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About PPM Files
A .ppm file is an image saved in the Portable Pixmap format. This format is used primarily by Netpbm, an image manipulation library created by Jef Poskanzer. PPM files typically contain color images, which may be saved in either a plain text or binary format.
While many image viewers and editors can open PPM files, the files often have large file sizes, since they are not compressed. To reduce a PPM file's file size, you may want to convert it to a compressed image format, such as PNG (.png), JPEG (.jpg), or TIFF (.tiff). Note that you may lose some image quality when you convert a PPM image to a compressed format.
About FileHelper.com
FileHelper.com is a free web-based file utility that can open Portable Pixmap 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. FileHelper.com can also view and convert images to several common formats. Have an unknown file or a file without an extension? No problem — FileHelper.com can identify over 15,000 file types.