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Verify SSL/TLS certificate details including issuer, SAN list, and expiry dates. Use our free tool to detect expired certificates and ensure HTTPS security.
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In the modern web landscape, security is not just an option—it is a requirement. Every time a user visits a website, a complex handshake occurs in the background to establish a secure, encrypted connection. At the heart of this process lies the SSL/TLS certificate. However, these certificates are not permanent; they have strict validity periods, specific technical configurations, and various metadata that determine how a browser trusts a site.
Failing to monitor your certificate status can lead to catastrophic "Your connection is not private" warnings, which drive away traffic and damage brand reputation. Whether you are a system administrator, a web developer, or a security enthusiast, having a reliable way to inspect these digital credentials is essential for maintaining a healthy online presence.
This is where the SSL Certificate Checker becomes an indispensable part of your toolkit. By providing a direct, server-side inspection of any domain's security certificate, it removes the guesswork from HTTPS management and ensures you are always aware of your encryption status.
The SSL Certificate Checker is a specialized security tool designed to inspect any HTTPS site's TLS certificate with precision. Unlike many web-based tools that rely on cached data or third-party APIs, this tool connects directly via TLS from our server to the target domain. This ensures that the information you receive is the most accurate, real-time representation of the certificate currently being served by the web server.
The tool parses the complex data within a certificate and presents it in a human-readable format. It identifies the issuer, the subject, and critical technical details like key types and signature algorithms. Most importantly, it calculates the exact time remaining before a certificate expires, helping you avoid the pitfalls of unplanned downtime due to expired credentials.
Using a dedicated checker offers several advantages over simply clicking the padlock icon in a browser. While browsers provide a surface-level view, the SSL Certificate Checker provides a deep dive into the technical properties that affect cross-browser compatibility and security strength.
One of the primary benefits is the ability to detect near-expiry certificates before they become a problem. By knowing exactly how many days are left until expiry, teams can schedule renewals during maintenance windows rather than reacting to a site outage. Additionally, because the tool connects directly via TLS, it can verify that the server is correctly configured to present the certificate you expect, bypassing any local browser caching that might hide recent changes.
The SSL Certificate Checker is built to provide a comprehensive overview of a domain's security profile. Based on its technical manifest, here are the specific details the tool can extract and display:
Using the tool is straightforward and requires no technical configuration on your part. Follow these steps to audit your domain:
example.com). You do not need to include the protocol, as the tool is specifically designed for HTTPS/TLS inspection.There are several real-world scenarios where this tool proves invaluable for developers and security professionals:
Before launching a new site or migrating to a new hosting provider, use the checker to ensure the SSL certificate is correctly installed and covers all necessary subdomains via the SAN list. This prevents "Certificate Mismatch" errors upon launch.
For organizations managing multiple domains, the tool serves as a manual audit point. You can quickly verify if an automated renewal (like Let's Encrypt) successfully triggered by checking the new validity dates and the updated days until expiry.
If users report that they cannot access your site securely, use the tool to see if the certificate has expired or if the signature algorithm is outdated and no longer supported by modern browsers.
Security researchers can use the tool to inspect the key type and signature algorithm of a site to ensure they meet modern security standards, such as moving away from legacy SHA-1 signatures to more secure SHA-256 options.
api.yourdomain.com) in the certificate request.Yes. The tool explicitly checks validity dates and highlights if a certificate has already expired or is nearing its expiry date, providing a clear count of days remaining.
No. The SSL Certificate Checker connects directly to the target domain's server via a TLS connection from our own server. This ensures the data is fetched in real-time and remains highly accurate.
SAN stands for Subject Alternative Name. This list shows all the different domain names and subdomains that the certificate is valid for. It allows one certificate to secure multiple addresses.
Yes. The tool identifies and displays the signature algorithm (such as SHA-256) and the key type used in the certificate, which is vital for ensuring compliance with modern security standards.
Maintaining a valid and correctly configured SSL/TLS certificate is the foundation of web trust. With the SSL Certificate Checker, you have a powerful, free, and direct way to inspect the technical heart of your site's security. Don't wait for a browser warning to tell you something is wrong—proactively manage your certificates, verify your SAN lists, and keep a close eye on your expiry dates.
Ready to audit your site? Visit https://toolsy.my/t/ssl-cert-checker now and ensure your HTTPS connection is solid.
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