Convert multi-bitmap images (MBM) online for free
The converter easily converts your MBM images to various formats - free and online. No Symbian OS or or other Raster Image software needed.
The converter also works in reverse, so you can convert other "Multi-Bitmap Image Container" formats to MBM without using software like Symbian OS or a similar tool.
The .MBM file extension is predominantly a Symbian OS Multi-Bitmap file. Originally developed by Nokia and the Symbian foundation, these files act as containers that hold multiple bitmap images, often paired with transparency masks, used for mobile phone themes, icons, and UI elements. A secondary but notable use of the .MBM format is as an uncompressed 3D texture file for the popular video game Kerbal Space Program. Additionally, a small fraction of these files are bulk emailer documents generated by Maxprog MaxBulk Mailer.
The fundamental problem with the .MBM format today is obsolescence. Symbian OS is officially dead, and modern operating systems like Windows and macOS lack the native codecs required to parse the proprietary multi-image headers. Attempting to open these legacy files usually results in error messages. For gamers, .MBM textures in Kerbal Space Program are notorious for consuming massive amounts of RAM because they are uncompressed, leading players to seek alternatives.
To make these files usable, conversion is mandatory. For web use or viewing, convert the extracted images to PNG (to preserve transparency masks) or JPG. If you are archiving old mobile designs, convert to .PDF/A. For game modders, converting .MBM textures to DDS or TGA will significantly reduce memory overhead. Drag and drop your file here to analyze and convert it - free, online, and without installing software.
Use Convert.Guru to open and convert your MBM file.
Users also converted MIF, MBN, JPG, BMP, NOKIA and NOKTXT files.
If you want to convert MBM file to WEBP, CUR or PSB, you can use Symbian OS or similar software from the "Mobile OS Image Container" category. In the File menu, look for Save As… or Export….
To convert SVG files to MBM, try Symbian OS or another comparable tool in the "Mobile OS Image Container" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our MBM converter.