BLAKE3 Hash Generator
Generate BLAKE3 cryptographic hash digests from text or hex. Supports keyed hashing mode.
What is BLAKE3?
BLAKE3 is a cryptographic hash function that is faster than MD5, SHA-1, SHA-2, and SHA-3, while being more secure than MD5 and SHA-1. It was designed by Jack O'Connor, Jean-Philippe Aumasson, Samuel Neves, and Zooko Wilcox-O'Hearn, and it descends from the earlier BLAKE and BLAKE2 families that competed in the SHA-3 selection process.
BLAKE3 is built on a Merkle tree: the input is split into 64-byte chunks that are hashed independently and then combined in a binary tree. Because each chunk stands alone, the algorithm can use SIMD instructions and multiple CPU threads in parallel, which is why it dramatically outperforms single-threaded SHA-2 hashing on large inputs.
Beyond raw speed, BLAKE3 is unusually versatile. One core function serves several jobs: plain hashing, keyed hashing (a pseudo-random function), key derivation, and extendable output. That means you can use the same primitive for integrity checks, message authentication, and streaming verification instead of reaching for a different algorithm each time.
Key properties
- Very fast — commonly reported as several times faster than SHA-256 and faster than SHA-3 in software.
- Parallel by design — the Merkle-tree structure lets independent chunks be processed on separate cores.
- Extendable output (XOF) — you can request any digest length instead of being locked to 256 or 512 bits.
- Keyed mode — a secret 32-byte key turns the hash into a message authentication code.
- Incremental updates — you can feed data in pieces without keeping the whole input in memory.
- 128-bit security — at the default 256-bit output BLAKE3 targets roughly 128 bits of collision resistance.
How BLAKE3 compares
| Algorithm | Digest size | Parallel | Extendable output |
|---|---|---|---|
| MD5 | 128-bit | No | No |
| SHA-1 | 160-bit | No | No |
| SHA-256 | 256-bit | No | No |
| SHA-512 | 512-bit | No | No |
| SHA-3 | 224–512-bit | No | Limited |
| BLAKE3 | Any (default 256-bit) | Yes | Yes |
This table compares general design traits of each family. For a given security level, always follow current guidance rather than treating older algorithms as equivalent.
How to Use
- Enter Text — Type or paste the text you want to hash in the input area. You can also switch to hex input format.
- Configure Output — Select the output length in bytes (32 = 256-bit default, 64 = 512-bit, or shorter).
- Enable Keyed Mode (optional) — Check "Enable keyed hashing" and provide a 32-byte hex key for authenticated hashing (PRF mode).
- Generate — Click "Generate Hash" or use the example button to see BLAKE3 in action.
- Copy Results — Copy the hex hash or Base64 representation using the copy buttons.
When to use BLAKE3
BLAKE3 is a good fit wherever you need a modern hash that is both fast and secure. Typical uses include:
- File integrity and checksums — generate a digest to confirm a download or a backup copy is unchanged.
- Content addressing — derive stable identifiers for blobs in a cache or a storage system, the way a Merkle tree does.
- Keyed message authentication — use keyed mode as a MAC to verify that a message came from someone holding the same key.
- Key derivation — BLAKE3 can expand a secret into derived keys for multiple purposes.
- Real-time pipelines — its throughput makes it practical for validating streaming data as it arrives.
For password storage, use a dedicated password hashing function such as bcrypt, scrypt, or Argon2 rather than a general-purpose hash like BLAKE3.
Frequently Asked Questions
How does BLAKE3 compare to SHA-256?
BLAKE3 is considerably faster than SHA-256 on large inputs, supports parallel hashing via SIMD and multiple threads, and targets the same 256-bit output size and roughly 128-bit security level. Unlike SHA-256, BLAKE3 also offers keyed hashing and extendable output.
What is keyed hashing mode?
Keyed hashing mode (a PRF — pseudo-random function) mixes a secret key with the input to produce the digest. It is useful for message authentication, because only someone holding the same key can reproduce or verify the hash. BLAKE3 keyed mode uses a 32-byte (256-bit) key.
What output lengths are supported?
As an extendable-output function BLAKE3 can produce any length from 1 byte up to 2^64-1 bytes. This tool offers the common choices of 32 bytes (256-bit default), 64 bytes (512-bit), 16 bytes (128-bit), and 8 bytes (64-bit).
Why is BLAKE3 so fast?
BLAKE3 splits input into 64-byte chunks and hashes them as the leaves of a Merkle tree. Because the chunks are independent, they can be processed in parallel using SIMD instructions and multiple CPU cores, unlike the strictly sequential design of SHA-2.
Can I use BLAKE3 for passwords?
No. BLAKE3 is a general-purpose hash and is deliberately fast, which makes brute-force guessing cheap. Store passwords with a purpose-built, slow function such as bcrypt, scrypt, or Argon2 instead.
What is the difference between hex and Base64 output?
They are two encodings of the same raw digest bytes. Hexadecimal is convenient for comparing digests by eye and appears in most documentation, while Base64 is shorter and is common in HTTP headers and structured tokens.
Is BLAKE3 suitable for digital signatures?
Hashes are usually combined with a signature scheme rather than used alone. BLAKE3 can serve as the hash inside a signature or MAC construction, but the security of the overall system depends on the signature algorithm and key management, not the hash alone.
Is my data stored or uploaded?
No. The entire computation runs in your browser in JavaScript. Your input, key, and resulting digest never leave your device, so the tool is safe for sensitive text.