.B1 File Extension

B1 Compressed Archive

Developer Catalina Group
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What is a B1 file?

A B1 file is a compressed archive created by B1 Free Archiver, a free file compression utility. It contains multiple files or folders that have been compressed and combined into one file. B1 files can be expanded to their original form using B1 Free Archiver.

More Information

Screenshot of a .b1 file in B1 Free Archiver
B1 file open in B1 Free Archiver

B1 Free Archiver is a simple utility that allows users to create and expand compressed archives. By default, the archives B1 Free Archiver creates are saved as B1 files. B1 files are compressed using LZMA (Lempel-Ziv-Markov chain Algorithm) compression, and they may be password-protected.

NOTE: B1 files may be part of a split archive, in which case they use the .part####.b1 extension. To extract the files a split archive contains, you must possess all pieces of the archive. For example, to extract the files contained in a two-part B1 archive, you must possess both filename.part0001.b1 and filename.part0002.b1.

How to open a B1 file

You can use B1 Free Archiver (cross-platform) to open B1 files and extract their contents. To do so, open B1 Free Archiver, click the Open button, and navigate to and select your B1 file. Then, select the Extract button found in B1 Free Archiver's lower right-hand corner.

If you do not want to download and install B1 Free Archiver, you can use B1's free Online Archiver to open B1 files and extract their contents.

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Programs that open B1 files


Verified by FileInfo.com

The FileInfo.com team has independently researched the B1 Compressed Archive file format and Mac, Windows, Linux, and Android apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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