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Free SSL Checker

SSL Certificate Checker

Check your SSL certificate instantly. Verify expiration date, issuer, subject, subject alternative names (SANs), wildcard coverage and supported TLS versions.

ExpirationIssuerSubjectSANsWildcardTLSSignature

Useful for monitoring HTTPS security, troubleshooting certificate issues and ensuring your website is properly secured.

Check Certificate Expiry

Ensure your SSL certificate is valid and not expired.

Verify Issuer & Subject

Inspect certificate authority, ownership and subject details.

Analyze SANs & Wildcards

See which domains and subdomains are covered by the certificate.

Check TLS & Security

Review supported TLS versions and signature algorithms.

What can you check with this SSL tool?

This SSL checker allows you to inspect the most important details of a website?s SSL certificate. You can verify whether a certificate is valid, when it expires, which certificate authority issued it and which domains it covers.

SSL certificates are critical for HTTPS security. Misconfigurations, expired certificates or missing domain coverage can lead to browser warnings and loss of trust. This tool helps you quickly diagnose and validate your SSL setup.

Certificate details you can inspect

Expiration Date

Shows when the SSL certificate expires. An expired certificate will trigger browser security warnings and block HTTPS trust.

Issuer

Indicates the certificate authority (CA) that issued the SSL certificate, such as Let?s Encrypt or DigiCert.

Subject

Displays the primary domain or entity the certificate was issued for. This is typically the main hostname.

SANs (Subject Alternative Names)

Lists all domains and subdomains covered by the certificate, including additional hostnames beyond the primary domain.

Wildcard Coverage

Indicates whether the certificate supports wildcard domains (e.g. *.example.com), allowing protection of multiple subdomains.

Organization Name

Check which organization issued the certificate.

Signature Algorithm

Specifies the cryptographic algorithm used to sign the certificate, such as SHA-256. Strong algorithms are essential for security.

TLS Version

Shows which TLS protocol versions are supported by the server. Modern setups should support TLS 1.2 and TLS 1.3.

When should you use an SSL checker?

  • Before launching a website
  • After installing or renewing an SSL certificate
  • When your browser shows security warnings
  • When HTTPS is not working correctly
  • To verify domain coverage (SANs or wildcards)
  • To monitor certificate expiration
  • To audit TLS and security configuration

Frequently Asked Questions

SSL means Secure Sockets Layer. SSL is a security technology that creates an encrypted link between a web server and a browser, protecting data in transit from being stolen.

TLS (Transport Layer Security) is the modern, secure successor to SSL (Secure Sockets Layer), which is now deprecated due to security vulnerabilities. Both protocols authenticate and encrypt data between web browsers and servers, but TLS offers stronger encryption, faster handshakes, and better security against modern threats. All modern browsers now use TLS.

Yes. Without an SSL certificate, browsers will show a "Not Secure" warning to anyone visiting your site, which will cause most visitors to leave immediately. If you're running any kind of website, from blogs to webshops or a business page, you need one.

This warning appears when your browser cannot establish a secure, encrypted connection with the website. The most common causes are a missing or expired SSL certificate, a certificate that doesn't match the domain name, or an incorrect system clock on your device, which can cause certificate validation to fail even on legitimate sites.

Common causes include an expired certificate, mismatched domain name, missing intermediate certificates or unsupported TLS versions.

Common fixes include renewing an expired certificate, ensuring the domain matches the certificate, installing missing intermediate certificates and enabling modern TLS versions on your server.

The quickest way is to click the padlock icon in your browser's address bar and view the certificate details ? the expiry date will be listed there. You can also use an SSL checker tool, which will clearly flag whether the certificate is still valid. If it has expired, browsers will immediately show a security warning to anyone visiting your site.

The primary difference is that a normal SSL certificate secures a single domain (e.g., example.com and www.example.com), while a Wildcard SSL certificate secures one main domain and an unlimited number of its subdomains (e.g., blog.example.com, mail.example.com) using a single certificate. Wildcard certificates are ideal for managing multiple subdomains, while normal certificates are best for single, standalone websites.

A wildcard certificate secures a domain and all its subdomains under one certificate, such as *.example.com.

Subject Alternative Names (SANs) define which domains and subdomains are covered by the certificate. A single certificate can secure multiple hostnames using SANs.

An SSL certificate chain is the sequence of certificates that links your domain certificate to a trusted root certificate authority. It includes intermediate certificates required for browsers to verify trust.

The issuer is the certificate authority (CA) that verified your domain and issued the SSL certificate. Trusted issuers are recognized by browsers and operating systems.

Your server should support TLS 1.2 and TLS 1.3. Older versions like TLS 1.0 and 1.1 are deprecated and considered insecure.

Enter your domain name into the SSL checker. The tool will connect to your server and display key details such as the expiration date, issuer, covered domains (SANs), and TLS configuration, helping you spot any issues before they affect your visitors.

When you enter a domain, the tool makes a secure connection to your server and inspects the SSL certificate it presents. It checks details like the expiry date, issuer, domain coverage, and TLS version support, giving you a clear picture of your site's security configuration.

It's good practice to check your certificate at least once a month, and more frequently as the expiry date approaches. This is especially important since many modern certificates, including free ones from providers like Let's Encrypt, expire every 90 days. Missing a renewal can take your site offline or trigger browser warnings for all your visitors.

Yes, this SSL checker is completely free and allows you to inspect certificate details instantly.
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