SRI Hash Generator

Generate Subresource Integrity (SRI) hashes for your CDN scripts and stylesheets instantly in the browser. Copy ready-to-use HTML snippets for secure resources.

🔒 100% Secure: All hashing is performed locally in your browser using Web Crypto API. No data is sent to any server.

Hash Algorithm

SHA-384 is recommended for most use cases as it provides a good balance between security and performance.

Resource URL

Note: CORS must be enabled on the resource. If fetch fails, use paste mode.

How to Use the SRI Generator Tool

Quick Start Guide

1Enter a CDN URL, upload a file, or paste content directly
2Select your preferred hash algorithm (SHA-384 recommended)
3Copy the generated SRI hash or HTML snippet

What You Get

✓SHA-256, SHA-384, and SHA-512 hashes
✓Ready-to-use HTML snippets
✓Batch processing for multiple URLs
✓Export options (TXT/HTML)

Example HTML Output:

<script src="https://cdn.jsdelivr.net/npm/jquery@3.6.0/dist/jquery.min.js"
        integrity="sha384-vtXRMe3mGCbOeY7l30aIg8H9p3GdeSe4IFlP6G8JMa7o7lXvnz3GFKzPxzJdPfGK"
        crossorigin="anonymous"></script>

What is Subresource Integrity (SRI)?

Subresource Integrity (SRI) is a security feature that enables browsers to verify that resources they fetch (for example, from a CDN) are delivered without unexpected manipulation. It works by allowing you to provide a cryptographic hash that a fetched resource must match.

When you include external scripts or stylesheets in your web pages, you're trusting that the CDN or external server hasn't been compromised. SRI adds an extra layer of security by ensuring the file content matches exactly what you expect.

🔒 SHA-256

Fast and secure for most use cases. Produces 256-bit hash.

✅ SHA-384 (Recommended)

Best balance between security and performance. Industry standard.

🛡️ SHA-512

Maximum security with 512-bit hash. Highest protection level.

Frequently Asked Questions

Do I need SRI for all external resources?

While not required, it's highly recommended for any external scripts or stylesheets, especially from third-party CDNs. It adds minimal overhead but significantly improves security by protecting against compromised CDN resources and man-in-the-middle attacks.

What happens if the CDN updates the file?

The browser will block the resource because the hash won't match. This is intentional security behavior - you should pin specific versions in your CDN URLs and update hashes deliberately when upgrading. Avoid using "latest" or version ranges.

Which hash algorithm should I choose?

SHA-384 is recommended for most use cases as it provides strong security with reasonable hash length and is the industry standard. Use SHA-512 for maximum security or SHA-256 if you need shorter hashes. You can also specify multiple algorithms for broader compatibility.

Is my data secure when using this tool?

Absolutely! All hashing is performed locally in your browser using the Web Crypto API. No data is sent to any server or third party. Your scripts, URLs, and content remain completely private. The tool even works offline after initial page load.

Can I use SRI with dynamic content?

SRI is designed for static resources with predictable content. It's not suitable for dynamically generated scripts or resources that change frequently. Use SRI for versioned CDN libraries, frameworks, and static assets.

Does SRI slow down my website?

The performance impact is negligible. Browsers compute hashes very quickly using native cryptographic functions, and the security benefits far outweigh any minimal overhead. SRI actually helps prevent security incidents that could severely impact performance.