MyAITools
Builder

CSP Header Builder

CSP Header Builder is a free online builder that helps you build a Content-Security-Policy header interactively; select policies for each directive and get the full header string. CSP Header Builder uses 7 input fields, returns 3 output values, and runs in your browser on the device.

Key facts

Inputs
7 fields: default-src, script-src, style-src, img-src, font-src, connect-src, and frame-src
Outputs
3 values: CSP Header, HTML <meta> tag, and Directive breakdown
Runtime
your browser on the device
Mode
Builder
Privacy
Files and text stay in the browser session.
Cost
$0, no account required

How to use CSP Header Builder

  1. 1

    Paste or fill in the input

    Enter your text or values into the input fields on the page.

  2. 2

    Run the utility

    Click Compute to run the utility in your browser and review the result.

  3. 3

    Copy the output

    Copy the output value you need from the result panel.

CSP Header Builder details

First, enter default-src in CSP Header Builder. Next, review CSP Header, HTML <meta> tag, and Directive breakdown. Additionally, CSP Header Builder uses 7 input fields and 3 output blocks so the result is easy to scan and copy.

Configure the most common Content-Security-Policy (CSP) directives through simple dropdowns: default-src, script-src, style-src, img-src, font-src, connect-src, and frame-src. Each directive can be set to 'none' (block all), 'self' (same-origin only), 'self' + 'unsafe-inline', 'self' + 'unsafe-inline' + 'unsafe-eval', or '*' (allow any). The tool generates both the HTTP header value and the HTML <meta> tag version. Useful for web developers hardening their sites against XSS, clickjacking, and data injection attacks. CSP is a critical layer of defense recommended by OWASP and required for many compliance frameworks. Generated entirely in your browser.

Common searches

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Frequently asked

What is CSP Header Builder?

CSP Header Builder is a free online builder that helps you build a Content-Security-Policy header interactively; select policies for each directive and get the full header string. CSP Header Builder uses 7 input fields, returns 3 output values, and runs in your browser on the device.

What inputs and outputs does CSP Header Builder use?

CSP Header Builder uses 7 input fields: default-src, script-src, style-src, img-src, font-src, connect-src, and frame-src. CSP Header Builder returns 3 output values: CSP Header, HTML <meta> tag, and Directive breakdown.

Do my files and data stay private?

Yes. CSP Header Builder runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.

How do I use CSP Header Builder?

Open CSP Header Builder, paste or fill in the input fields, and the result updates instantly. CSP Header Builder runs in your browser with no upload and no waiting.

Which browsers does CSP Header Builder support?

Any modern browser works in Chrome, Firefox, Safari, and Edge on desktop and mobile. CSP Header Builder uses standard web APIs and does not require any plugin, extension, or sign-up.