Free SSL Checker Tool
Free SSL checker tool. Verify if any website has a valid SSL certificate, check expiry date, issuer, and HTTPS configuration. No signup, instant results.
What is an SSL checker?
An SSL (Secure Sockets Layer) certificate — more accurately called a TLS certificate today — is a digital certificate that authenticates a website's identity and enables encrypted connections. When a website has a valid SSL certificate, browsers show a padlock icon and use HTTPS instead of HTTP. Without it, browsers display a "Not Secure" warning that drives users away.
Why check SSL certificate expiry?
SSL certificates expire — typically after 90 days (Let's Encrypt) or 1-2 years (commercial CAs). An expired certificate causes browsers to block access to your site with a full-page warning, immediately destroying user trust. Developers and site owners should monitor certificate expiry proactively. This tool tells you exactly how many days remain before expiry.
What does this SSL checker verify?
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What happens when an SSL certificate expires?
When an SSL certificate expires, browsers display a security warning — "Your connection is not private" (Chrome) or "Warning: Potential Security Risk Ahead" (Firefox) — and users must manually override to proceed. This dramatically reduces trust and traffic. Search engines may also demote sites with expired certificates.
Set a calendar reminder at least 30 days before your certificate expires. Most certificate authorities send expiry reminder emails, but these are easily missed. Let's Encrypt certificates expire every 90 days and should be configured to auto-renew using Certbot or your hosting provider's built-in renewal tools.
What is the difference between DV, OV, and EV SSL certificates?
DV (Domain Validated) certificates verify only that you control the domain. They are issued in minutes, free via Let's Encrypt, and sufficient for most websites. OV (Organization Validated) certificates verify the organization behind the domain, requiring manual vetting — used by businesses that want to show legitimacy. EV (Extended Validation) certificates require the most rigorous vetting and previously showed a green address bar, though modern browsers have removed this visual distinction.
For most developer tools, personal projects, and small businesses, a free Let's Encrypt DV certificate is the correct choice. EV certificates cost hundreds of dollars annually and provide minimal visible benefit to end users today.