File to BLAKE3.

BLAKE3 is the 2020 successor to BLAKE2 by O'Connor, Aumasson, Neves and Wilcox-O'Hearn. It cuts the input into 1 KB chunks, hashes them as a Merkle tree with a 7-round compression function, and gives a 256-bit digest by default that can be extended to any length. One algorithm covers hashing, keyed hashing and key derivation.

The tree. Chunks are independent, so SIMD lanes and CPU cores hash them in parallel, and the result is the same whichever way the work was split. Single-threaded with AVX2 it runs several gigabytes a second, several times SHA-256's software speed; with all cores it is limited by memory bandwidth. Short inputs are fast too, since the tree collapses to one chunk.

Yes. It keeps BLAKE2's compression function with fewer rounds, a margin the designers justified from a decade of cryptanalysis on BLAKE and BLAKE2, and the tree mode is a proven construction. It offers 128-bit security against every attack, immune to length extension, with no published weakness.

b3sum as a drop-in for sha256sum, content-addressed stores and sync tools (Iroh and the Bao verified-streaming format are built on it), deduplication, and anywhere large files are hashed often. It is not in FIPS, so regulated systems still use SHA-2 or SHA-3.

Yes, with a 256-bit key: the key replaces the standard starting values and the result is a MAC as fast as the hash. Generic HMAC over BLAKE3 also works and is what this tool's HMAC toggle computes, so the value matches a standard HMAC library rather than BLAKE3's own keyed mode.

Nothing leaves your browser. The file is read on your machine and hashed there, by the browser's Web Crypto API or a WebAssembly build of BLAKE3 loaded on first use; the page makes no request with its bytes. You can load the page, go offline and keep hashing.

Drop the file onto the pane or choose it with the button. It is read into memory and hashed at once, with no size steps and no upload progress because there is no upload. Files up to 1 GB work; a 100 MB file takes well under a second on BLAKE3.

Paste the digest the publisher gave you into the Verify field, in hex of either case, with or without spaces, colons or a 0x prefix, or in Base64. The tool says whether it matches the file you dropped. A match means the bytes are exactly the ones that were published.

Hex by default, 64 characters; Base64 and Base64url are one click away and re-encode the same 32 bytes. The download button saves a line in the `digest filename` form that sha256sum-style tools read.

Yes: turn on HMAC and enter the secret, and the file is signed with HMAC-BLAKE3 rather than hashed, the same construction a server uses to sign an upload or a webhook payload.

No. The "File to BLAKE3" tool is free and opens without a sign-in, an account or an install.

Nothing. The "File to BLAKE3" tool 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 BLAKE2b and BLAKE2s without leaving the page. Each one reads the same input, so you can compare digests side by side.

BLAKE3 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 BLAKE3 hash generator page has the same algorithms and options and opens on the text box. This page opens on the file pane.

Not on its own. BLAKE3 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 "File to BLAKE3" tool: BLAKE3 hash generator, BLAKE2b hash generator, SHA-256 hash generator, xxHash3 hash generator. Each opens on its own page, free and in the browser.

The "File to BLAKE3" tool 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.