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A .pgm file is a grayscale image saved in the Portable Gray Map format. This format is used primarily by Netpbm, an image manipulation library created by Jef Poskanzer. Unlike many other types of raster images, PGM images can be saved in either a plain text or binary format. Binary PGM files may contain more than one image.

PGM files are uncompressed, and so may take up a lot of storage space on your device. Also, not all image viewers and editors can open PGM files. For these reasons, you may want to convert PGM files to common compressed images formats, such as JPEG (.jpg) or PNG (.png).

About File Helper

File Helper is a free web-based file utility that can open Portable Gray Map Image files and over 150 other file formats directly in your web browser. It displays file properties, including metadata, and image EXIF data, along with information about the corresponding file type. File Helper can also view and convert images to several common formats. Have an unknown file or a file without an extension? No problem — File Helper can identify over 15,000 file types.

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