BMP

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BMP
File extensions	.bmp, .dib (rarely)
Compression	None by default, easily compressible, lossless
Max bit depth	32, but usually 24
Suitable working format	Yes

BMP, or the Microsoft and Macintosh bitmap image, is a common file format used to store images. It is quite notorious for generating images with large file sizes, which makes it unsuitable for posting on the internet. Some image manipulation programs allow BMPs to be saved with basic compression, which can reduce a BMP's size significantly, but nowhere near as effectively as that of PNG, GIF, or JPG.

BMP is the default image format used by MSPaint versions prior to Windows Vista.