BLAKE3 hash generator
Hash text or files with BLAKE3 — the fast, modern hash — free and entirely in your browser. Nothing leaves your device.
the hash appears here — type above or drop a file
What makes BLAKE3 different
BLAKE3 (2020) is what a hash function looks like when it's designed for modern hardware from day one. It descends from BLAKE2 and the ChaCha cipher — lineages with a decade-plus of public analysis — and restructures the work as a Merkle tree: a big file is split into chunks that can be hashed on every CPU core simultaneously, then folded together. Add aggressive SIMD use and fewer rounds, and software BLAKE3 runs several times faster than SHA-256 — often faster than MD5, while being actually secure. In this page it runs single-threaded via WebAssembly, which is still brisk; the streaming design means a 10 GB file hashes in flat memory either way.
Security posture, plainly
No known practical attacks; a 256-bit digest (64 hex characters); a conservative core inherited from well-studied designs. What it doesn't have is a NIST standard behind it — so if your requirement says "FIPS-approved algorithms," BLAKE3 is out of scope regardless of merit. For integrity checking, content addressing, and any pipeline you control end-to-end, it's an entirely sound choice.
Where you'll see it
The b3sum command-line tool (the reference way to cross-check this page), content-addressed storage and file-sync systems, build caches, and projects that publish B3SUMS files alongside releases. That filename is the giveaway when you're staring at an unlabelled 64-character hash — otherwise it's indistinguishable from SHA-256 by eye, as the hash identifier will honestly tell you.
Using it for your own releases
The batch tool hashes a folder's worth of files and exports a ready-to-publish sums file; pair a B3SUMS with a conventional SHA256SUMS so every consumer has an option they trust. To check a single file someone else published, the verify tool compares it in one step.
questions
Is BLAKE3 secure?
Yes, for integrity and general-purpose hashing. It's built from the heavily analyzed BLAKE2 and ChaCha designs, produces a 256-bit output, and has no known practical attacks. What it lacks is a NIST stamp — which matters for compliance checklists, not for whether your checksum is trustworthy.
Why is BLAKE3 so fast?
Three reasons: fewer rounds than its ancestors, heavy use of SIMD instructions, and a Merkle-tree structure that lets it hash different parts of a file on different CPU cores at once. On typical hardware it's several times faster than SHA-256 in software — and an order of magnitude faster than MD5's design ever was, while staying secure.
Where is BLAKE3 used?
The b3sum command-line tool, content-addressed storage and sync systems, build tools and package managers that hash a lot of data. If a project publishes a B3SUMS file, it's this — 64 hex characters, same length as SHA-256.
Should I use BLAKE3 or SHA-256?
For verifying someone else's download, use whatever they published — usually SHA-256. For your own pipelines where you control both ends and hash gigabytes, BLAKE3's speed is hard to argue with. Security-wise, both are considered solid.
Does this page compute the full BLAKE3 or a shortcut?
The real thing: the standard 256-bit BLAKE3 digest, via WebAssembly, streamed in chunks so multi-gigabyte files hash without loading into memory. You can cross-check any value against b3sum on your machine.