SSL Checker
Check SSL certificate validity, expiry, grade and security details for any website
Enter a domain to check its SSL certificate
We'll show you certificate details, expiry, grade, and more
Check any website's SSL/TLS certificate — validity, expiry, issuer, security grade, and supported protocols. Set an email alert 30 days before expiry so your site never goes "Not Secure".
What the SSL grade means
| Grade | Meaning |
|---|---|
| A+ | Modern configuration: strong cipher suites, HSTS, TLS 1.3 preferred |
| A | Solid configuration, no known issues |
| B | Works but uses some weaker ciphers or older protocols |
| C | Known weaknesses — upgrade recommended |
| F | Serious vulnerabilities — fix immediately |
What an expired SSL means
When an SSL certificate expires, browsers display a prominent "Your connection is not private" warning. Users either leave or have to click through warnings to visit your site. Search rankings drop, checkout abandonment spikes, and integrations (Stripe, APIs, webhooks) start failing.
Frequently asked questions
What is an SSL grade?
A letter grade (A+, A, B, C, F) showing overall SSL configuration quality — protocol versions, cipher strength, and certificate validity.
Can I check any website?
Yes, any public-facing HTTPS website can be checked.
What happens if SSL expires?
Browsers show a "Not Secure" warning. Users leave, rankings drop, and API integrations fail.
Can I get alerts before expiry?
Yes — enter your email to get an alert 30 days before expiry.