BLAKE2b-256 Hash — Faster Than MD5, Secure as SHA-3
High-speed cryptographic hash optimized for 64-bit platforms, 256-bit output. Faster than MD5 yet as secure as SHA-3. Adopted by Zcash and Decred blockchains.
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
- ✓100% browser-based with WebAssembly-powered high-speed hashing
- ✓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
- ✓Cross-platform accessibility — compute hashes on any browser-enabled device without installing software
- ✓Session history — previous computation results retained for reference and re-verification
How to Use
- 1Type or paste your text into the input box above.
- 2Your hash digest appears instantly — no page reload needed.
- 3Toggle UPPERCASE / lowercase to change the hex output format.
- 4Click the copy icon to copy the hash to clipboard, or use Save to save as .txt.
- 5Paste an expected hash into the Verify field to check for a match.
- 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.
- 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.
- 8How to generate hashes for API authentication: hash API keys with BLAKE2b-256 to produce a fixed-length digest for secure storage and validation.
- 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.
- 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.
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.
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)?
∨
Yes. BLAKE2b natively supports keyed hashing, allowing it to function as a Message Authentication Code (MAC) without needing a separate HMAC construction. This is more efficient than HMAC-SHA-256 for authenticated communication.
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.
Related Tools
BLAKE2b-512 Hash — 512-bit High-Speed BLAKE2 Hash Online
Full 512-bit BLAKE2b output with SHA-512 equivalent security. Runs faster than MD5 on 64-bit CPUs — roughly 3x faster than SHA-512.
BLAKE3 Hash — Fastest Merkle Tree Hash (10x SHA-256)
Next-gen hash algorithm with Merkle tree architecture for full multithreading. 256-bit output, up to 10x faster than SHA-256 on modern multi-core CPUs.
SHA-256 Hash Calculator — Bitcoin & HTTPS Standard Hash
Global industry standard powering Bitcoin and HTTPS certificates. 256-bit output with 128-bit security. The most trusted SHA-2 variant.