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Free SSL Certificate Checker

A shared IP hosting several domains can present a different certificate depending on which hostname is requested, so checking the wrong way can show the wrong cert. Verify expiry, issuer, domain coverage, and TLS strength by domain name, in one click.

🔒 Check Your SSL Certificate
Enter your website URL or domain name and we'll connect to port 443 using proper SNI, then run a full SSL certificate audit: validity, expiry, issuer trust, domain coverage, chain completeness, and TLS version.
Checks port 443. You can enter a full URL, a domain, or a subdomain.

Free, instant, no account needed.

Connecting to your server and reading the SSL certificate...
This usually takes 3 to 8 seconds.

The Certificate You Check Might Not Be the Certificate Your Visitors Get

Most servers host more than one domain on a single IP address, using SNI to decide which certificate to hand back based on the hostname requested during the TLS handshake. Check the bare IP address, or use an older client that skips SNI, and the server can return its default certificate instead, possibly for an unrelated domain or one that's already expired, even while the actual domain's certificate is fine.

That distinction matters because it's easy to "verify" the wrong thing and walk away reassured. The fix is simple once you know to look for it: always check by hostname, never by raw IP, and confirm the tool doing the checking actually sends SNI.

Why an Expired Certificate Is Both an SEO and Security Problem

An SSL certificate is more than a green padlock; it's a trust signal and a ranking input. When it expires, browsers block access with a high-risk warning that does real damage in seconds.

What Gets Checked Beyond the Expiry Date

A deeper look at the security layer, with proper SNI handling so the right certificate gets evaluated.

How to Fix SSL Certificate Issues

SSL problems range from a one-click renewal to a complex server reconfiguration. Here's how to handle each scenario.

1
Expired certificate: renew or replace it immediately

Every visitor is seeing a full-page browser warning right now. Log in to the hosting panel or CA dashboard for an immediate renewal: AutoSSL for cPanel, certbot renew --force-renewal for Let's Encrypt. Restart the web server afterward and re-run this tool to confirm.

2
The certificate shown doesn't match what you expected

If a checker returns an unrelated or expired certificate, confirm it actually connected using SNI with the correct hostname rather than the bare IP. A shared IP serving multiple domains hands back a default certificate to any client that doesn't specify the hostname properly, which can look like a real problem when it isn't one.

3
Certificate expiring soon: start the renewal now, not on the deadline

DNS propagation and domain validation take hours, so renew at least 30 days out. Most CAs let early renewal start from the current expiry date rather than the renewal date, so nothing's lost. Automate it with a cron job or Certbot's timer for Let's Encrypt's 90-day certs.

4
Certificate chain error: install the intermediate certificates

A missing intermediate causes errors on Android and corporate networks even when the leaf certificate is valid. Download the full-chain bundle from the CA and point the server at it instead of just the leaf file.

5
Weak TLS protocol: disable TLS 1.0 and 1.1

Both are deprecated and vulnerable to known attacks. Restrict the server to TLS 1.2/1.3 only, then verify at SSL Labs for at least an A rating.

Manual Tracking Doesn't Scale Past One Domain

Across multiple domains or subdomains with SNI in the mix, tracking SSL dates by hand is fragile, and a forgotten renewal tends to surface on a Friday evening when nobody's watching.

What Continuous Monitoring Adds

Keep Your Connection Secure and Your Rankings Stable

Don't wait for a browser warning to take action. Keep encryption current and verified by the right hostname, every time.

Start Your 1-Month Free Trial Now
FAQ

SSL Certificate Questions Answered

Everything you need to know about SSL certificates, expiry dates, and browser security.

Most servers host multiple domains on one shared IP using SNI, which decides the certificate to present based on the hostname sent during the handshake. Checking the bare IP, or using a client that skips SNI, can return a default or unrelated certificate even though the actual domain's certificate is perfectly valid when requested by name.

Every major browser blocks access with a full-page warning. Most users leave instantly, Google's crawler may stop indexing the pages, and traffic reverts to unencrypted, exposing anything submitted.

TLS 1.3 cuts the handshake to one round trip, improving load speed, drops weak legacy ciphers, and makes forward secrecy mandatory. TLS 1.2 is still acceptable, but 1.3 should be enabled wherever possible.

The sequence of certificates linking a leaf certificate back to a trusted root CA. If the intermediate is missing from the server config, some browsers, especially Android and older iOS, reject the certificate even though the root is trusted.

At least 30 days before expiry. Most CAs let early renewal start from the current expiry date rather than the renewal date, so no paid time is lost. Let's Encrypt users typically automate renewal around the 60-day mark of a 90-day cert.

Yes. Free certificates from Let's Encrypt are cryptographically identical to paid DV certificates and trusted by every major browser. The practical differences are renewal cadence (90 days vs. 1-2 years) and the lack of OV/EV identity validation, which only matters for sites wanting to display company identity in the browser.

A header telling browsers to always connect over HTTPS, never HTTP, for a set duration. It closes the window where a first unencrypted request could get intercepted and guards against downgrade attacks. Test thoroughly before setting a long max-age, since removing HSTS afterward is difficult once browsers have cached it.