File Hash Checker
Compute SHA-256, SHA-1, and SHA-512 hashes of any local file and compare against a published checksum, entirely in your browser.
Select File
Frequently Asked Questions
Is my data sent to a server when using the File Hash Checker?
No. The File Hash Checker is a fully client-side utility. All data processing, calculations, and conversions are handled locally in your browser. No input text, payloads, or keys are uploaded to any external server.
Why would I verify a file's hash?
Comparing a file's computed hash against a checksum published by the source confirms the download wasn't corrupted in transit and hasn't been tampered with. This is a common step when installing software, ISOs, or packages from third-party mirrors.
Does the file ever leave my browser?
No. The selected file is read locally with the File API and passed directly to the browser's built-in Web Crypto API for hashing. It is never uploaded, transmitted, or stored anywhere outside your session.
Is there a file size limit?
The tool itself imposes no file size limit. Very large files may simply take longer to hash, since the hashing runs synchronously against the file's full contents in your browser.
Does the File Hash Checker store history or cache my inputs?
No. The application runs entirely in browser memory. Once you refresh the tab, navigate away, or close the window, all inputted details, logs, and outputs are completely cleared.
Is the File Hash Checker compatible with mobile devices?
Yes. The interface is optimized to be fully responsive. You can perform calculations, conversions, and formats on all modern mobile, tablet, and desktop web browsers.
Does the File Hash Checker work offline?
Yes. Once loaded, all code and assets required to run the File Hash Checker reside in your browser cache, enabling offline use without an active network connection.