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HTTPS / SSL Checker

Test if a site loads over HTTPS, check DNS records, and see HSTS preload status.

Hostname or URL

HTTPS reachability probe

Reachable–

Round-trip–

Probes attempt to load an image from the HTTPS site. A network or timeout error means the site is unreachable or blocking cross-origin requests.

DNS records (DNS-over-HTTPS via Google)

A records–

CAA records–

HTTPS/SVCB–

DNS queries performed via Google's DNS-over-HTTPS API (CORS-enabled). Shows A, CAA (issuers) and HTTPS/SVCB records.

Manual verification checklist

Due to browser sandbox restrictions, this page cannot perform a TLS handshake or inspect certificate details. Use these links to verify manually:

Check TLS 1.2+ supportSSL Labs test
Verify certificate validityCheck certificate
HSTS preload statusHSTS preload list
HSTS header presentView headers

Browser limitation: This page runs entirely in your browser. Due to CORS and the Same-Origin Policy, we cannot inspect the actual TLS handshake or certificate details, that requires server-side access. We can only test reachability via probes and query public DNS APIs.

Test a site's HTTPS setup

HTTPS encrypts traffic between a browser and a site, and a healthy certificate and configuration are what make that trust real. This tester checks a site's HTTPS — whether the certificate is valid and current and the connection is secure — which is useful when launching a site or diagnosing a browser security warning.

How to use it

Enter the site's address.
Run the test.
Review the certificate and connection findings.

What to check

The certificate is valid and not expired.
It's issued for the correct domain.
The connection uses modern, secure settings.

Questions people ask

Why does my browser warn about a valid-looking site? Common causes are an expired certificate, a name mismatch, or an incomplete certificate chain — the test helps pinpoint which.

Does testing change my site? No — it only inspects the publicly visible configuration.