What is a BRUSH file?
A .BRUSH file is primarily a Procreate Brush file. Developed by Savage Interactive, the Procreate digital illustration app uses these files to store custom brush settings, textures, and shape definitions. Most of these files are standard ZIP archives containing configuration data and images. Less commonly, a .BRUSH file can be a game entity sprite definition for the Battle Brothers game, or an old Xerox Doodle Image created by Xerox.
How to open BRUSH files?
You can open a .BRUSH file directly in Procreate on an iPad. Because the format often uses standard ZIP compression or plist structures, you can also rename the extension to .ZIP and extract it using archive tools like 7-Zip. This allows you to inspect the internal textures. For Battle Brothers files, players often use community modding tools to view the sprite definitions.
viewer.online/Using brush
Because the .BRUSH extension has multiple possible meanings, viewer.online/brush analyzes .BRUSH files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Summary
Because most .BRUSH files use the known ZIP format, viewer.online/brush can safely open and display them online, eliminating compatibility problems.