Verify SSL/TLS certificates, check expiration dates, and ensure your website's HTTPS security
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables an encrypted connection between a web server and a browser. SSL certificates are essential for protecting sensitive information and building trust with your visitors.
SSL certificates are crucial for modern websites because they:
Domain Validation (DV): Basic validation confirming domain ownership. Quick and affordable, ideal for blogs and small websites.
Organization Validation (OV): Validates the organization's identity. Suitable for business websites requiring moderate trust levels.
Extended Validation (EV): Highest level of validation with thorough background checks. Displays company name in the browser address bar, ideal for e-commerce and financial sites.
Wildcard SSL: Secures a domain and all its subdomains with a single certificate (e.g., *.example.com).
Multi-Domain SSL (SAN): Secures multiple different domains with one certificate.
TLS (Transport Layer Security) is the successor to SSL and is more secure. While SSL versions (2.0 and 3.0) are deprecated, TLS (1.2 and 1.3) are the current standards. However, the term "SSL certificate" is still commonly used to refer to both SSL and TLS certificates.
Our free SSL checker tool helps you:
Check SSL certificate validity and security status in seconds
View certificate expiration dates and remaining validity days
Get complete certificate details including issuer and SANs
An SSL (Secure Sockets Layer) certificate is a digital certificate that authenticates a website's identity and enables encrypted connection between a web server and browser. It ensures data transmitted remains private and secure, protecting sensitive information from interception.
Simply enter the domain name in our SSL checker tool above and click "Check SSL". We'll verify the certificate, show expiration dates, issuer information, and confirm if HTTPS is properly configured. You can also look for the padlock icon in your browser's address bar.
If your SSL certificate expires, browsers will display security warnings to visitors, potentially blocking access to your site. This can damage trust, hurt conversions, and negatively impact SEO rankings. Most certificates need renewal every 90 days (Let's Encrypt) to 1 year (commercial CAs).
TLS (Transport Layer Security) is the successor to SSL and is more secure. SSL 2.0 and 3.0 are deprecated due to security vulnerabilities. Modern websites use TLS 1.2 or 1.3, though the term "SSL certificate" is still commonly used to refer to both SSL and TLS certificates.
Check your SSL certificate at least monthly, especially 30 days before expiration. Set up automated monitoring or auto-renewal through your certificate provider to prevent unexpected expiration that could disrupt your website and damage user trust.
The "Not Secure" warning appears when a website doesn't have a valid SSL certificate or uses HTTP instead of HTTPS. This alerts visitors that their data could be intercepted. Install an SSL certificate and enable HTTPS to remove this warning.
Yes, Let's Encrypt provides free SSL certificates that are trusted by all major browsers. Many web hosting providers offer free SSL certificates through Let's Encrypt or their own certificate authorities. These are suitable for most websites.
Subject Alternative Names (SAN) are additional domains or subdomains secured by a single SSL certificate. For example, a SAN certificate can secure www.example.com, example.com, and mail.example.com with one certificate.
Common fixes include: renewing expired certificates, ensuring the certificate matches your domain name, installing intermediate certificates, updating to TLS 1.2+, fixing mixed content issues, and verifying proper certificate installation on your server.
Modern SSL/TLS implementations have minimal performance impact. In fact, HTTPS can improve performance through HTTP/2 support, which is only available over secure connections. The security and SEO benefits far outweigh any negligible performance overhead.