An ADI file is a data file saved in the Amateur Data Interchange Format (ADIF). It contains contact data in plain text that is exchanged between amateur radio logging software. ADI files are primarily used to transfer logbooks.

ADIF is used in the Amateur Radio Service, which consists of amateurs who use radio technology as a hobby. The format was released in 1996 and was adopted by a variety of Amateurfunk programs as the uniform format for exchanging logs between amateur radio enthusiasts. There are three specifications of ADIF. ADI files may be used by each specification of the format but ADX files (saved in an XML format) are primarily used by the third specification of ADIF. NOTE: ADI files are also saved as .ADIF files.

Disk image created by AOMEI Backupper, a backup and recovery program for Windows users; contains a backup of a hard disk that can be used to restore hard disks when data loss or corruption occurs.

ADI files can be compressed and split into multiple files in order to reduce the size of the image file. You can also reduce the size of the file by choosing to only backup the used sectors of file systems. NOTE: Active@ Disk Image also uses the "adi" file extension for saving disk image backup files.

Monochrome image generated by AutoCAD, a CAD application used to create 2D and 3D designs; contains a black and white graphic that has been plotted from a vector-based drawing; used for storing plotted design drafts.

Contains an index of developer documentation (.ADD) files used by Microsoft Dynamics AX software; provides quicker access and search capabilities for the help documentation.