BLAKE2b Hash Generator & Verifier
Generate BLAKE2b hashes from text input and verify text against existing BLAKE2b hashes. BLAKE2b is a high-speed cryptographic hash function optimized for 64-bit platforms with variable output lengths up to 64 bytes.
Hash Generation Settings
BLAKE2b supports 1-64 bytes output length
Collision Resistance: 128 bits (constant)
Preimage Resistance: Up to 256 bits
Algorithm: Optimized for 64-bit platforms
Generated Hash
Generated hash will appear here
Enter text and click "Generate Hash" to start
About BLAKE2b
Optimized for 64-bit: Designed for modern 64-bit processors
High performance: Faster than SHA-256, SHA-512, and SHA-3
Cryptographically secure: 128-bit collision resistance (constant)
Flexible output: Variable output length from 1 to 64 bytes
Algorithm: Optimized variant of BLAKE2 for 64-bit platforms
Performance: Up to 3x faster than SHA-256 on 64-bit systems
Security: 128-bit collision resistance, up to 256-bit preimage resistance
Standard compliant: RFC 7693 standard implementation
About BLAKE2b Hash Generator & Verifier
The BLAKE2b Hash Generator & Verifier is a professional online tool that creates BLAKE2b hash values from any text input and verifies text against existing BLAKE2b hashes. BLAKE2b is a modern cryptographic hash function optimized for 64-bit systems, designed to provide excellent performance on modern processors while maintaining strong security properties. As a standardized implementation, it offers flexible configuration options and is well-suited for a wide range of cryptographic applications requiring both speed and reliability.
Why use a BLAKE2b Hash Generator & Verifier?
This tool provides access to BLAKE2b's modern design and excellent performance characteristics for 64-bit systems. BLAKE2b offers superior speed compared to traditional hash functions while maintaining strong cryptographic security. It's ideal for applications requiring efficient hashing operations, including file integrity verification, cryptographic protocols, and security applications where performance matters without compromising safety.
Who is it for?
Essential for software developers working on modern 64-bit systems, security professionals implementing cryptographic solutions, DevOps engineers, and anyone building applications requiring efficient, secure hashing. Perfect for developers working with data integrity systems, security protocols, and performance-critical applications where reliable hashing is important.
How to use the tool
Enter your text or data into the input field for hashing
Optionally adjust output length (1-64 bytes) based on your security requirements
Click generate to create a BLAKE2b hash with your specified parameters
For verification, input the original text and existing hash to confirm they match
Use for file checksums, data integrity verification, or as part of cryptographic protocols
Frequently Asked Questions
How do I generate a BLAKE2b hash?
Paste text or upload a file, pick your output length (1-64 bytes — most use 32 bytes for general hashing or 64 bytes for HMAC-style key derivation), and the tool computes the hash. BLAKE2b was published as RFC 7693 (2015) and is optimised for 64-bit platforms. Unlike SHA-2 which has fixed output lengths, BLAKE2b produces variable-length output that you specify. Optional features include built-in keyed mode (no HMAC wrapper needed), salt input, and personalization strings for domain separation. For non-keyed general-purpose hashing, just provide the input — the output is deterministic and one-way like any cryptographic hash.
BLAKE2b vs SHA-256 — which is faster?
BLAKE2b is significantly faster than SHA-256 on 64-bit CPUs — typically 1.5-3x faster depending on hardware and input size. The reason: BLAKE2b was designed in 2012 specifically for software performance on modern processors, while SHA-256 was designed in 2001 with hardware acceleration in mind (which never fully materialised for general computing). On hardware with SHA-NI / SHA extensions (Intel Ice Lake+, ARMv8.2+), SHA-256 closes the gap but BLAKE2b still wins in most benchmarks. On x86-64 without SHA-NI, BLAKE2b is dramatically faster. For high-throughput hashing where speed matters (content-addressed storage, large file integrity), BLAKE2b is the modern choice.
Is BLAKE2b secure?
Yes — BLAKE2b has no known cryptographic weaknesses and is used as a primitive inside the OWASP-recommended Argon2id password hash, the libsodium cryptographic library, and many modern systems. It's based on BLAKE (a SHA-3 competition finalist that lost the final round but is itself secure). RFC 7693 standardised BLAKE2b in 2015. The collision resistance is 2^256 for the full 512-bit output (2^128 for the 256-bit output) — equivalent to SHA-512 and SHA-256 respectively. If you trust Argon2id for password hashing — and you should, it's the OWASP 2024 default — you implicitly trust BLAKE2b for fast general-purpose hashing.
When should I use BLAKE2b?
Three primary use cases. First, high-throughput cryptographic hashing where SHA-256 is too slow (large file integrity, content-addressed storage like IPFS, blockchain alternatives to Bitcoin's SHA-256). Second, modern crypto library usage (libsodium uses BLAKE2b internally; if you're calling crypto_generichash, you're using BLAKE2b). Third, applications needing variable-length output without the awkwardness of truncating a fixed-length hash (use 16 bytes for compact identifiers, 32 bytes for general hashing, 64 bytes for HMAC-style key derivation). Avoid BLAKE2b for legacy interoperability — SHA-256 has broader library support across older platforms and protocols.
What's the difference between BLAKE2b, BLAKE2s, and BLAKE3?
BLAKE2b is optimised for 64-bit platforms; max output 64 bytes. BLAKE2s is the same algorithm tuned for 32-bit and embedded platforms; max output 32 bytes. BLAKE3 (2020) is a complete redesign: simpler API (no parameter selection), even faster than BLAKE2 on modern CPUs, parallelizable via tree-hashing, and supports arbitrary output length via XOF mode. BLAKE3 is the modern default for new applications wanting maximum speed; BLAKE2b remains the right choice when you need RFC 7693 compliance or are integrating with existing BLAKE2-based systems (Argon2id, libsodium). All three share the BLAKE design lineage and are considered cryptographically secure.
Does BLAKE2b have built-in keyed hashing?
Yes — BLAKE2b supports keyed mode natively, unlike SHA-2 which requires an HMAC wrapper to be used safely with a key. To use keyed mode, provide a key (up to 64 bytes) alongside the message; the tool incorporates it into the compression function. The result functions as a message authentication code (MAC) without the HMAC construction overhead — it's faster than HMAC-SHA256 and provides equivalent security. This is one of BLAKE2b's main design advantages over SHA-2. For API authentication, webhook signatures, and other MAC use cases, BLAKE2b-keyed is a defensible alternative to HMAC-SHA256 — though HMAC-SHA256 still has broader ecosystem support.
DO NOT use BLAKE2b for password hashing — what should I use?
Raw BLAKE2b is too fast for password hashing — a modern GPU can compute billions of BLAKE2b hashes per second, so even salted password databases fall to brute force in minutes. The right way to use BLAKE2b for passwords is indirectly, through Argon2id — which uses BLAKE2b as an internal primitive but adds the memory-hard work factor that makes brute force expensive. For passwords directly, use [Argon2id](/tools/argon2-hash-generator-verifier/) (OWASP 2024 default, m=64 MB, t=3, p=1), [bcrypt](/tools/bcrypt-hash-generator-verifier/) (cost factor 12+), scrypt, or PBKDF2. The 'slow by design' property of these algorithms is what makes them safe; BLAKE2b's speed is exactly what disqualifies it for direct password use.
How do I identify a BLAKE2b hash?
BLAKE2b hashes have variable output length (1-64 bytes), so the hex string can be anywhere from 2 to 128 characters. The most common output lengths are 32 bytes (64 hex chars) and 64 bytes (128 hex chars). At those lengths, BLAKE2b is indistinguishable from SHA-256 or SHA-512 by hex alone — use the [Hash Identifier](/tools/hash-identifier/) tool to rank candidates by likelihood based on source system, surrounding format, or encoding hints. The identifier shows the Hashcat mode number for each candidate; BLAKE2b is mode 600 in Hashcat. After identifying, return here to generate or verify the hash against a known input.
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