PBM File

What are PBM files and how to open them

Are you having problems opening a PBM file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your PBM files.

What is a PBM file?

PBM files have multiple uses, and IFF Packed Bitmap is one of them. Read more about the other uses further down the page.

IFF Packed Bitmap

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open PBM files

Important: Different programs may use files with the PBM file extension for different purposes, so unless you are sure which format your PBM file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested ten different PBM openers which you will find listed below.

Last updated: January 22, 2025

All known file formats using extension .PBM

While IFF Packed Bitmap is a popular type of PBM-file, we know of 2 different uses of the .PBM file extension. Different software may use files with the same extension for different types of data.

Portable BitMap

Portable BitMap (.pbm) is a file format for storing monochrome (black and white) raster images. It was created as part of the Netpbm project by Jeffrey A. Poskanzer. Images in this format store exactly two colors: one represents black pixels, and the other white, with no shades of gray or color. Designers often use it when converting images or processing with simple tools because its structure is extremely simple.

The format is typically produced by programs in the Netpbm suite when converting or manipulating images. It may be used as an intermediate format during conversion between different image types. Because PBM files use no compression and only one bit per pixel (in the binary variant) or ASCII characters in the plain variant, they tend to be larger or less efficient compared to more advanced image formats. Viewing or editing PBM files is done with general-purpose graphics tools or libraries that support Netpbm formats.

There are two variants of PBM files distinguished by how pixel data is stored. The plain version begins with the ASCII magic number "P1" and represents each pixel as a character '0' or '1', where '0' means white and '1' means black; white space between bits is ignored. The binary (raw) version starts with magic number "P4" and stores pixels as packed bits, eight per byte, most significant bit first within each byte.

PBM opener for Windows

We have identified 3 PBM openers that are compatible with this specific type of PBM file.

Various apps that use files with this extension

These apps are known to open certain types of PBM files. Remember, different programs may use PBM files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about PBM file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.