SEENERA security toolFree browser tool

Content Security Policy Builder

Generate a practical Content-Security-Policy header from trusted source lists.

Local browser processing Responsive workspace

Secure tool workspace

default-src sourcesscript-src sourcesstyle-src sourcesimg-src sourcesconnect-src sourcesfont-src sourcesframe-src sourcesUpgrade insecure requests

Enter your values and run the tool. Your input stays in this browser.

Clear by design

How to use Content Security Policy Builder

1Add the requested files, values or creative direction.
2Review settings, limits and estimated cost or privacy notices before running.
3Process the result inside your browser, then download or copy it.

Privacy and analytics

Local tool inputs and files stay in the browser. SEENERA analytics records only the tool name, event type, response time and technical status—not the content or file bytes.