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SSL Certificate Checker

Verify SSL/TLS certificate validity, expiry date, issuer, and encryption details for any domain.

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Why SSL Certificates Matter

SSL/TLS certificates encrypt the connection between your visitors' browsers and your server, protecting sensitive data like login credentials, payment information, and personal details from interception. Since 2014, Google has used HTTPS as a ranking signal, and since 2018, Chrome marks all HTTP pages as 'Not Secure'. An expired or misconfigured certificate triggers browser warnings that immediately destroy user trust and send visitors away.

What Is an SSL Certificate?

An SSL (Secure Sockets Layer) certificate is a digital document that binds a cryptographic key to your domain. When a browser connects to your site, the certificate proves your identity and enables encrypted communication via TLS (Transport Layer Security). Certificates are issued by Certificate Authorities (CAs) like Let's Encrypt, DigiCert, and Comodo after verifying domain ownership.

Why Certificate Expiry Monitoring Matters

SSL certificates have a maximum validity of 398 days (about 13 months). When a certificate expires, browsers display full-page security warnings that block access to your site. Automated renewal via ACME (the protocol behind Let's Encrypt) has reduced this risk, but misconfigurations, DNS changes, and hosting migrations can silently break auto-renewal. Proactive monitoring catches these problems before your visitors do.

Frequently Asked Questions

What happens when an SSL certificate expires?
Browsers display a full-page security warning that blocks users from reaching your site. Most visitors will leave immediately rather than click through the warning. Search engines may also temporarily drop your pages from results, causing a significant traffic loss until the certificate is renewed.
Are Let's Encrypt certificates as secure as paid ones?
Yes. Let's Encrypt certificates use the same encryption strength (RSA 2048-bit or ECDSA P-256) as paid certificates. The difference is in validation level, not security. Let's Encrypt provides Domain Validation (DV) only, while paid certificates offer Organization Validation (OV) or Extended Validation (EV) that display the company name.
Does SSL affect SEO rankings?
Yes. Google confirmed HTTPS as a ranking signal in 2014. While it is a lightweight signal compared to content quality and backlinks, all else being equal, HTTPS pages rank higher than HTTP equivalents. More importantly, the 'Not Secure' browser warning on HTTP pages dramatically increases bounce rate.
What is mixed content and why is it a problem?
Mixed content occurs when an HTTPS page loads resources (images, scripts, stylesheets) over plain HTTP. This breaks the security chain because those unencrypted resources can be intercepted or modified. Browsers block mixed active content (scripts, iframes) entirely and may warn about mixed passive content (images), causing broken pages and degraded trust.

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