SSL Checker

Check SSL certificates by domain for issuer, expiry date, chain validity, and days remaining with security warnings to prevent outages and errors offline.

SSL Checker

Check HTTPS certificate grade, issuer and expiry via SSL Labs (proxied through api.allorigins.win) with a browser fallback. Ideal for quickly verifying if a site serves valid HTTPS.

Website URL or hostname

Host: example.com

Enter a URL above and click Check SSL to query SSL Labs (via api.allorigins.win proxy) for grade, issuer and expiry. If the API is rate-limited or the host is internal, the browser fallback will explain how to inspect the certificate via the padlock icon.

Privacy & accuracyThis tool proxies requests through allorigins.win to avoid CORS; no certificate data is stored. SSL Labs grades reflect Mozilla / Qualys best practices and may lag by up to 24h when using fromCaches=on. For production monitoring, schedule regular checks or use your CA dashboard.

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About the author

Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: September 9, 2026.

Frequently asked questions

Grade, issuer, subject, notBefore/notAfter, SANs and days until expiry.

Yes, but uses SSL Labs via allorigins proxy; no cert data stored.

Yes, all processing happens locally in your browser and nothing is uploaded.

How to use SSL Checker

Enter host: Enter domain like example.com.
Check: Click Check SSL.
View: See grade, issuer and expiry.

SSL Checker

SSL Checker

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About the author

Frequently asked questions

What does it check?

Is it private?

Is my data private?

How to use SSL Checker