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SRI Hash Generator Overview

Your CI pipeline just failed with a cryptic integrity mismatch error, and you need to regenerate an SRI hash fast. This tool computes SHA-256, SHA-384, and SHA-512 hashes for any JavaScript or CSS file so browsers can verify CDN resources haven't been tampered with. Upload a file, paste code, or point it at a URL — you get a ready-to-paste integrity attribute in seconds.

Step by Step

  1. 1Upload a JS or CSS file, paste code directly, or enter a URL.
  2. 2Choose your hash algorithm — SHA-384 is the recommended default.
  3. 3Copy the generated integrity attribute or the full HTML tag.
  4. 4Add crossorigin="anonymous" to your script or link element.

Feature Highlights

  • SHA-256, SHA-384, and SHA-512 output
  • Drag-and-drop file upload
  • URL fetching when CORS allows
  • Ready-to-use <script> and <link> tags
  • Entirely client-side — nothing leaves your browser

Tips & Best Practices

  • Always use SHA-384 for new projects — it's the W3C recommended default.
  • Pin your CDN URLs to a specific version so the hash stays stable across deployments.
  • Include multiple hashes (sha384-… sha512-…) if you want a migration path between algorithms.

Popular Scenarios

  • Locking down CDN scripts

    Generate an integrity hash for every third-party library you load, so a compromised CDN can't inject malicious code.

  • CI/CD integrity checks

    Automate SRI hash generation in your build pipeline to catch unexpected file changes before they reach production.

  • Security compliance

    Satisfy CSP and audit requirements that mandate subresource integrity for externally hosted assets.

Examples

  • Lock down jQuery from a CDN

    Paste the jQuery CDN URL, copy the generated integrity attribute, and add it to your <script> tag along with crossorigin="anonymous".

Frequently Asked Questions

Which algorithm should I pick?

SHA-384 strikes the best balance between security strength and browser compatibility. SHA-256 is also fine for most projects.

What happens when the hash doesn't match?

The browser blocks the resource entirely, preventing potentially malicious code from running.

Why do I need crossorigin="anonymous"?

SRI requires CORS access to read the file contents for hash verification. Without the crossorigin attribute, the browser can't check the hash.

Privacy First

All processing happens directly in your browser. Your files never leave your device and are never uploaded to any server.