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About SSL Certificate Checker
Free online SSL/TLS certificate checker tool. Enter a domain to quickly inspect SSL certificate details including issuer, validity period, Subject Alternative Names (SAN), signature algorithm, public key info, TLS protocol version, and more. Helps you detect expired certificates and misconfigurations.
SSL CheckerCertificate CheckNetwork SecurityHTTPSSSL/TLS
User Guide
Key Features
- Free online SSL/TLS certificate checker tool
- Enter a domain to quickly inspect SSL certificate details including issuer, validity period, Subject Alternative Names (SAN), signature algorithm, public key info, TLS protocol version, and more
How to Use
- Open the tool page — no installation needed
- Enter a domain in the input box (an http:// or https:// prefix is optional)
- Click "Check" to view the certificate details — or use "Load Example" to try it instantly, and "Copy" to save the result
Important Notes
- This tool is completely free and requires no sign-up
- Everything runs locally in your browser — your data never leaves your device
Frequently Asked Questions
What is SSL Certificate Checker?
Free online SSL/TLS certificate checker tool. Enter a domain to quickly inspect SSL certificate details including issuer, validity period, Subject Alternative Names (SAN), signature algorithm, public key info, TLS protocol version, and more. Helps you detect expired certificates and misconfigurations.
How do I use SSL Certificate Checker?
Open the tool page — no installation needed Enter a domain in the input box (an http:// or https:// prefix is optional) Click "Check" to view the certificate details — or use "Load Example" to try it instantly, and "Copy" to save the result
What should I know before using SSL Certificate Checker?
This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device
Is SSL Certificate Checker free to use?
Yes, SSL Certificate Checker is completely free. No download or installation required — it runs right in your browser.