Is my input sent to a server?

No. The entire computation runs inside your browser using a pure-JavaScript BLAKE2b engine. No text, hash, or metadata is transmitted anywhere.

BLAKE2b is a cryptographic hash function optimized for 64-bit platforms. It is faster than MD5, SHA-1, and SHA-256 while offering security comparable to SHA-3. It supports variable-length digests from 8 to 512 bits.

How does BLAKE2b differ from SHA-256?

BLAKE2b typically runs 3–5x faster than SHA-256 in software, supports keyed hashing (MAC) natively, and allows you to choose the output length. SHA-256 always produces exactly 256 bits.

Why would I choose 128 bits instead of 512 bits?

A shorter digest is fine for non-adversarial use cases like cache keys or deduplication IDs. Use 256 bits or more when collision resistance against an attacker matters, and 512 bits for the highest security margin.

Can I reverse a BLAKE2b hash back to the original text?

No. BLAKE2b is a one-way function. Given only a hash, it is computationally infeasible to recover the original input.

Does the tool support keyed BLAKE2b (MAC mode)?

This tool computes unkeyed BLAKE2b hashes. Keyed mode is used for message authentication and requires a secret key — a feature better suited for backend libraries.

BLAKE2b Hash Generator

Name: BLAKE2b Hash Generator
Availability: InStock
Author: Nham Vu

Type or paste any text and instantly get its BLAKE2b hash at 128, 256, 384, or 512-bit output length — computed entirely in your browser.

Input Text

Output Length

0 characters

BLAKE2b Hash

Enter text on the left to see the hash

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Summary

Type or paste any text and instantly get its BLAKE2b hash at 128, 256, 384, or 512-bit output length — computed entirely in your browser.

How it works

Type or paste the text you want to hash into the input area.
Choose an output length: 128, 256, 384, or 512 bits.
The pure-JS BLAKE2b engine encodes your text as UTF-8 bytes and runs the compression function.
The resulting digest is displayed as a lowercase hex string.
The hash updates automatically whenever you change the text or the output length.
Click a copy button to copy the lowercase or uppercase hex hash to your clipboard.

Use cases

Verify file or message integrity using a faster alternative to SHA-256.
Generate deterministic identifiers for data deduplication pipelines.
Understand BLAKE2b digest lengths before integrating into backend systems.
Cross-check BLAKE2b checksums published alongside software downloads.
Experiment with configurable hash output widths without installing local tools.
Prototype hash-based data structures such as Merkle trees.
Test key-derivation inputs before passing them to Argon2 or similar KDFs.
Quickly compare how the same input hashes differently at different digest sizes.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu