BLAKE2b is the 64-bit flavour of BLAKE2, the hash Aumasson, Neves, Wilcox-O'Hearn and Winnerlein published in 2012 and the IETF documented in RFC 7693. It gives up to 512 bits (this tool uses the full 64 bytes), has a built-in keyed mode, and is faster than MD5 and SHA-1 on a 64-bit CPU while being as secure as SHA-3.

Yes. BLAKE2 was designed in 2012 from BLAKE, a SHA-3 finalist that received years of cryptanalysis without a practical attack. The best published results reach only a fraction of its rounds. BLAKE2 is in RFC 7693, in libsodium as the generic hash, in Argon2 and in WireGuard, and no attack on the full function is known.

Where is BLAKE2b used?

Argon2 builds its memory filling on BLAKE2b; libsodium's crypto_generichash is BLAKE2b; Zcash uses BLAKE2b-256 in its proofs; GNU coreutils ships b2sum beside sha256sum; and IPFS and many content stores accept it as a multihash. It is the quiet workhorse of modern software.

BLAKE2b runs on 64-bit words with 12 rounds and produces up to 64 bytes; BLAKE2s runs on 32-bit words with 10 rounds and produces up to 32 bytes. Pick BLAKE2b on servers and desktops, BLAKE2s on microcontrollers and in protocols sized for it, such as WireGuard.

What about keyed BLAKE2b and HMAC?

BLAKE2 has a keyed mode of its own (the key goes into the first block), which is simpler and faster than wrapping it in HMAC. This tool's HMAC toggle uses the standard HMAC construction so the value matches what generic HMAC libraries produce; a BLAKE2 native keyed hash is a different value.

Is my text or file uploaded anywhere?

Nothing leaves your browser. The hash is computed on your machine, by the browser's Web Crypto API or a WebAssembly build of the algorithm loaded on first use, and the page makes no request with your input. You can load the page, go offline and keep hashing.

How do I get the BLAKE2b of a file?

Drop the file onto the input or choose it with the button, and the tool reads it in your browser and hashes the bytes. Files up to 1 GB work; past that the browser would need the whole file in memory, so the tool declines. Paste the published digest into the Verify field to compare.

Hex, Base64 or Base64url: which should I use?

Hex is the common form: 128 characters from 0 to 9 and a to f, the same value in upper or lower case. Base64 writes the same 64 bytes in fewer characters, and Base64url swaps + and / for - and _ with no padding. Switch the output and the digest is re-encoded, not recomputed.

Why does my digest differ from the command line?

Text is hashed as UTF-8 bytes, which is what every language and command line does by default. A trailing newline changes the digest, so `echo -n` or this tool's input, with no newline added, matches a command-line tool run on a file without one.

How do I compute an HMAC-BLAKE2b?

Turn on HMAC and enter the secret: the tool computes HMAC-BLAKE2b over the input with that key, the standard RFC 2104 construction, so the value matches what a server-side HMAC library produces. The key is hashed as UTF-8 text.

BLAKE2b hash generator.

Paste text or drop a file and read its BLAKE2b digest as you type. BLAKE2b is the 64-bit BLAKE2, faster than MD5 and as secure as SHA-3, the hash inside Argon2 and libsodium; everything runs in your browser and nothing is uploaded.512 bits128 hex characters2012 published0 bytes uploaded

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How it works

4 steps, no account. It runs in your browser and nothing is uploaded.

Enter text or a file
Type or paste anything, or drop a file onto the input. The digest updates with every keystroke.
Pick the algorithm and format
BLAKE2b is the default; switch to BLAKE2s and BLAKE3, and read the digest as hex or Base64.
Key it, when you need a signature
Turn on HMAC and enter a secret to sign the input instead of hashing it.
Verify, copy or download
Paste a published digest to confirm a download, or copy and download your own.

BLAKE against the standards

BLAKE is the fast family. A SHA-3 finalist that lost on hardware cost and went on to win on software speed, twice.

BLAKE2b
512 bits by default, any length to 64 bytes. 64-bit words, 12 rounds. Faster than SHA-256 and MD5 on a 64-bit CPU. RFC 7693.
BLAKE2s
256 bits by default, any length to 32 bytes. 32-bit words, 10 rounds. The one for 32-bit and embedded chips; WireGuard uses it.
BLAKE3
256 bits by default, extendable. A Merkle tree of 1 KB chunks, 7 rounds, SIMD and multi-core: the fastest secure hash there is.
SHA-256
256 bits. The standard everything expects; with SHA extensions on the CPU it keeps up, without them BLAKE2b is faster.
SHA-512
512 bits. The same security as BLAKE2b and the same word size, around a third slower per byte in software.
SHA3-256
256 bits. BLAKE was a SHA-3 finalist; Keccak won on hardware cost, BLAKE2 and BLAKE3 win on software speed.
MD5
128 bits, broken. The usual reason people still reach for it is speed, and BLAKE3 is faster while still being secure.
xxHash3
64 bits, not cryptographic. Faster still, but offers no protection against anyone who wants a collision.

Nearby in the hash generators. Every one free, in the browser.

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BLAKE2b hash generator.