Tagged Image File Format (abbreviated TIFF) is a file format for mainly storing images, including photographs and line art. Originally created by the company Aldus, jointly with Microsoft, for use with PostScript printing, TIFF is a popular format for high color depth images, along with JPEG and PNG.

TIFF format is widely supported by image-manipulation applications such as Photoshop by Adobe, GIMP, Ulead PhotoImpact, and Photo-Paint as well as Paint Shop Pro by Corel, by desktop publishing and page layout applications, such as QuarkXPress and Adobe InDesign, and by scanning, faxing, word processing, optical character recognition, and other applications.

TIFF was chosen as the native format for raster graphics in the NeXTstep operating system, and this TIFF support carried over into Mac OS X. Adobe Systems, which acquired the PageMaker publishing program from Aldus, now controls the TIFF specification, although it has not had a major update since 1992 (several technical notes have been published with minor extensions to the format).