SRI Hash Generator
Generate W3C Subresource Integrity (SRI) cryptographic hashes for third-party scripts and stylesheets. Protect against CDN tampering and XSS with hardware-accelerated SHA-384, SHA-256, and SHA-512 digests.
W3C Subresource Integrity
integrity="sha384-oqVuAfXR..."
Subresource Integrity Digest Generator
Subresource Integrity (SRI) is a critical W3C web security specification that enables web browsers to verify that resources fetched from third-party Content Delivery Networks (CDNs) or external servers have not been manipulated, hijacked, or infected with malicious code.
By including an integrity attribute containing a cryptographic hash digest on `<script>` and `<link>` elements, the browser computes the hash of the delivered asset and compares it to your expected digest. If even a single character has been modified by an attacker or compromised CDN, the browser will immediately block execution.
The SRI Hash Generator allows developers to paste asset code or upload local script and CSS files to instantly generate W3C-compliant sha384, sha512, and sha256 digests alongside ready-to-embed HTML tags with the mandatory crossorigin='anonymous' attribute.
Core Tool Capabilities
- W3C Recommendation Compliance: Computes Base64-encoded digests prefixed with the algorithm identifier (e.g., sha384-.) following the official W3C Subresource Integrity standard.
- Ready-to-Use HTML Snippets: Generates copy-pasteable <script> and <link> tags pre-configured with integrity and crossorigin attributes.
- Multi-Algorithm Integrity: Simultaneously computes SHA-384, SHA-512, and SHA-256 digests for cross-browser fallback compatibility.
- Dual Input Modes: Accepts pasted code strings or direct file uploads (.js, .css, .wasm, .json) with instant local computation.
- Live SRI Verification: Paste an existing SRI attribute from an external CDN to verify whether it matches the actual asset content.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • CDN Script Protection
- • Payment & Checkout Compliance
- • Build Pipeline Validation
Technical Specifications & Platform Limits
Full compliance with W3C SRI specifications.
Integrated crossorigin='anonymous' attribute inclusion.
Pure in-browser memory hashing.
Hardware-accelerated SubtleCrypto digest operations.
Step-by-Step Workflow
Select Input Mode
Choose 'Paste Code Content' to paste script/style text, or 'Upload Local File' to select a local asset.
Enter CDN URL
Provide the public CDN or hosting URL where the script or stylesheet will be loaded from.
Select Primary Algorithm
Choose SHA-384 (W3C standard), SHA-512, or SHA-256.
Copy HTML Tag
Copy the complete <script> or <link> snippet into your website's HTML template.
Practical Real-World Use Cases
CDN Script Protection
Protecting frontend web apps loading jQuery, Bootstrap, React, or analytics libraries from public CDNs against supply-chain attacks.
Payment & Checkout Compliance
Meeting PCI-DSS 4.0 requirements for monitoring and guaranteeing the integrity of scripts loaded on checkout and payment pages.
Build Pipeline Validation
Verifying that static asset bundles generated by bundlers match the integrity hashes listed in deployment manifests.
Frequently Asked Questions
- Why does the W3C recommend SHA-384 over SHA-256 for SRI?
- The W3C recommends SHA-384 because it offers superior collision resistance on 64-bit architectures with minimal performance overhead, making it the safest balance between cryptographic strength and execution speed.
- Why is the crossorigin='anonymous' attribute required?
- Cross-Origin Resource Sharing (CORS) is required by web browsers for SRI checks on third-party resources. Without crossorigin='anonymous', the browser will block the resource to prevent cross-origin information leakage.
- Are my asset files uploaded to your servers?
- No. All file reading and cryptographic hashing take place directly inside your browser using client-side Web Crypto APIs. Nothing is uploaded or stored remotely.
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Learn the workflows, common mistakes, and advanced techniques behind SRI Hash Generator with our deep-dive educational content.