Is this SSL checker really free?

Yes — check any domain, no account, no payment.

What does the SSL checker test?

Certificate validity dates, the issuing CA, whether the hostname matches the domain, and whether the certificate chain is complete — the four things behind nearly every browser warning.

My certificate is valid but browsers still warn — why?

The usual suspects: an incomplete chain (missing intermediate certificate), a hostname mismatch (www vs. bare domain not covered), or mixed content on the page. The report flags the first two directly.

How often should I check expiry?

After every renewal, plus a scheduled check well before expiry — monthly for 90-day certificates. Automated renewal is great until it silently breaks; the checker is your backstop.

Do I need to re-check after renewing?

Yes — surprisingly often, the renewed certificate isn't the one being served (stale server config, CDN caching the old cert). Verify the live certificate, not the renewal confirmation email.

What's the difference between DV, OV, and EV certificates?

The validation depth before issuance: Domain Validation (prove you control the domain), Organization Validation (prove the company exists), Extended Validation (deeper vetting). Browsers no longer display any visual difference, so for most sites DV — including free Let's Encrypt — is functionally identical to paid options.

Does a free Let's Encrypt certificate work the same as a paid one?

For encryption and browser trust, yes. Paid certificates add longer validity periods, warranties, and support — not stronger encryption. Most sites are perfectly served by free certificates with working auto-renewal.

Can a phishing site have a valid certificate?

Absolutely — and most do. Certificates are free and automated now. A valid certificate proves the connection is encrypted to that domain; it says nothing about whether the domain's owner is honest. Pair certificate checks with domain research — the Whois Checker shows when a suspicious domain was actually registered.

SSL Checker

Check any site's SSL certificate: validity and expiry.

Fetched once, processed in memory — nothing is stored. How we handle your data →

Fetched once, processed in memory — nothing is stored.

Your results will appear here.

Fill in the input above and run the tool to get started.

Honest limits

This checks the certificate, not site safety — phishing sites have valid certificates too.

How to use the SSL Checker

Enter a domain name and press Check SSL.
The big number is the honest headline: days until the certificate expires.
Review the issuer, TLS version and chain — then set a renewal reminder.

Examples

Example

Check example.com → expiry countdown, issuer organization, TLS version, the full certificate chain and all subject alternative names.

What this tool doesn't do

Quick check only — for deep analysis (cipher suites, vulnerabilities) use Qualys SSL Labs.
We check the certificate on port 443; some services terminate TLS elsewhere (CDN, load balancer).
No letter grades — a certificate is either valid for your domain or it isn't.

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Frequently asked questions

Is this SSL checker really free? +

What does the SSL checker test? +

My certificate is valid but browsers still warn — why? +

How often should I check expiry? +

Do I need to re-check after renewing? +

What's the difference between DV, OV, and EV certificates? +

Does a free Let's Encrypt certificate work the same as a paid one? +

Can a phishing site have a valid certificate? +

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