If no group name is specified, the tag is created in the preferred group, and updated in any other location where a same-named tag already exists. TAG may contain one or more leading family 0, 1, 2 or 7 group names, prefixed by optional family numbers, and separated colons. ^= is used to write an empty string instead of deleting the tag when no VALUE is given, but otherwise it is equivalent to =, but note that the caret must be quoted on the Windows command line. += may also be used to increment numerical values (or decrement if VALUE is negative), and -= may be used to conditionally delete or replace a tag (see “ Writing Examples” for examples). += and -= are used to add or remove existing entries from a list, or to shift date/time values (see Image::ExifTool:: and note 6 below for more details). comment=wow), or delete the tag if no VALUE is given (eg. Write a new value for the specified tag (eg. Recursively rename all JPEG photos in a directory based on the DateTimeOriginal field: exiftool '-filename).Only change the DateTimeOriginal field subtracting 1.5 hours, without keeping backups: exiftool -DateTimeOriginal-=1.5 -overwrite_original.

Move the date at which all JPEG photos in the current directory were taken 1 day and 2 hours backward: exiftool '-AllDates-=0:0:1 2:0:0' -ext jpg.Move the date at which all photos in a directory were taken 1 hour forward: exiftool '-AllDates+=0:0:0 1:0:0' path/to/directory.Remove all EXIF metadata from the given files: exiftool -All= file1 file2.Read and write meta information in files Examples (TL DR)

Exiftool delete all metadata