100% Free

B1 Archiver is 100% free file archive manager. You can use it on any computer and you don't have to register or pay anything. Feel free to share B1 Archiver with your friends or co-workers.

Available for Windows, Linux and Mac OS

B1 Archiver works on all platforms - Windows, Linux and Mac. You no longer need different archive software on your pc and laptop. B1 is the best unified solution for every device.

Version for Android

Looking for a nice, powerful, yet free archive manager for Android? B1 works on Android as perfectly as on other platforms!

Simple & fast

B1 Archiver is extremely simple to use, you don't need comprehensive manuals or guides. Just install it and enjoy. Also it works very fast even with large archives with many files.

Safe & secure

We apply the highest safe standards and care about your confidentiality. B1 Archiver never gathers any kind of personal information and does not install any malicious software.

Best format for everyone

B1 archive is an open archive format which combines best proven solutions and our new original ideas. Itís free and available for both personal and commercial use.

Open source

We're happy to share b1 with everyone, so all code is open. You can download sources of all b1 tools and libraries here. Feel free to use them in any of your products or services.

Developers community

We developed tools and libraries to work with b1 archives. Please refer to project documentation and discussion group. Feel free to ask support should you have any questions.

Best speed to compression ratio

Though classic LZMA compression has been improving for over a decade, there are still some options to explore. For .b1 we designed an improved compression algorithm with much better speed to compression ratio.

Encryption with password

With encryption you can protect data with 256 bit AES encryption algorithm. No one will be able to read or extract original files without password.