an SSL certificate expires?
Browsers show a full-page security warning ('Your connection is not private') and block or discourage access, which destroys trust and traffic. Certificates from Let's Encrypt last 90 days and commercial ones up to about a year, so set up auto-renewal to avoid an outage.
What makes a good TLS configuration?
A strong setup uses TLS 1.2 and 1.3, disables old protocols like SSL 3.0 and TLS 1.0, serves the full certificate chain, uses modern ciphers, and enables HSTS. The linked SSL Labs test grades all of this and gives an overall A–F score.
Is a free SSL certificate as secure as a paid one?
Yes for encryption. A free Let's Encrypt certificate uses the same strong encryption as a paid one; the difference is validation level and warranty. Paid Organization or Extended Validation certificates verify your business identity, but for encrypting a standard website a free certificate is fully secure.