SSL Certificate Checker
Instantly verify any domain's SSL certificate — expiry countdown, security grade, HSTS, and more. Faster than SSL Labs. More detail than SSL Shopper.
Tip: samsung.com and www.samsung.com may have different certificates — check both.
WHAT WE CHECK
Six checks. One second.
Every check runs live against the target domain — no caching, no estimation.
Certificate Validity
A live HTTPS connection attempt confirms the certificate is active and trusted by major browsers.
Expiry Countdown
Days remaining until expiry. Green above 60 days, yellow above 14, red below — so you know when to act.
Issuer & Domain Coverage
Who issued the certificate and every domain it protects. Wildcard certificates (*.domain.com) are detected automatically.
HSTS Configuration
Checks for the Strict-Transport-Security header, max-age duration, includeSubdomains, and HSTS preload list status.
HTTP → HTTPS Redirect
Verifies that plain HTTP requests automatically redirect to HTTPS — a basic but frequently missed security step.
Security Grade A+ to F
A composite score combining validity, expiry, HSTS, and redirect. A+ means your SSL setup is fully hardened.
COMMON QUESTIONS