BLAKE3 Hash Generator

What is BLAKE3?

BLAKE3 is a modern cryptographic hash built for speed. It returns 32 bytes by default and can produce any length from 1 through 1,048,576 bytes without switching to a different algorithm.

Run typed text or uploaded files through it. Leave the key field empty for ordinary hashing. For keyed hashing, supply a secret key of exactly 32 bytes; any other non-empty length is rejected. Results include the raw digest and lowercase hexadecimal.

Why it is so much faster

BLAKE3 splits the input into chunks and hashes them as a tree rather than a single chain. Independent branches mean the work parallelises across cores and SIMD instructions, so throughput scales with the hardware instead of being pinned to one sequential pass.

For large files the gap against SHA-256 is not marginal. If you are fingerprinting build artifacts, deduplicating storage, or checksumming anything sizable, this is the fastest cryptographic option in the set.

Are there alternatives?

SHA256 is slower but universally supported, which matters when another system has to verify your digest. BLAKE2b is the previous generation of the same lineage and still quick. SHAKE Hash also offers extendable output, from the SHA-3 standard.

Keyed BLAKE3 authenticates data, but for interoperability with anything expecting a standard MAC, use HMAC Generator. Passwords belong with Argon2id Hash Generator: BLAKE3 is fast, and for password hashing fast is precisely wrong.

Fun facts and more info

The same input, key, and output length always produce the same result, and extending the output does not disturb the bytes already produced.

Hashing runs one way and is not encryption, so the digest cannot be turned back into the input.

Keyed mode is a different operation from plain hashing rather than an add-on to it: the same data hashed with and without a key produces completely unrelated output, and the keyed result authenticates data only for as long as the key stays secret.