NexTool

SSL Certificate Checker

Verify that a website is properly secured with HTTPS. Check SSL certificate status, measure response time, and review recommended security headers (HSTS, CSP, X-Frame-Options, and more). All checks run from your browser with a simple domain lookup.

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SSL Certificate Checker

How to Use SSL Certificate Checker

  1. 1Enter a domain name (e.g., example.com)
  2. 2Click Check SSL to verify the connection
  3. 3Review the security status and response time
  4. 4Check the security headers recommendations

Frequently Asked Questions

What is an SSL certificate?▾

An SSL (Secure Sockets Layer) certificate encrypts data transmitted between a user's browser and a website. It enables HTTPS (the padlock icon) and protects sensitive information like passwords and credit card numbers from interception. Modern certificates use TLS (Transport Layer Security), the successor to SSL.

Why is HTTPS important for SEO?▾

Google confirmed HTTPS as a ranking signal in 2014. Sites without HTTPS show a 'Not Secure' warning in Chrome, which increases bounce rates. HTTPS also enables HTTP/2 for faster page loads and is required for many modern browser APIs.

What are security headers?▾

Security headers are HTTP response headers that add extra protection: HSTS forces HTTPS, CSP controls which resources load, X-Frame-Options prevents clickjacking, X-Content-Type-Options prevents MIME sniffing, and Referrer-Policy controls referrer information shared with other sites.

About SSL Certificate Checker

Verify that a website is properly secured with HTTPS. Check SSL certificate status, measure response time, and review recommended security headers (HSTS, CSP, X-Frame-Options, and more). All checks run from your browser with a simple domain lookup.

NexTool's SSL Certificate Checker is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.

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