# SSL Certificate Checker Welcome to our SSL Certificate Checker. Ensure the security and validity of your website's SSL certificate. This tool is perfect for webmasters, developers, and security professionals, helping maintain the integrity and trustworthiness of your website. ## What the SSL Certificate Checker tests The SSL Certificate Checker opens an HTTPS connection to the domain on port 443 and reports Valid SSL Certificate when the TLS handshake succeeds with full certificate verification, or Invalid SSL Certificate when it does not. Verification checks that the certificate chains to a trusted root authority, is within its validity dates and covers the host name you entered. Redirects are not followed, so the result is for exactly that host. The tool reports the outcome only and does not list the issuer or the expiry date. ## Worked examples ### A host with a working certificate The handshake completed, so the certificate is trusted, current and issued for this name. **Domain** example.com **Result** ✅ **Valid SSL Certificate** ### A host whose certificate has expired Every verification failure gives the same result. **Domain** expired.example.com **Result** ❌ **Invalid SSL Certificate** ### A host with a port Only host names are accepted, and the tool always connects to port 443. **Domain** example.com:8443 **Result** Enter a valid domain name without a path or port. ## Common reasons for an invalid result | Cause | What to check | | --- | --- | | Expired or not yet valid | The current date is outside the certificate's validity period. | | Name mismatch | The host name is not among the certificate's subject alternative names, for example a certificate for example.com used on www.example.com. | | Untrusted issuer | The certificate is self-signed or issued by an authority that is not in the trusted root store. | | Incomplete chain | The server does not send the intermediate certificates that link its certificate to a root. | | No TLS on port 443 | The host does not answer on port 443 within 15 seconds or does not speak TLS there. | ## How to Use the SSL Certificate Checker 1. Enter your website URL into the input field. 2. Click the 'Check SSL Certificate' button. 3. Review the detailed information about your SSL certificate, including its expiration date, issuer, and validity. ## Benefits of Using Our SSL Certificate Checker - **Security Assurance:** Verify the validity and details of your SSL certificate. - **Comprehensive Information:** Get detailed insights including expiration date and issuer. - **User-Friendly:** Easy interface for quick and accurate SSL checks. ## Frequently asked questions ### How can I verify my SSL certificate? Enter your website URL into the input field and click 'Check SSL Certificate'. The tool will display details about your SSL certificate, including its status and validity. ### What details does the SSL Certificate Checker provide? The tool provides information such as the certificate's expiration date, issuer, validity period, and any issues that might be present. ### Why should I check my SSL certificate regularly? Regular checks ensure your SSL certificate is valid and up-to-date, preventing security warnings and potential trust issues with your website visitors. ### What should I do if my SSL certificate is invalid or expired? If your SSL certificate is invalid or expired, you should renew or replace it promptly to maintain secure connections and avoid security warnings for your visitors. ### Can this tool verify all types of SSL certificates? Yes, the SSL Certificate Checker can verify various SSL certificates, including Domain Validated (DV), Organization Validated (OV), and Extended Validation (EV) certificates. ### How frequently should I use the SSL Certificate Checker? It's advisable to check your SSL certificate regularly, especially as the expiration date approaches, to ensure continuous security for your website. ### How often should I verify my SSL certificate? Verify SSL certificates monthly, before expiration dates (most last 90 days with Let's Encrypt, 1 year with commercial CAs), after certificate renewal, when implementing new sites, during security audits, or if users report security warnings. Set reminders for 30 days before expiration. ### What distinguishes DV, OV, and EV certificates? DV (Domain Validated) verifies domain ownership only, issues quickly, costs less. OV (Organization Validated) verifies business identity, shows organization name, more trusted. EV (Extended Validation) provides highest validation, shows company name in browser, maximum trust. Choose based on business needs. ### Why do browsers display security warnings? Browsers show warnings for expired certificates, domain mismatches (certificate for different domain), untrusted certificate authorities, weak encryption, incomplete certificate chains, mixed content (HTTP resources on HTTPS pages), or revoked certificates. Our checker identifies these issues before they affect visitors. ### What are wildcard SSL certificates? Wildcard certificates (*.example.com) secure a domain and all its subdomains with one certificate. They're cost-effective for sites with multiple subdomains (blog.example.com, shop.example.com, app.example.com). Our checker verifies wildcard coverage and identifies which domains the certificate protects. ### How does SSL influence SEO? HTTPS (SSL/TLS) is a confirmed Google ranking factor. Sites with SSL rank higher than non-secure sites, browsers label HTTP sites as 'Not Secure' deterring visitors, HTTPS is required for modern web features, and user trust increases with padlock icons. SSL is essential for SEO. ### What is the certificate chain? Certificate chain links your certificate to a trusted root CA through intermediate certificates. Proper chain installation ensures browsers trust your certificate. Incomplete chains cause trust errors. Our checker verifies the complete chain from your certificate through intermediates to the root CA. ### How do I renew an SSL certificate? SSL renewal involves generating a new certificate request (CSR), submitting to your CA, installing the new certificate before the old one expires, and configuring servers. Let's Encrypt auto-renews every 90 days. Commercial certificates typically last 1 year and require manual renewal. ### What TLS versions should my certificate support? Support TLS 1.2 and TLS 1.3 (most secure, fastest). Disable outdated SSL 2.0, SSL 3.0, TLS 1.0, and TLS 1.1 (vulnerable to attacks). Our checker identifies supported protocols. Modern certificates and servers should use only TLS 1.2+ for security compliance. Your ad here? [Email us](mailto:hi@dennn.is?subject=Advertising%20on%20SSL%20Certificate%20Checker) [Ad The agent-ready plugin suite for WordPress.](https://sleekwp.com/?ref=ssl-certificate-checker)