SRI Hash Generator
LiveGenerate Subresource Integrity hashes for CDN script and link tags.
Understanding Data Encoding & Security
Subresource Integrity (SRI) is a W3C security feature that allows browsers to verify that resources loaded from CDNs or third-party hosts have not been tampered with. When you add an integrity attribute to a <script> or <link> tag, the browser computes a hash of the downloaded file and compares it against the expected hash — if they do not match, the resource is blocked. SRI protects against CDN compromises, man-in-the-middle attacks, and supply chain attacks where malicious code is injected into popular libraries hosted on public infrastructure.
Generate Subresource Integrity (SRI) hashes for JavaScript and CSS files loaded from CDNs. Paste the file content or URL, choose the hash algorithm (SHA-256, SHA-384, SHA-512), and get the complete integrity attribute value ready to add to your script or link tags. Protects against compromised CDNs.
The Devkitr SRI Hash Generator computes the cryptographic hash of JavaScript or CSS file content and outputs the correct integrity attribute value for your HTML tags. Paste the file content or provide a URL to generate the SHA-256, SHA-384, or SHA-512 hash in the SRI format (e.g., sha384-...) ready to add as an integrity attribute to your <script> or <link> tags.
In a typical development workflow, SRI Hash Generator becomes valuable whenever you need to generate subresource integrity hashes for cdn script and link tags. Whether you are working on a personal side project, maintaining production applications for a company, or collaborating with a distributed team across time zones, having a reliable browser-based generation tool eliminates the need to install desktop software, write one-off scripts, or send data to third-party services that may log or retain your information. Since SRI Hash Generator processes everything locally on your device, your data stays private and your workflow stays uninterrupted — open a browser tab, paste your input, get your result.
Key Features
Multiple Hash Algorithms
Generate SRI hashes using SHA-256, SHA-384 (recommended), or SHA-512 algorithms. SHA-384 is the standard choice used by most CDN providers.
Ready-to-Paste Output
Outputs the complete integrity attribute value in the correct format (sha384-BASE64HASH) and generates the full HTML tag with integrity and crossorigin attributes.
URL Fetching Support
Enter a CDN URL to fetch the resource content and compute its hash automatically — faster than manually downloading and pasting file content.
Multi-Hash Output
Generate hashes for multiple algorithms simultaneously so you can include fallback hashes for broader client compatibility.
How to Use SRI Hash Generator
Provide the Resource
Paste the full content of a JavaScript or CSS file, or enter its CDN URL to fetch the content automatically.
Select a Hash Algorithm
Choose SHA-384 (recommended standard), SHA-256, or SHA-512 based on your security requirements and browser support needs.
Copy the Integrity Value
Copy the generated integrity attribute value (sha384-xxxxx) for use in your HTML script or link tags.
Add to Your HTML
Add the integrity attribute and crossorigin="anonymous" to your <script> or <link> tag that loads the CDN resource.
Use Cases
Securing CDN-Hosted Libraries
Add SRI hashes to script and link tags loading jQuery, React, Bootstrap, or other libraries from public CDNs to detect if the CDN serves altered files.
Supply Chain Security
Verify that third-party dependencies have not been modified by generating and pinning hashes for every external resource your application loads.
Compliance Requirements
Security standards like PCI DSS and SOC 2 recommend SRI for externally loaded scripts. Generate hashes to meet compliance audit requirements.
Automated Build Pipeline Integration
Generate SRI hashes as part of your CI/CD build process to automatically update integrity attributes whenever CDN resource versions change.
Pro Tips
Use SHA-384 for SRI hashes — it's the recommended algorithm with the best balance of security and broad browser support.
Always include crossorigin="anonymous" on tags with integrity attributes when loading resources from different origins — SRI requires CORS to function.
Regenerate SRI hashes whenever you update CDN library versions — mismatched hashes will block the updated resource from loading.
Consider hosting critical resources yourself if SRI hash mismatches are causing intermittent failures — this eliminates third-party dependency for essential scripts.
Common Pitfalls
Adding integrity attributes without crossorigin="anonymous"
Fix: SRI requires CORS for cross-origin resources. Without crossorigin, the browser cannot verify the hash and will either ignore the integrity check or block the resource.
Not updating SRI hashes when library versions change
Fix: Each file version produces a different hash. When updating a CDN URL to a new version, regenerate the SRI hash or the resource will be blocked.
Applying SRI to resources that change dynamically
Fix: SRI only works for static resources with consistent content. Dynamically generated scripts or API-injected content will fail hash verification every time.
Frequently Asked Questions
QWhich hash algorithms are supported?
SHA-256, SHA-384, and SHA-512. SHA-384 is the most commonly used for SRI.
QCan I hash a file by URL?
You can paste the file content directly. Fetching by URL may be blocked by CORS policies on some CDNs.
QWhat is the output format?
The output is the complete integrity attribute value (e.g., sha384-abc123...) plus a ready-to-use HTML tag example.
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