SSL Certificate Checker
免費線上 SSL 憑證檢查工具，免安裝。驗證網站憑證有效期和安全性
What is SSL Certificate Checker?
SSL Certificate Checker verifies whether a website's security certificate is valid, expiring soon, and displays issuer information. SSL/TLS certificates are the foundation of HTTPS website security, encrypting communication between browsers and servers to prevent data eavesdropping or tampering.
How to Use
Enter the domain to check (e.g., example.com) and click the "Check" button. The tool queries the domain's SSL certificate information, including validity period, issuer, subject, etc. If the certificate is expiring soon (less than 30 days remaining), it displays in warning colors.
Understanding Results
Status: Shows whether the certificate is valid. Days Remaining: Days until certificate expiration, negative means expired. Issuer: Certificate Authority (CA) that issued the certificate. Valid From/To: The validity period of the certificate.
▶Why does checking take time?
▶Is the check accurate?
▶Can I check internal or local domains?
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