SHA-256 File Checksum

Calculate a SHA-256 fingerprint of a file locally using Web Crypto.

How to use

1. Select a file and press Calculate checksum.
2. Compare the 64-character hexadecimal digest with a trusted checksum from its publisher.

About these formats

A checksum verifies that bytes match an expected reference, but does not by itself establish who published that reference.

Browser limitations

Web Crypto digest buffers the file in memory; very large files may exceed available memory.

Frequently asked questions

Is SHA-256 encryption?

No. It is a one-way cryptographic digest.

Is the hash shared with LHTSOFT?

No, the hash is calculated entirely in your browser.

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