SSL Checker
Inspect SSL/TLS certificates for a domain.
Ensuring a secure connection for your website is paramount, and that begins with a valid SSL/TLS certificate. Tool World's SSL Checker provides a crucial service for webmasters, developers, and anyone concerned with online security. This utility allows you to instantly fetch and decode the certificate details for any public domain. For instance, after deploying a new certificate or renewing an old one, you can use the SSL Checker to confirm it's correctly installed and active across your servers. If your website visitors are seeing "Your connection is not private" errors, this tool can help diagnose if it's an expired certificate, a common name mismatch, or a broken certificate chain.
Simply input your domain name, and the SSL Checker will output critical information such as the issuer, common name, expiration date, subject alternative names (SANs), and the complete certificate chain. It also flags potential issues like invalid dates or untrusted issuers. A common use case is proactively monitoring your certificates to prevent unexpected expirations, or quickly troubleshooting browser security warnings affecting your users. While the tool provides comprehensive details about the publicly served certificate, it cannot inspect certificates on internal networks or local development environments that aren't publicly accessible. Always cross-reference the reported common name and SANs with your intended domain to ensure a perfect match.
How to use SSL Checker
Enter Domain Name
Type the full domain name of the website you wish to inspect into the input field (e.g., www.example.com).
Initiate Check
Click the "Check SSL" button to submit your request and begin the certificate inspection.
Review Summary
The tool will display a concise overview including the certificate's status, issuer, and expiration date.
Explore Details
Expand the "Certificate Details" section to view the full certificate chain, subject alternative names, and other technical specifications.
Interpret Status & Tips
Look for green "Valid" indicators. If issues are found, review the specific error messages provided to understand potential misconfigurations or problems.
Frequently Asked Questions
What specific information does the SSL Checker provide?
The SSL Checker provides comprehensive details including the certificate issuer, common name, expiration date, subject alternative names (SANs), public key information, signature algorithm, and the complete certificate chain leading back to a trusted root authority. It also indicates the certificate's current validity status.
Can this tool identify why my browser shows an SSL error, like "NET::ERR_CERT_DATE_INVALID"?
Yes, the SSL Checker is highly effective at diagnosing common browser SSL errors. It will clearly indicate if a certificate is expired, if there's a hostname mismatch, or if there are issues within the certificate chain that prevent browsers from trusting it.
Does the SSL Checker support wildcard certificates or certificates with multiple SANs?
Absolutely. The tool correctly parses and validates wildcard certificates (e.g., *.example.com) and certificates that include multiple Subject Alternative Names (SANs), ensuring all covered domains are properly listed and verified.
What's the difference between SSL and TLS, and which one does this tool check?
SSL (Secure Sockets Layer) is the older, deprecated protocol, while TLS (Transport Layer Security) is its modern, more secure successor. While often still referred to as SSL, almost all secure websites today use TLS. This tool checks for the presence and validity of the current TLS protocol certificates.
Can I check the SSL certificate of a website hosted on my local machine or private network?
No, the SSL Checker can only inspect certificates for publicly accessible domain names over the internet. It cannot reach or validate certificates on internal networks, development environments, or local hosts that are not exposed publicly.
Does using this SSL Checker cost anything?
No, Tool World's SSL Checker is a completely free online utility designed for anyone to use without any charges or hidden fees.