Security Headers Builder
Interactive security headers builder to configure CSP, HSTS, X-Frame-Options, and CORS for Nginx, Cloudflare, and Next.js with zero server uploads.
Browser onlyYour data never leaves this device.
All security score calculations and configuration generators run 100% locally in your browser. No domains, IPs, or server parameters are sent to external servers.
Details: Privacy policy
Outstanding posture protecting against XSS, clickjacking, and protocol downgrades.
Content-Security-Policy
Restrict which domains and endpoints scripts, styles, and assets may load from.
add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; connect-src 'self'; font-src 'self' https: data:; frame-ancestors 'none'" always;
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Frame-Options "DENY" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;
add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;Continue in Next Tool (Pipeline)
Transfer this output directly into complementary tools without re-uploading
Modern web applications require defense-in-depth security to protect user sessions and sensitive cookies against Cross-Site Scripting (XSS), malicious clickjacking frames, MIME sniffing, and network eavesdropping. This developer utility audits and generates production-ready HTTP response headers including Content-Security-Policy (CSP), Strict-Transport-Security (HSTS), Referrer-Policy, and Permissions-Policy. Everything compiles locally inside your client browser with ready-to-paste snippets for Nginx, Cloudflare Workers, Next.js, and Apache web servers.
How to use Security Headers Builder
- Customize Content-Security-Policy (CSP) trusted domains and frame directives.
- Enable Strict-Transport-Security (HSTS) duration and subdomain protection.
- Select your target server format (Nginx, Cloudflare, Next.js, or Apache).
- Copy the generated production snippet directly into your deployment config.
What you get
- Production-grade Nginx add_header directives
- Cloudflare Workers and Rules response header maps
- Next.js next.config.js async headers configuration
- Apache mod_headers and Caddy server snippets
When to use Security Headers Builder
- Hardening production web servers against OWASP Top 10 vulnerabilities.
- Achieving an A+ rating on Mozilla Observatory and SecurityHeaders.com audits.
- Configuring secure cross-origin resource sharing (CORS) for REST APIs.
Frequently asked questions about Security Headers Builder
What is the purpose of Content-Security-Policy (CSP)?
CSP restricts the origin of scripts, styles, images, and frames that the browser is permitted to execute, neutralizing the vast majority of reflected and stored Cross-Site Scripting (XSS) attacks.
Why is HSTS preload recommended for production domains?
HSTS preload instructs major browser vendors (Chrome, Firefox, Safari) to hardcode HTTPS-only connections for your root domain, preventing SSL stripping on the very first visit.
Are any server credentials or hostnames uploaded when using this tool?
No. All security header configurations and syntax templates are generated 100% locally on your device within your browser memory.
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