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A .dib file is a Device Independent Bitmap raster image file. DIB files are very similar to Windows Bitmap (.bmp) files, but with different header metadata. Most DIB files are uncompressed, but the format supports RLE compression to slightly reduce file size when enabled.

Any image editing program that can open a bitmap file can open a DIB file, as the formats are nearly identical. Since they're often uncompressed, converting one into another format can save disk space. A DIB of a photograph can be converted into a JPEG (.jpg) file, which will take up less disk space even at high quality. Converting a DIB to a PNG (.png) file will also save disk space while maintaining image quality since PNG compression is lossless.