BLAKE2s Hash Generator

What is BLAKE2s?

BLAKE2s is the small-platform member of the BLAKE2 family, producing 1 to 32 bytes. The default is 32 bytes, the standard BLAKE2s-256 result.

BLAKE2s options

Data

Type text or upload files. Text can be up to 100 MiB, read as UTF-8, and each file up to 2 GiB. Every input is hashed on its own.

Digest length

256-bit (the default), 160-bit or 128-bit, or type 1 to 32 for a custom byte length.

Output

The raw digest bytes and the lowercase hexadecimal form.

Why choose BLAKE2s over BLAKE2b

BLAKE2s uses 32-bit words and a smaller internal state, which is what makes it the right pick for 32-bit processors, microcontrollers and constrained environments. On 64-bit hardware, BLAKE2b will be faster and can produce longer digests, so the choice is usually decided by the platform or by whatever you are matching.

If neither constrains you and the data is large, BLAKE3 outruns both.

BLAKE2s alternatives

BLAKE2b is the 64-bit counterpart with output up to 64 bytes. BLAKE3 replaces the family for new designs. SHA-256 gives the same 32-byte size with far broader support.

Keyed authentication that other tools can check belongs with HMAC Generator.

Things to know about BLAKE2s

As with BLAKE2b, the output length is part of the calculation rather than a truncation. A 16-byte BLAKE2s digest is not the first half of the 32-byte one, so the length has to match what the other side expects or nothing will line up.

Shorter output also means weaker collision and preimage resistance. Sixteen bytes makes a compact identifier, not a security guarantee, so treat the smaller lengths as a way to fit a field rather than a way to save space.