Tags to scan:
When using the Tags scan type, you can select the tags that will be used for comparison.
Word weighting:
See Word weighting.
Match similar words:
See Similarity matching.
Match pictures of different dimensions:
If you check this box, pictures of different dimensions will be allowed in the same duplicate group.
Filter Hardness:
The threshold needed for two files to be considered duplicates. A lower value means more duplicates. The meaning of the threshold depends on the scanning type (see The scanning process). Only works for worded and picture blocks scans.
Can mix file kind:
If you check this box, duplicate groups are allowed to have files with different extensions. If you don’t check it, well, they aren’t!
Ignore duplicates hardlinking to the same file:
If this option is enabled, dupeGuru will verify duplicates to see if they refer to the same inode. If they do, they will not be considered duplicates. (Only for OS X and Linux)
Use regular expressions when filtering:
If you check this box, the filtering feature will treat your filter query as a regular expression. Explaining them is beyond the scope of this document. A good place to start learning it is
Remove empty folders after delete or move:
When this option is enabled, folders are deleted after a file is deleted or moved and the folder is empty.
Copy and Move:
Determines how the Copy and Move operations (in the Action menu) will behave.

In all cases, dupeGuru nicely handles naming conflicts by prepending a number to the destination filename if the filename already exists in the destination.

Custom Command:
This preference determines the command that will be invoked by the “Invoke Custom Command” action. You can invoke any external application through this action. This can be useful if, for example, you have a nice diffing application installed.

The format of the command is the same as what you would write in the command line, except that there are 2 placeholders: %d and %r. These placeholders will be replaced by the path of the selected dupe (%d) and the path of the selected dupe’s reference file (%r).

If the path to your executable contains space characters, you should enclose it in “” quotes. You should also enclose placeholders in quotes because it’s very possible that paths to dupes and refs will contain spaces. Here’s an example custom command:

"C:\Program Files\SuperDiffProg\SuperDiffProg.exe" "%d" "%r"