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BLAKE2b-256 Hash: Faster Than MD5, Secure as SHA-3

BLAKE2b-256 hash calculator online: compute 256-bit hashes faster than MD5 with SHA-3 level security, optimized for 64-bit platforms.

Updated 2026-08-16

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Features

  • Compute BLAKE2b-256 hashes online: faster than MD5, secure as SHA-3
  • Real-time 256-bit hash computation with 64 hex character output
  • One-click copy, save as .txt, and uppercase/lowercase toggle
  • Optimized for 64-bit platforms: adopted by Zcash and Decred blockchains
  • Hash verification against known BLAKE2b-256 checksums
  • Fast in-browser hashing: pure JavaScript implementation, results in milliseconds
  • Hash comparison tool: paste an expected hash alongside new output to instantly verify integrity with visual match/mismatch indicators
  • Real-time input length display: shows character and byte counts alongside the hash for complete data awareness
  • Compute hashes on any device including mobile phones and tablets
  • Session history: previous computation results retained for reference and re-verification

How to Use

  1. 1Type or paste your text into the input box above.
  2. 2Your hash digest appears instantly; no page reload needed.
  3. 3Toggle UPPERCASE / lowercase to change the hex output format.
  4. 4Click the copy icon to copy the hash to clipboard, or use Save to save as .txt.
  5. 5Paste an expected hash into the Verify field to check for a match.
  6. 6How to verify a cryptocurrency-related checksum: paste the expected BLAKE2b-256 hash from a blockchain explorer into the Verify field, then compute the hash of your transaction data to confirm integrity.
  7. 7How to use BLAKE2b-256 for file integrity verification: compute the hash of the original data, store it securely. When you need to verify, recompute the hash and compare against the stored value.
  8. 8How to generate hashes for API authentication: hash API keys with BLAKE2b-256 to produce a fixed-length digest for secure storage and validation.
  9. 9How to compare two data sets: hash each data set separately using the tool, then compare the resulting 64-character hex strings. Identical strings mean identical data.
  10. 10How to format hash output for documentation: toggle uppercase/lowercase to match your project's coding standards, then use the copy button to paste the hash into your code or documentation.

Frequently Asked Questions

What is BLAKE2b-256?

BLAKE2b-256 is a cryptographic hash producing 256-bit output, optimized for 64-bit platforms. Designed as an improvement of BLAKE (SHA-3 finalist), it is faster than MD5 while providing SHA-3 level security. (See: RFC 7693)

Why is BLAKE2b-256 faster than MD5?

BLAKE2b was designed for modern CPUs with SIMD and efficient 64-bit arithmetic. MD5 was designed in 1992 for 32-bit machines. BLAKE2b processes larger chunks with fewer rounds.

BLAKE2b-256 vs SHA-256?

BLAKE2b-256 is 2-3x faster on 64-bit CPUs with identical 128-bit security. SHA-256 has wider ecosystem support and hardware acceleration. Choose BLAKE2b for performance, SHA-256 for compatibility.

Which cryptocurrencies use BLAKE2b?

Zcash uses BLAKE2b for Equihash proof-of-work. Decred uses BLAKE2b-256. Siacoin and other blockchain projects adopted it for speed and security.

Can BLAKE2b-256 replace SHA-256 everywhere?

Technically yes, practically no. SHA-256 is mandated by many standards. BLAKE2b is ideal for new systems where you control the full stack and performance matters.

How many hex characters does BLAKE2b-256 produce?

BLAKE2b-256 produces a 256-bit hash displayed as 64 hexadecimal characters. Each pair of hex characters represents one byte of the hash. (See: RFC 7693)

Is BLAKE2b-256 quantum-resistant?

Like all symmetric cryptographic primitives, BLAKE2b-256 is affected by Grover's algorithm, which would reduce its 128-bit security to roughly 64 bits against a quantum adversary. For post-quantum applications, use larger output sizes (256-bit+ effective security).

What is the difference between BLAKE2b and BLAKE2s?

BLAKE2b is optimized for 64-bit platforms using 64-bit arithmetic. BLAKE2s is optimized for 8-32-bit platforms using 32-bit arithmetic. BLAKE2b-256 and BLAKE2s-256 produce different hashes for the same input.

Can I use BLAKE2b-256 for password hashing?

While BLAKE2b-256 is a cryptographic hash, it is not ideal for password storage; it is designed to be fast. For passwords, use bcrypt, Argon2id, or scrypt which are deliberately slow. BLAKE2b-256 is better suited for data integrity and digital signatures.

Why was BLAKE2 created?

BLAKE2 was created as an improved version of BLAKE (SHA-3 finalist). It simplifies the design, increases speed, and removes unnecessary features while maintaining the same security level. BLAKE2b-256 achieves higher performance than MD5 with SHA-3 grade security.

Does BLAKE2b-256 support keyed hashing (MAC)?

The algorithm itself supports keyed hashing, but this page's HMAC mode is disabled for BLAKE2b-256, so the HMAC toggle stays off for this variant. For keyed BLAKE2b-256 (MAC), use a dedicated library: Python's hashlib.blake2b(key=...), Node's blake2 npm package, or Go's golang.org/x/crypto/blake2b.

What real-world systems use BLAKE2b-256?

Beyond Zcash and Decred, BLAKE2b is used in the Linux kernel's cryptographic API, OpenSSL (since version 1.1.1), and various blockchain wallets for address generation and transaction signing.

Is BLAKE2b-256 suitable for long-term archiving?

Yes. With 128-bit collision security, BLAKE2b-256 is suitable for long-term data preservation. Its high speed makes it practical for hashing large archival datasets without creating a processing bottleneck.

Can I verify a downloaded file or hard disk image with this tool?

Not directly. This tool hashes text input only, so it cannot read file bytes. For files and disk images, use a command-line tool: b2sum <file> on Linux/macOS, or openssl dgst -blake2b256 <file> on Windows. The concept is identical (same algorithm, same 64-character output); only the input source differs.

My hash doesn't match the one on the download page: what is different?

Hashing is byte-exact: a trailing newline, an extra space, or a different encoding (UTF-8 vs UTF-16) produces a completely different digest. If you pasted file content into the text box, the copy may have added or stripped characters. Always hash the file itself with b2sum instead of pasting its text, and compare the full 64 characters; a single mismatched digit means the data differs.