Online SRI Hash Generator
Generate subresource integrity hashes online. Use our free SRI hash generator to compute SHA-256, SHA-384, and SHA-512 attributes for secure CDN files.
About SRI Hash Generator
The SRI hash generator helps web developers create Subresource Integrity attributes for external scripts and stylesheets hosted on third-party CDNs. By defining expected cryptographic hashes in your HTML markup, you protect your site visitors from unauthorized code modifications and compromised dependencies.
This browser-based tool computes SHA-256, SHA-384, and SHA-512 digests directly on your device using the Web Crypto API. Your files and code are never transmitted to external servers, providing a private, secure, and instant way to harden your web assets for free.
Key features
- Supports SHA-256, SHA-384, and SHA-512 algorithms
- Generates ready-to-use HTML script and link tags
- Processes files entirely client-side for complete privacy
- Accepts direct text input or file uploads
- Calculates base64-encoded integrity digests instantly
- Free tool requiring no account registration
How to use SRI Hash Generator
- Paste your asset code or select a local file to hash.
- Choose your preferred cryptographic algorithm, such as SHA-384.
- Click the generate button to compute the integrity digest.
- Copy the resulting HTML snippet and paste it into your webpage.
Who is it for?
- Frontend developers securing CDN-delivered assets like React, jQuery, or Bootstrap
- Security engineers mitigating risk against compromised third-party dependencies
- DevOps teams generating verified integrity tags for production deployments
- Webmasters implementing strict Content Security Policy and PCI-DSS compliance standards
Frequently asked questions
What is Subresource Integrity (SRI)?
Subresource Integrity is a security specification that allows browsers to verify that resources fetched from third-party servers, such as CDNs, have not been altered or injected with malicious code.
Which hash algorithm should I select for SRI?
The W3C recommends SHA-384 for modern web development because it offers strong cryptographic collision resistance without impacting browser performance. SHA-256 and SHA-512 are also fully supported.
What happens if an SRI hash does not match the file?
If the computed hash of the downloaded asset does not match the integrity value declared in the HTML tag, the browser rejects the resource and blocks it from executing or styling the page.
Is this SRI generator safe to use for sensitive code?
Yes. This tool operates entirely inside your local browser via native client-side APIs, meaning your source code and files are never uploaded or exposed to our servers.
Why is the crossorigin attribute required with SRI?
The crossorigin attribute tells the browser to make a CORS request. Without it, the browser cannot read the cross-origin response body to verify the cryptographic hash, causing the asset to fail.