Is my text transmitted over the internet to generate the hash?

Never—hashes are computed locally via window.crypto.subtle.

Can a SHA-256 hash be reversed?

No, SHA-256 is a one-way cryptographic hash function.

100% Client-Side • Zero Data Leaves Browser

Compute SHA-1, SHA-256, and SHA-512 checksum hashes locally using the browser's native Web Crypto API.

Active Converter / Utility

Input Data Upload File

Output Result