FIG file stores project of vector image creted with X-Window Xfig software. FIG file structure is very simple and well-documented. The format was introduced in 1985 and is no longer actively developed.

Xfig utility offers many various tools for creating drawings and filling them with color, scaling them, grouping and layering. The software exported created images to FIG files by default; however, it also offered option to save projects as more popular raster or vector formats.