Free SSL Certificate & Domain Checker
Check your TLS/SSL certificate health, chain validity, expiry dates, and domain WHOIS registration instantly. No account required.
Why Online SSL Certificate Checking is Critical
Modern web browsers strictly enforce HTTPS encryption. When an SSL/TLS certificate expires, fails hostname verification, or suffers from a broken intermediate CA chain, browsers display severe warning screens (e.g. "Your connection is not private" / NET::ERR_CERT_DATE_INVALID). This immediately blocks web traffic, triggers SEO ranking demotions, and destroys user trust.
Verify Intermediate Chains
Ensure root and intermediate certificates are properly bundled so desktop and mobile browsers don't throw untrusted issuer alerts.
Track Auto-Renewal Failures
Certbot and Let's Encrypt renewal hooks can silently fail due to rate limits, DNS changes, or Nginx configuration errors.
Combine SSL + Domain RDAP
An active SSL certificate is useless if your registrar domain registration lapses. ExpiryHawk monitors both simultaneously.
Frequently Asked Questions
How frequently should I check my SSL certificate?
Manual checking once a month is prone to human error. Best practice is automated bi-daily or daily continuous monitoring. ExpiryHawk checks certificates twice daily and alerts you 30, 14, 7, and 1 day before expiration.
What causes the "SSL Certificate Expired" error?
SSL certificates have a fixed validity lifespan (typically 90 days for Let's Encrypt or 398 days for commercial CAs). If automated renewal cron jobs fail or payment methods expire, the certificate ceases to be trusted by browsers.
Does this tool inspect Subject Alternative Names (SANs)?
Yes, ExpiryHawk decodes the full X.509 certificate payload including Common Name, SANs, serial numbers, public key algorithms, and OCSP stapling status.