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SSL Checker - Check Certificate Expiry & Security | ToolsAid

Free Online SSL Checker. Verify SSL/TLS certificate validity, expiry date, and trust chain. Diagnose installation issues and ensure your website is secure.

No Domain Checked

Enter a domain URL to view its SSL certificate details.

key Features

  • Instant SSL Validity & Expiry Check
  • Analyze Certificate Chain (Root & Intermediate)
  • Detect TLS Version & Cipher Suites
  • Verify Hostname & Issuer Trust
  • Diagnose Common Installation Errors

The Free SSL Checker is an essential diagnostic tool for webmasters, developers, and IT administrators. Security is the backbone of the modern web, and a valid SSL certificate is now a requirement for SEO rankings and user trust.

Why Check Your SSL? Even if your site loads with "HTTPS", there might be underlying issues. Intermediate certificates might be missing (causing mobile errors), or you might be using outdated cipher suites. Our tool performs a deep scan to reveal the true health of your secure connection.

Understanding the Results

  • Validity Period: We show you the exact "Valid From" and "Valid To" dates so you know when to renew.
  • Issuer Information: verify that your certificate was issued by the Authority you paid (e.g., Let's Encrypt, DigiCert, Sectigo).
  • Technical Details: We display the Signature Algorithm (e.g., SHA256withRSA) to ensure it meets modern standards.

Don't let an expired certificate scare away your visitors with a "Not Secure" warning. Use ToolsAid to stay secure and trusted.

Frequently Asked Questions

What is an SSL Certificate?

SSL (Secure Sockets Layer) is the standard technology for keeping an internet connection secure and safeguarding any sensitive data that is being sent between two systems. It prevents criminals from reading and modifying any information transferred, including potential personal details.

Why is my SSL Certificate invalid?

Common reasons include: the certificate has expired, it was issued for a different domain name (mismatch), the issuer is not trusted (self-signed), or the intermediate certificate chain is incomplete.

How often should I check my SSL status?

It is recommended to check your SSL status whenever you install a new certificate, renew an old one, or make server configuration changes. Regular checks help ensure you don't get caught off guard by an unexpected expiration.

What is a Certificate Chain?

The chain of trust refers to your SSL certificate and how it is linked back to a trusted Root CA (Certificate Authority). Browsers trust your site because they trust the Root CA that issued your certificate.

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