BLAKE2b hash generator.

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.

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.

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.

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.

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 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.

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.

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.

No. The BLAKE2b hash generator is free and opens without a sign-in, an account or an install.

Nothing. The BLAKE2b hash generator holds your input in the page's memory, so closing or reloading the tab clears it, and it saves nothing in this browser.

The toolbar switches to BLAKE2s and BLAKE3 without leaving the page. Each one reads the same input, so you can compare digests side by side.

BLAKE2b is computed by a WebAssembly build from the hash-wasm library, which the page loads the first time you hash something and reuses after that.

Yes: the File to BLAKE2b page has the same algorithms and options and opens on the file pane. Files are read in your browser and never uploaded.

Not on its own. BLAKE2b is built to be fast, and fast hashes are cheap for an attacker to guess against. Passwords need a salted, deliberately slow hash: use Argon2id, Argon2d, and bcrypt from the hash generators, which draw a fresh random salt each time.

Closest to the BLAKE2b hash generator: File to BLAKE2b, BLAKE3 hash generator, BLAKE2s hash generator, SHA-512 hash generator. Each opens on its own page, free and in the browser.

The BLAKE2b hash generator is one of 64 in its group. The group's page, /tools/hash, lists them all.

The tool is free. Its interface is built from shadcn.io's own components (Button, Input, Slider and the rest of the registry under /ui), which come in React, Vue, Svelte and Solid. Pro adds the blocks and templates for the product around it.