HTTPS & Transport Security
Verifies that pages are delivered over secure HTTPS and flags insecure plain HTTP connections.
Technical SEO Tools · Free Tool
HTTPS & Security Header Checker
Inspect SSL certificate configuration, HTTPS redirects, and crucial HTTP security headers that protect user privacy and boost search crawler confidence.
Step-by-step workflow
How the HTTPS & Security Header Checker Works
Run a real-time diagnostic scan in four simple steps — no sign-up or software installation required.
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01
Enter website URL
Provide any public domain or specific page URL to initiate the comprehensive security audit.
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02
Inspect protocol & certificate
Our auditor validates HTTPS protocol usage, redirect enforcement, and certificate delivery.
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03
Audit HTTP response headers
We verify presence and configuration of HSTS, CSP, X-Frame-Options, and Referrer-Policy headers.
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04
Harden web server headers
Apply suggested configuration snippets to your web server to achieve an A+ security posture.
Diagnostic coverage
What This Tool Checks
Verified against modern search engine quality guidelines and technical best practices.
HSTS Header Enforcement
Checks Strict-Transport-Security to ensure browsers automatically force HTTPS communication.
Content Security Policy (CSP)
Validates CSP headers to protect against Cross-Site Scripting (XSS) and code injection vulnerabilities.
Clickjacking & Framing Guard
Inspects X-Frame-Options and frame-ancestors to prevent malicious iframe embedding.
Practical best practices
How to Fix Common Issues
Practical steps to resolve common deficiencies and improve search visibility.
Enforce Sitewide HSTS with Preload
Add Strict-Transport-Security: max-age=31536000; includeSubDomains; preload to guarantee encrypted communication.
Define a Robust Content Security Policy
Configure CSP directives to explicitly declare approved sources for scripts, stylesheets, and embedded frames.
Eliminate Insecure Mixed Content
Update internal links, script sources, and media assets in HTML templates to use https:// or relative paths.
Configure X-Content-Type-Options: nosniff
Instruct browsers not to infer MIME types other than declared content types to stop drive-by attacks.
Questions & answers
Frequently Asked Questions
Everything you need to know about using this tool and understanding your results.
Why is HTTPS essential for website SEO?
Google treats HTTPS as an active ranking signal and marks unencrypted HTTP sites as not secure in browsers, driving away potential clients and damaging trust.
What does the HSTS security header do?
HTTP Strict Transport Security (HSTS) instructs modern web browsers to automatically communicate with your website exclusively over secure HTTPS connections.
What is Content-Security-Policy (CSP)?
Content-Security-Policy is an HTTP response header that prevents cross-site scripting (XSS), data injection, and malicious clickjacking by restricting approved sources.
What is mixed content and why is it dangerous?
Mixed content occurs when an initial HTTPS webpage loads subordinate scripts, stylesheets, or images over unencrypted HTTP, leaving visitors vulnerable to tampering.
How do I add security headers to my web server?
You can configure security headers directly in your Nginx, Apache, or Cloudflare configuration files, or inject them through Express middleware in Node.js applications.
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