About the BLAKE3 Hash Generator
What is a BLAKE3 hash?
BLAKE3 is a modern cryptographic hash released in 2020, designed to be extremely fast while remaining secure. It produces a 256-bit fingerprint by default, written as 64 hexadecimal characters. Its headline feature is speed: it is much faster than MD5, SHA-1 and SHA-2, thanks to an internal tree structure that can use multiple CPU cores in parallel.
Despite the emphasis on speed, BLAKE3 is a serious cryptographic hash with a strong security design, descended from BLAKE2 and the SHA-3 finalist BLAKE. It is increasingly used in backup tools, content-addressed storage, package managers and version control where hashing large amounts of data quickly matters. This tool uses a from-scratch implementation validated against the official BLAKE3 test vectors, and it runs entirely in your browser.
How to Use This Tool
- Enter your input. Type or paste text on the Text tab, or switch to the File tab and drop in a file. The BLAKE3 hash appears instantly.
- Choose the output. Switch the output between hexadecimal and Base64, and pick upper or lowercase hex.
- Verify a value. Paste a hash you were given into the compare box and the tool tells you instantly whether it matches.
- Copy the result. One click copies the BLAKE3 hash to your clipboard.
Common Use Cases
- Fast file fingerprinting: hash large files far quicker than with SHA-256 while keeping cryptographic strength.
- Content-addressed storage: BLAKE3 is popular for deduplicating and addressing data by its hash.
- Backup and sync tools: modern backup software uses BLAKE3 to detect changes efficiently.
- Integrity checks: verify data against a published BLAKE3 digest.
Frequently Asked Questions
Is BLAKE3 secure?
Yes. BLAKE3 is a cryptographically secure hash with no known practical attacks, built on the well-studied BLAKE2 and BLAKE designs. It provides at least 128 bits of security against collisions, the same target as SHA-256. As with any fast hash, it is not intended for password storage, where a deliberately slow function like Argon2 belongs.
Why is BLAKE3 so fast?
BLAKE3 processes data in independent 1 KB chunks arranged in a binary tree, so the work can be split across multiple CPU cores and vectorized instructions. Even single-threaded it is very fast because its compression function is lightweight. This makes it several times quicker than SHA-256 on typical hardware.
How long is a BLAKE3 hash?
By default BLAKE3 outputs 256 bits, shown as 64 hexadecimal characters or 44 characters in Base64. BLAKE3 can actually produce output of any length, but 256 bits is the standard used here and almost everywhere.
How does BLAKE3 compare to SHA-256?
BLAKE3 is significantly faster and resists length-extension attacks, while SHA-256 is older, slower, and far more widely supported in existing systems and hardware. For a new project that hashes a lot of data, BLAKE3 is attractive; for maximum compatibility, SHA-256 is still the safe pick.
Can BLAKE3 be reversed?
No. It is a one-way cryptographic hash; the original input cannot be recovered from the digest faster than brute force, which is infeasible for anything with real entropy.
Can I hash a file with BLAKE3?
Yes. Switch to the File tab and drop in any file. It is read and hashed entirely in your browser and matches the output of the official b3sum tool.