Why does "BLAKE2" default to BLAKE2b specifically?

BLAKE2 actually comes in two variants tuned for different hardware: BLAKE2b (64-bit optimized, up to 512-bit output) and BLAKE2s (32-bit optimized, up to 256-bit output). BLAKE2b is the more commonly seen default in practice, it's what WireGuard uses for its handshake hashing and what Argon2 (the modern password-hashing winner) uses internally, so this tool defaults to it when someone just asks for "BLAKE2" without specifying which.

What's actually different between BLAKE2b and BLAKE2s?

Word size and target hardware: BLAKE2b operates on 64-bit words and is tuned for 64-bit desktop/server CPUs, producing up to a 512-bit digest, while BLAKE2s operates on 32-bit words and is tuned for smaller or embedded 32-bit platforms, producing up to a 256-bit digest. Both share the same overall ChaCha-based design and security properties, just at different internal word widths.

Is BLAKE2 faster than MD5 or SHA-256?

Yes, that was one of BLAKE2's explicit design goals: it's typically faster than MD5 in software despite being a modern, cryptographically strong design with no known practical attacks, and it generally outperforms SHA-2 as well on typical 64-bit hardware. That combination of speed and strength is exactly why WireGuard and Argon2 chose it.

Does this tool send my text to a server?

No. The BLAKE2b digest is computed entirely in your browser using @noble/hashes, an audited JavaScript library, so nothing you type here is transmitted anywhere.

BLAKE2 Hash Calculator - BLAKE2b Default Digest Online

Overview

Introduction

"BLAKE2" isn't quite one algorithm, it's two closely related variants tuned for different hardware, and most of the time when someone says "BLAKE2" without qualification, they mean BLAKE2b.

This tool computes that default, BLAKE2b, for any text you provide, entirely in your browser; dedicated tools elsewhere in this category cover BLAKE2b and BLAKE2s specifically if you need to be explicit about which.

What Is BLAKE2 Hash Calculator?

BLAKE2 is a 2012 cryptographic hash function family designed by Aumasson, Neves, Wilcox-O'Hearn, and Winnerlein, built directly on the original BLAKE's design but retuned for speed, standardized in RFC 7693.

It splits into BLAKE2b (64-bit words, up to 512-bit output, tuned for 64-bit platforms) and BLAKE2s (32-bit words, up to 256-bit output, tuned for smaller or embedded platforms); this tool computes BLAKE2b, the more commonly used general-purpose default.

How BLAKE2 Hash Calculator Works

Your UTF-8 text is processed through BLAKE2b's ChaCha-inspired compression function, operating on 64-bit words across a 128-byte block size, with fewer rounds than the original BLAKE for improved software speed.

The resulting 512-bit state is hex-encoded into the 128-character digest this tool returns, identical in algorithm to this category's dedicated BLAKE2b tool.

When To Use BLAKE2 Hash Calculator

Use BLAKE2 (BLAKE2b) as a fast, modern, general-purpose hash for checksums, deduplication, or any non-password hashing need where you want speed without sacrificing cryptographic strength.

If you specifically need the 32-bit-tuned BLAKE2s variant, or a particular truncated output length, use this category's dedicated BLAKE2b or BLAKE2s tools instead of this family-default view.

Often used alongside BLAKE2b Hash Calculator, BLAKE2s Hash Calculator and BLAKE3 Hash Calculator.

Features

Advantages

Faster than MD5 and SHA-2 in typical software implementations, with no known practical attacks against the full algorithm.
Proven in demanding real-world use: WireGuard's handshake protocol and Argon2's internal hashing both rely on BLAKE2b.
Simple, RFC-standardized design (RFC 7693) with strong library support across languages.

Limitations

"BLAKE2" alone is ambiguous between BLAKE2b and BLAKE2s; always confirm which variant a spec or system actually expects.
BLAKE3 (2020) is faster still and natively parallelizable, worth considering for new high-throughput designs.
Less universally recognized by name than MD5/SHA-256 in older tooling and documentation, despite being the technically stronger and faster choice.

Examples

Hashing a short greeting

Input

Hello, world!

Output

a2764d133a16816b5847a737a786f2ece4c148095c5faa73e24b4cc5d666c3e45ec271504e14dc6127ddfce4e144fb23b91a6f7b04b53d695502290722953b0f

13 bytes of UTF-8 text produce the full 128-character BLAKE2b hex digest (512-bit output), identical to this category's dedicated BLAKE2b tool since this is simply BLAKE2b under the "BLAKE2" default name.

Best Practices & Notes

Best Practices

When documenting a hash choice, write "BLAKE2b" or "BLAKE2s" explicitly rather than just "BLAKE2" to avoid the same ambiguity this tool's default resolves for you.
Prefer BLAKE2b for 64-bit server/desktop contexts and BLAKE2s for constrained 32-bit or embedded targets.
Consider BLAKE3 instead for new high-throughput designs that can benefit from its native parallelism.

Developer Notes

This tool adds no new hashing logic: it directly re-exports this category's existing calculateBlake2bHash function (backed by @noble/hashes), so its output is byte-for-byte identical to the dedicated BLAKE2b Hash Calculator tool. It exists purely to answer the ambiguous "just give me BLAKE2" request with a sensible, clearly explained default.

BLAKE2 Hash Calculator Use Cases

Getting a fast, modern general-purpose hash without first deciding between BLAKE2b and BLAKE2s
Reproducing WireGuard- or Argon2-adjacent BLAKE2b values by hand
Comparing BLAKE2's speed and output against MD5/SHA-2 for the same input
Learning the BLAKE2 family before diving into its specific b/s variants

Common Mistakes

Assuming "BLAKE2" always means BLAKE2b; some systems and specs specifically mean BLAKE2s, and the two produce different digests.
Confusing BLAKE2 with the original BLAKE or with BLAKE3; all three are related but produce different output for the same input.
Using BLAKE2 for password storage; despite being fast and strong, it's a general-purpose hash, not a slow, memory-hard password KDF like the Argon2 that happens to use it internally.

Tips

Need the 32-bit-tuned variant specifically? Use the dedicated BLAKE2s Hash Calculator instead.
For maximum modern speed with native parallelism, try this category's BLAKE3 Hash Calculator.

BLAKE2 Hash Calculator