About SHA-384

SHA-384 is SHA-512 truncated to 384 bits with different initial values, which also makes it immune to length-extension attacks. It's common in TLS certificate chains and anywhere a middle ground between SHA-256 and SHA-512 is wanted.

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 384-bit digest, but the digest can't be reversed back into the input. Text you enter never leaves the page.