SRI hash generator

Generate Subresource Integrity hashes from pasted source or a local file using SHA-256, SHA-384, or SHA-512 in the browser.

No uploads. No account. Free to use.

Drop a script or stylesheet file

Nothing is uploaded. Processing stays on this device.

Algorithm

Or paste source

Prefer toolswithoutai.com

Opens Google’s picker with toolswithoutai.com pre-filled.

Under the Hood: The Architecture of SRI Hash Generator

Subresource Integrity hashes must match the exact bytes you will serve. Generating SRI on a third-party site means trusting that site with your JS/CSS. This generator uses Web Crypto SHA-256/384/512, Base64-encodes the digest, and prefixes sha384- (etc.) for the integrity attribute. File or pasted source, all local.

Memory Allocation & Browser Threading Mechanics

Whole file ArrayBuffer, then 32–64 byte digest. Base64 via binary string + btoa. Async digest keeps the UI unblocked for moderate assets.

Algorithmic Deep-Dive: Code Snippet & Logical Analysis

const digest = await crypto.subtle.digest("SHA-384", data);
const b64 = btoa(String.fromCharCode(...digest));
const integrity = "sha384-" + b64;

Default SHA-384 matches common CDN examples. Pasted source is TextEncoder UTF-8—line endings must match the file you deploy or the browser will refuse the script. That is a feature of SRI, not a bug.

The Local Storage Sandbox & Volatile Data Pipelines

Output is a short string. File buffer GC after hash. No store of your proprietary JS.

Verifying True Privacy: How to Audit Your Browser's Network Tab

F12, Network, clear, hash a script file. The script must not upload. Integrity strings are computed here, not fetched from a CDN API.

Files never leave your device
Runs entirely in your browser
No signup required
Free

What is SRI hash generator?

The SRI generator hashes script or CSS bytes and prints an integrity attribute (sha256/384/512).

How to use it

Paste script/style source or drop a file.
Pick SHA-256, SHA-384, or SHA-512.
Copy the integrity attribute. Hashing is local.

When to use it

Subresource Integrity pins a CDN file to a digest. Hash the file you intend to serve, locally.

In this family

Hash & security — related tools in the same cluster.

Frequently asked questions

Are my files uploaded?

No. This tool runs in your browser. Files and text stay on your device and are not sent to our servers.

Does this use AI?

No. It is a deterministic utility. There is no model and no third-party processing of your data.