CSP Nonce Generator — Secure Inline Scripts and Build Content Security Policies
Generate cryptographically random nonces for Content Security Policy script-src directives. Outputs a ready-to-use CSP header snippet, HTML script tag with the nonce attribute, and a meta tag fallback — all generated locally in your browser.
How to Use CSP Nonce Generator — Secure Inline Scripts and Build Content Security Policies
How to Use the CSP Nonce Generator:
Choose Nonce Length: Select 128-bit (16 bytes, recommended minimum) or 256-bit (32 bytes, higher entropy). Both provide strong security; 128-bit is sufficient for virtually all applications.
Choose Encoding: Base64 (standard) or Base64url (URL-safe, no +, /, = characters). Both are accepted by all browsers in CSP nonce attributes.
Generate: A new cryptographically random nonce is generated automatically when the page loads and each time you change options or click "Generate New Nonce".
Copy the Nonce Value: Use the Copy button next to the nonce to grab just the raw value for use in your server-side template.
Copy the HTTP Header Snippet: Use the generated Content-Security-Policy header in your web server or application middleware. This is the recommended way to deliver CSP — it cannot be bypassed by injected markup.
Copy the Script Tag: Use the <script nonce="..."> snippet as a template for your inline scripts. Every inline script that needs to run must have the matching nonce attribute.
Copy the Meta Tag (fallback): The <meta> tag version can be used in static HTML, but note it is less secure than the HTTP header — it does not protect against markup injection attacks.
IMPORTANT: Generate a fresh nonce server-side for every HTTP response. Never reuse a nonce. Reusing nonces defeats the entire purpose of CSP nonce-based policy.
Frequently Asked Questions
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