Content Security Policy Generator — XSS Shield Builder
Build Content Security Policy headers interactively. Toggle directives like script-src, style-src, and img-src, select allowed source tokens, and add custom origins. Instantly outputs your CSP as an HTTP header, meta tag, Nginx directive, or Apache header.
How to Use Content Security Policy Generator — XSS Shield Builder
How to Use the Content Security Policy Generator
Step 1: Enable Directives
Each card represents a CSP directive. Toggle a directive ON to include it in your policy. Start with the basics:
- default-src — The catch-all fallback. Set this first; it applies to any directive you leave off.
- script-src — Controls where JavaScript can load from. The most critical directive for XSS protection.
- style-src — Controls CSS sources.
- img-src — Controls image sources.
data:is often needed for inline base64 images. - object-src — Set this to
noneto block plugins like Flash.
Step 2: Choose Source Keywords
Click the chips to toggle source keywords on or off:
| Keyword | Meaning |
|---|---|
self | Same origin only — recommended baseline |
none | Block all sources |
https: | Any HTTPS source |
data: | data: URIs |
blob: | blob: URLs |
unsafe-inline | Allow inline code/styles — reduces security ⚠️ |
unsafe-eval | Allow eval() — reduces security ⚠️ |
strict-dynamic | Trust hashed/nonce scripts to load others |
* | Wildcard — any source — avoid in production ⚠️ |
Step 3: Add Custom Origins
For each directive, type specific allowed origins in the text field — space-separated:
https://cdn.example.com https://fonts.googleapis.com
Step 4: Copy in Your Preferred Format
| Format | When to use |
|---|---|
| Value | Paste directly into server config |
| HTTP Header | Full header string with directive name |
| Meta tag | Embed in HTML head |
| Nginx | Paste into nginx.conf server block |
| Apache | Paste into .htaccess or virtual host config |
Report-Only Mode
Enable Report-Only mode to test your policy without blocking anything. The browser logs violations but does not enforce the policy. Add a report-uri to receive violation reports at an endpoint you control.
Recommended Starting Point
default-src self; script-src self; style-src self; img-src self data:; object-src none; base-uri self
Once deployed in Report-Only mode, monitor violations for a week, then switch to enforcing.
Frequently Asked Questions
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