What is the most privacy-conscious Referrer-Policy?

strict-origin-when-cross-origin is the modern web standard. It sends full URLs for same-origin requests, sends domain-only for HTTPS cross-origin requests, and sends no referrer when downgrading from HTTPS to HTTP.

How do I add security headers in Next.js?

In Next.js, configure security headers inside the headers() function of next.config.js or next.config.mjs to apply them server-side across all incoming requests.

What is X-Content-Type-Options nosniff?

It prevents browsers from trying to guess ('sniff') the MIME type of a file, ensuring that stylesheets and scripts are only executed if they are served with valid MIME types.

Security Headers & Meta Tag Generator

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Generate client-side Content-Security-Policy (CSP), Referrer-Policy, and X-Content-Type-Options meta tags for web apps.

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Security Headers Meta Generator Generator

Generate client-side Content-Security-Policy (CSP), Referrer-Policy, and X-Content-Type-Options meta tags for web apps.

Presets:

Configuration Inputs

Content-Security-Policy (CSP)

Referrer-Policy

Controls what referrer information is sent when users click outbound links.

<!-- Client-Side Security Headers (HTML Head) -->
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; img-src 'self' https: data:; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline';" />
<meta name="referrer" content="strict-origin-when-cross-origin" />
<meta http-equiv="X-Content-Type-Options" content="nosniff" />

100% Client-Side Private Generator2026 Standards Compliant

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The Web Developer's Guide to Security Headers & Browser Hardening

Comprehensive Technical Guide & Best Practices

1Why Client-Side Security Headers Protect Modern Web Apps

Security headers tell the browser how to behave when handling your site's content, effectively neutralizing common web vulnerabilities like Cross-Site Scripting (XSS), clickjacking, MIME-type sniffing, and data leakage. While HTTP response headers set at the server/CDN level offer the highest protection, HTML <meta http-equiv> tags provide an essential fallback for static sites and client-side applications.

Implementing Content Security Policy (CSP) and strict Referrer Policies builds user trust and protects sensitive tokens from malicious third-party script injection.

Key Optimization Takeaways

CSP restricts script execution to trusted domains, preventing XSS attacks.
strict-origin-when-cross-origin prevents leaking sensitive URL query parameters to third-party destinations.
X-Content-Type-Options: nosniff blocks browsers from executing malicious non-script files.

Frequently Asked Questions

Answers to common questions about Security Headers Meta Generator

Yes, you can set CSP using <meta http-equiv="Content-Security-Policy" content="...">. However, frame-ancestors, report-uri, and sandbox directives must be set via server HTTP response headers.

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