CSP Inline Hash Generator | Create SHA-256 Hashes for Your Content Security Policy

This tool generates SHA-256 hashes for inline scripts and styles, allowing you to securely whitelist them in your Content Security Policy (CSP). Instantly create the correct hash format to enhance your website's security without compromising functionality.

💡 Tool Overview

• Real-time Hash Generation: The tool automatically computes the SHA-256 hash as you type or paste your code, providing instant results.
• CSP Compliance: Easily generate the 'sha256-...' value required for script-src and style-src directives, enabling you to avoid the insecure 'unsafe-inline' keyword.
• Secure & Private: All processing is done directly in your browser using the Web Crypto API. Your code is never sent to a server, ensuring complete privacy.
• Standard-Compliant Output: The output is formatted correctly with the required algorithm prefix and Base64 encoding, ready to be copied directly into your CSP header.

🧐 Frequently Asked Questions

Q. What is a CSP hash?

A. A CSP hash is a cryptographic hash (e.g., SHA-256) of an inline script or style block. By including this hash in your Content Security Policy header, you instruct the browser to execute only the scripts or apply styles that perfectly match this hash. This is a secure mechanism to prevent Cross-Site Scripting (XSS) attacks by blocking unauthorized or injected inline code.

Q. Why should I use a hash instead of 'unsafe-inline'?

A. The 'unsafe-inline' directive allows any inline script or style to execute, which significantly weakens your site's security and negates many of the protections CSP offers. Using hashes provides a granular approach, allowing you to approve specific, intentional inline code while blocking all other potentially malicious code.

Q. Does this tool support SHA-384 or SHA-512?

A. This tool exclusively generates SHA-256 hashes, which is the most widely supported and commonly used algorithm for CSP hashing in modern browsers.

📚 Technical Insights on CSP Hashes

When generating a CSP hash, it's crucial to understand that the hash is calculated from the exact byte sequence of the script or style content. This means that any whitespace, including spaces, tabs, and line endings, is part of the content and will alter the final hash. Be sure to paste the code exactly as it appears in your HTML source.

The hash should be generated only from the content inside the <script> or <style> tags, not the tags themselves. Including the HTML tags in the input will result in an incorrect hash that the browser will not recognize. This tool is designed to process the raw script or CSS content directly, just as a browser would.