*What is a TIFF format? TIFF (Tag Image File Format) is a widely supported open file specification, originally developed by Aldus (acquired by Adobe). It is a raster-based format commonly used for images that come from optical scanners, graphics/photo editing applications, etc. TIFF files can span multiple pages, contain a number of different raster format "encodings" (ways to represent pixels dots with compression). This app allows you to view multi-single page color TIFF, various image files.