Command-line implementation of the BLAKE3 cryptographic hash function. Prints the BLAKE3 hashes of files or of standard input.
BLAKE3 is a cryptographic hash function that is:
- Much faster than MD5, SHA-1, SHA-2, SHA-3, and BLAKE2.
- Secure, unlike MD5 and SHA-1. And secure against length extension, unlike SHA-2.
- Highly parallelizable across any number of threads and SIMD lanes, because it's a Merkle tree on the inside.
- Capable of verified streaming and incremental updates, again because it's a Merkle tree.
- A PRF, MAC, KDF, and XOF, as well as a regular hash.
- One algorithm with no variants, which is fast on x86-64 and also on smaller architectures.
BLAKE3 is based on an optimized instance of the established hash function BLAKE2 and on the original Bao tree mode. The specifications and design rationale are available in the BLAKE3 paper. The default output size is 256 bits. The current version of Bao implements verified streaming with BLAKE3.
Publisher’s description
What is b3sum?
b3sum by BLAKE3 Team is open-source Windows software. It is written in Assembly.
Installation and requirements
The publisher provides Portable installers for 64-bit Windows. It runs without installation (portable).
Updates and version history
The current version is 1.8.7, released on August 20, 2026. The version history goes back to April 25, 2026: 3 releases, all linked to the official files.
Popularity and file types
The source code on GitHub (BLAKE3-team/BLAKE3) has 6,486 stars.
Project description on GitHub: “the official Rust and C implementations of the BLAKE3 cryptographic hash function”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Large user base
Cons
- No native ARM64 build
In short: b3sum is an open-source Windows tool for 64-bit PCs.
Is b3sum safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
FCE0C2406A1E92B49FEDD02A48A67DC5BA71C3A85EB80A2F950ED985F90E76E2· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 3 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 1.8.7Latest | August 20, 2026 | — | 64-bit Portable |
| 1.8.6 | August 5, 2026 | — | 64-bit Portable |
| 1.8.5 | April 25, 2026 | — | 64-bit Portable |
Install from the command line
Silent install ›winget install --id BLAKE3-Team.b3sum -escoop install main/b3sumProgram files (.exe): b3sum.exe
Related guide: How to use winget: install and update apps
Also for other systems
brew install b3sumInformation
- Publisher
- BLAKE3 Team
- Licence
- CC0-1.0 OR Apache-2.0 OR (Apache-2.0 WITH LLVM-exception)
- Price
- Free
- Source code
- github.com/BLAKE3-team/BLAKE3
- Written in
- Assembly
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- Portable
- Version
- 1.8.7
- Released
- August 20, 2026
- Added to the catalogue
- June 18, 2026
- Versions listed
- 3
- GitHub stars
- 6,486
- GitHub forks
- 496
- Website
- github.com
- winget ID
- BLAKE3-Team.b3sum
- Scoop package
- main/b3sum
Ratings and reviews
No reviews yet. Be the first to rate it.
Frequently asked questions
Is b3sum free?
Yes. b3sum is open-source software under the CC0-1.0 OR Apache-2.0 OR (Apache-2.0 WITH LLVM-exception) licence.
Is b3sum safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install b3sum with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does b3sum run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of b3sum?
The versions page lists all 3 versions with links to their official installer files, back to April 25, 2026.
Can I use b3sum without administrator rights?
Yes, it is portable: unpack and run it.