How do I use the SSL Certificate Checker?

Enter a domain name and run the check to attempt an HTTPS fetch from the browser first. Review whether HTTPS was reachable, whether the response was fully readable or opaque, and whether a visible HTTP redirect could be confirmed. Check the HSTS and other security header rows to see which values were exposed to JavaScript on the response. Use the checklist to understand the difference between a pass, a warning caused by browser limitations, and a hard failure. Open the linked third-party certificate tools when you need issuer, expiry, SAN, chain, or deeper TLS inspection beyond what browsers expose client-side.

Is the SSL Certificate Checker free?

Yes, the SSL Certificate Checker is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

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security

SSL Certificate Checker

Test browser-visible HTTPS reachability, redirect behavior, and exposed security headers with clear client-side limitations.

ssl certificate checkerssl checkerhttps checkercertificate check

Browser-based HTTPS probe

Check HTTPS reachability and exposed security headers

Browsers cannot read raw certificate details directly, so this tool tests whether HTTPS loads, whether redirects are visible, and whether common response headers are exposed to client-side JavaScript.

Domain name

Enter a domain name to test browser-visible HTTPS signals.

Limitation: the browser cannot inspect certificate issuer, SANs, expiry, or full TLS details from client-side code alone. Use the external links on the right for complete certificate inspection.

Domain

—

HTTPS result

Waiting

HTTP redirect

Unknown

HSTS header

Unknown

Security checklist

Pass, warning, or fail

Readable security headers

Only exposed headers appear

Full certificate tools

Open SSL Labs certificate test Open SecurityHeaders.com Open Why No Padlock

How to use

How to test browser-visible HTTPS reachability and exposed security headers with an SSL checker

1 Enter a domain name and run the check to attempt an HTTPS fetch from the browser first.
2 Review whether HTTPS was reachable, whether the response was fully readable or opaque, and whether a visible HTTP redirect could be confirmed.
3 Check the HSTS and other security header rows to see which values were exposed to JavaScript on the response.
4 Use the checklist to understand the difference between a pass, a warning caused by browser limitations, and a hard failure.
5 Open the linked third-party certificate tools when you need issuer, expiry, SAN, chain, or deeper TLS inspection beyond what browsers expose client-side.

Client-side SSL checks are inherently limited because browser JavaScript cannot directly inspect a site's TLS certificate details the way a server-side scanner can. Even so, a browser probe is still useful for answering practical questions such as whether the HTTPS endpoint loads at all, whether redirects are visible, and whether important headers like Strict-Transport-Security are exposed.

That combination makes the tool a quick first-pass diagnostic for front-end teams, SEO reviews, and site QA. When the browser can only see an opaque response, the limitation itself is informative because it shows the boundary between browser-visible security signals and deeper certificate data that requires a dedicated external scanner.

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