Instantly check your website's SSL certificate for errors, expiration, and security. Our free SSL Checker validates issuer, validity period, and certificate chain to ensure your site is secure and trusted. No installation required.

Free SSL Checker Tool

Ensure your website's security and trustworthiness in seconds. An invalid, expired, or misconfigured SSL certificate triggers browser security warnings, scares away visitors, and harms your SEO. Use our free SSL Checker to perform a deep analysis of your SSL/TLS certificate, verifying its validity, issuer, expiration date, and more. Protect your site's reputation and your users' data with a single click.

How to Use the A10ROG SSL Checker

1. Enter Your Domain: Type your website URL into the input field (e.g., yourdomain.com). There's no need to include https://.
2. Click "Check SSL": Initiate our comprehensive SSL scan.
3. Review Your Results: Get a detailed, easy-to-understand report on your certificate's health and status.
4. Understand & Act: Use the information below to interpret your results and fix any issues.

What Our SSL Checker Analyzes

Our tool performs a complete SSL health audit, providing you with critical information:

Certificate Validity & Expiration

• Checks: The certificate's start date, end date, and remaining validity.
• Why it Matters: An expired SSL certificate will display a critical security error in all major browsers, causing visitors to immediately leave your site.

Certificate Authority & Issuer

• Checks: Which trusted Certificate Authority (CA) issued the SSL (e.g., Let's Encrypt, DigiCert, Comodo).
• Why it Matters: Verifies that a reputable entity issued your certificate, ensuring broad browser compatibility and trust.

Certificate Chain & Trust

• Checks: The complete chain of trust from your server certificate to the root CA.
• Why it Matters: A broken certificate chain is a common cause of "certificate not trusted" errors, even if your certificate is valid.

Supported Protocols & Cipher Strength

• Checks: The TLS/SSL protocols (TLS 1.2, TLS 1.3) and encryption ciphers supported by your server.
• Why it Matters: Outdated and insecure protocols like SSL 2.0/3.0 are vulnerable and should be disabled.

Why Regularly Checking Your SSL Certificate is Crucial

• Prevent Security Warnings: Avoid the "Your connection is not private" message that destroys user trust and increases bounce rates.
• Boost SEO Rankings: Google confirms HTTPS is a ranking signal. A valid SSL certificate is non-negotiable for modern SEO.
• Protect User Data: SSL encrypts all data between the user's browser and your server, safeguarding login credentials, personal information, and payment details.
• Build Trust: The padlock icon in the address bar is a universal symbol of security, assuring visitors your site is legitimate.

Common SSL Issues and How to Fix Them

• Problem: "Certificate Expired"
  • Solution: Contact your hosting provider or SSL issuer to renew the certificate immediately. Set a calendar reminder for 4 weeks before the next expiration.
• Problem: "Certificate Not Trusted" / "Chain Incomplete"
  • Solution: This often means intermediate certificates are not properly installed on your server. Your hosting provider can usually fix this quickly.
• Problem: "Hostname Mismatch"
  • Solution: The SSL certificate was issued for a different domain (e.g., www.domain.com vs. domain.com). Ensure you have a certificate that covers all versions of your domain (a Subject Alternative Name - SAN - certificate).
• Problem: "Weak Cipher Suite"
  • Solution: Update your server configuration to disable weak encryption protocols and ciphers. Your web host or system administrator can assist.

Frequently Asked Questions (FAQ)

Q: How often should I check my SSL certificate?
A: We recommend checking it at least once a quarter. The best practice is to monitor it proactively. Set a reminder for 2-4 weeks before the expiration date to allow ample time for renewal.

Q: What's the difference between SSL and TLS?
A: TLS (Transport Layer Security) is the updated, more secure version of the older SSL (Secure Sockets Layer) protocol. While the term "SSL" is still commonly used, most modern websites actually use TLS. Our checker verifies both.

Q: Can I check the SSL certificate for any website?
A: Yes! Our free SSL Checker works for any public website. Just enter the domain name to see its SSL details and configuration.

Q: My SSL is valid, but my site still shows "Not Secure." Why?
A: This is often caused by "mixed content," where your HTTPS page loads resources (like images, scripts, or CSS files) over an insecure HTTP connection. Use your browser's developer console to identify and fix these insecure requests.

Secure Your Entire Online Presence with our SSL Checker