Enter a domain name to check its SSL/TLS certificate
What We Check
How to Check an SSL Certificate
- 1
Enter the domain
Type the domain name or full URL of the website you want to inspect. You can enter just the domain like example.com or a full URL including https://. - 2
Run the certificate check
Click the Check Certificate button. The tool connects to the server, retrieves the SSL/TLS certificate, and begins analyzing its properties. - 3
Review the results
Examine the certificate details including validity dates, issuer information, key strength, protocol version, and Subject Alternative Names (SANs) listed on the certificate. - 4
Take action on issues
If the certificate is expired, expiring soon, or has configuration problems, renew it through your certificate authority or hosting provider. Set a reminder to check again before the next expiration date.
Common Use Cases
Website Owners and Administrators
Security Auditors and Penetration Testers
SEO Professionals
Developers and DevOps Engineers
Why Check SSL Certificates?
An SSL/TLS certificate is the foundation of secure communication on the web. It encrypts data exchanged between a visitor's browser and your server, preventing eavesdropping, tampering, and impersonation. Our SSL Certificate Checker lets you verify any domain's certificate in seconds, showing you expiration dates, issuer details, key strength, and Subject Alternative Names without needing to use command-line tools like openssl. Whether you manage one site or hundreds, regular certificate monitoring helps you avoid the browser security warnings that erode visitor trust and hurt your search rankings.
Beyond basic expiration checks, understanding your certificate chain matters. A broken chain, where an intermediate certificate is missing, can cause failures in certain browsers or mobile devices even when the leaf certificate itself is valid. This tool inspects the chain so you can catch those issues early. For a deeper look at your site's overall security posture, pair this checker with the Security Headers Analyzer to review HTTP response headers, or use the DNS Security Scanner to verify DNSSEC and DNS-level protections.
Google has confirmed that HTTPS is a ranking signal, and browsers like Chrome now label HTTP-only pages as "Not Secure." Running a quick SSL check is one of the easiest wins for both security and SEO. If you suspect a phishing or malicious site, the URL Safety Checker can help you investigate further. For email-related domain verification, the Email Security Checker validates SPF, DKIM, and DMARC records that complement your SSL setup.
How It Compares
Online SSL checkers range from simple expiration lookups to full-featured TLS scanners. Paid monitoring platforms like DigiCert or Qualys SSL Labs offer deep handshake analysis and automated alerting, but they often require account creation or are limited to a certain number of scans per day. Free browser-based tools, including this one, cover the most common checks: validity dates, certificate chain, key size, and SANs. For most website owners, developers, and SEO professionals, these checks are sufficient to catch the issues that actually cause downtime or ranking drops.
The main advantage of a browser-based SSL checker is speed and convenience. You do not need to install software, configure API keys, or remember openssl s_client syntax. Just enter a domain and get results. If you need deeper protocol-level analysis such as cipher suite enumeration or OCSP stapling verification, consider pairing this tool with a command-line scan or a service like SSL Labs for the occasional deep dive.