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BLAKE2b Hash

Generate a BLAKE2b hash from any text instantly. Everything is computed in your browser, so your input never leaves your device.

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What is BLAKE2b?

BLAKE2b is a modern cryptographic hash function from the BLAKE family that produces variable-length digests (1 to 64 bytes, commonly 256, 384, or 512 bits) and is standardized in RFC 7693. The algorithm offers security equivalent to SHA-3 while being significantly faster on 64-bit processors, processing at approximately 1 GB per second. This free online BLAKE2b generator runs entirely in your browser without uploading any data, allowing you to generate cryptographic hashes instantly for any text input with full privacy and no account required.

How BLAKE2b works

How BLAKE2b Hashing Works

BLAKE2b is a cryptographic hash function that takes an input of any size and processes it through 12 rounds of mathematical transformations using a 64-bit word structure. The algorithm produces a fixed-length digest (the hash) where even a tiny change in the input produces a completely different hash output. This one-way process means you cannot reverse the hash back to the original input.

Basic Process:

  1. The input data is padded to fill the required block size
  2. Data is processed through 12 compression rounds using bitwise operations and additions
  3. Each round mixes the data with internal state variables and constants
  4. The final state is converted to hexadecimal format as the hash output

Worked Example:

If you hash the text "hello" using BLAKE2b-512 (512-bit output), the algorithm processes this 5-character input through its rounds and produces a 128-character hexadecimal digest. If you hash "hello " (with a space), the output is completely different. This sensitivity ensures data integrity—even one bit changed in the input produces an unrecognizable hash.

How to use

  1. Type or paste your text into the input box.
  2. The BLAKE2b hash is calculated automatically as you type.
  3. Choose your output encoding (Hex or Base64) if needed.
  4. Click Copy to copy the digest to your clipboard.

Common uses

  • File integrity verification: Ensure downloaded files match their original version by comparing hash checksums before and after transfer
  • Data deduplication: Identify duplicate data blocks in storage systems using hash matching to reduce disk space requirements
  • Blockchain and cryptocurrency: Zcash and other digital currency systems use BLAKE2b for transaction hashing and security
  • Digital signatures and authentication: Sign data with BLAKE2b to create tamper-evident records proving authenticity
  • Cloud storage validation: Verify file integrity across cloud systems without re-downloading full file contents
  • Content addressing: Build content-based storage systems where data is located using its BLAKE2b hash rather than file paths

Frequently asked questions

Is BLAKE2b secure?
Yes. BLAKE2b is based on BLAKE, a SHA-3 competition finalist, and provides security equivalent to SHA-3. It has undergone extensive cryptanalysis and is standardized in RFC 7693.
Can you reverse a BLAKE2b hash back to the original input?
No. BLAKE2b is a one-way cryptographic function—it is mathematically infeasible to reverse the hash back to the input data. This is by design.
What output sizes does BLAKE2b support?
BLAKE2b produces variable-length digests from 1 to 64 bytes. Common lengths are 256 bits (32 bytes), 384 bits (48 bytes), and 512 bits (64 bytes).
Should I use BLAKE2b for password hashing?
No. Use dedicated password hashing algorithms like Argon2, bcrypt, or PBKDF2 instead. These are specifically designed to be slow and resistant to brute-force attacks, while BLAKE2b is optimized for speed.
Is my data private when I use this tool?
Yes. This tool runs entirely in your browser with no data uploaded to servers. All hashing happens locally on your device—nothing is transmitted or stored.
How fast is BLAKE2b compared to other hashes?
BLAKE2b is 2-3 times faster than SHA-256 and faster than MD5, SHA-1, SHA-2, and SHA-3 on modern 64-bit processors while maintaining stronger or equivalent security.