About SHA-256

SHA-256 is the workhorse of the SHA-2 family — a 256-bit digest with no practical attacks. It's the default choice for integrity checks, signatures, content addressing, and most things labeled "checksum" today.

Digests here are computed with the browser's WebCrypto API (MD5 runs locally in JavaScript, since WebCrypto dropped it). A hash is one-way: the same input always produces the same 256-bit digest, but the digest can't be reversed back into the input. Text you enter never leaves the page.