SSL Checker – Check SSL Certificate Details Online
Free SSL checker. See SSL/TLS certificate issuer, validity dates, expiry and domain coverage for any website to make sure HTTPS is secure and not expiring soon.
SSL Lookup – Free Online Tool
Our free SSL Lookup tool checks the SSL/TLS certificate of any website and shows who issued it, which domains it covers and exactly when it expires. Use it to catch expired or misconfigured certificates before your visitors see a browser security warning.
What is SSL Lookup?
An SSL (more accurately TLS) certificate encrypts the connection between a browser and a website and proves the site is who it claims to be. It is what turns http:// into https:// and shows the padlock in the address bar.
Certificates expire — free ones such as Let’s Encrypt every 90 days — and an expired certificate makes browsers block visitors with a full-page warning, which also hurts your Google rankings and trust.
How to use the SSL Lookup
- Enter the domain name, for example www.example.com.
- Click submit to fetch the live certificate.
- Check the issuer, the valid from and valid to dates, and the list of covered domain names.
- If the expiry date is close, renew the certificate or check that auto-renewal is working.
Key features
- Shows issuer, subject and certificate authority
- Displays exact validity and expiry dates
- Lists all domains (SAN) covered by the certificate
- Free and instant with no installation
Common use cases
- Verifying a new SSL installation works correctly
- Monitoring expiry dates for client or company websites
- Checking that both www and non-www versions are covered
- Diagnosing “Your connection is not private” browser errors
Frequently asked questions
Does HTTPS help SEO?
Yes. Google uses HTTPS as a ranking signal, and browsers label non-HTTPS pages as “Not secure”, which reduces clicks and trust.
What happens when an SSL certificate expires?
Browsers show a security warning and most visitors leave. Renew before the expiry date or enable automatic renewal with your host.
Is a free SSL certificate good enough?
For most websites, yes. Free certificates such as Let’s Encrypt provide the same encryption strength as paid domain-validated certificates.
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