User menu > Settings > Configuration Options > Duplicate Check
You can have your library searched for duplicates. For example, you can identify duplicates that entered the library before you set up duplicate checking during upload/import.
How to Check your Library for Duplicates
Select Check for Duplicates. Please note that the Duplicate Check will run under the settings listed above.
For further information on the options that influence how your duplicate check is processing these files click here.
Canto checks the entire library for duplicates, either based on file names or on the MD5 value.
Any duplicates found are assigned to the special Duplicates album at the top level of the library hierarchy. (This does not affect the original album assignment of these assets).
The special Album Duplicates is a good starting point to examine the found duplicates in more detail and decide what you want to do with them.
For example, of the duplicates of a file that is assigned to different albums, you could delete all but one and adjust the album assignment of the remaining file accordingly. However, there may be reasons to keep duplicates. Or it may turn out that the supposed duplicates are not duplicates at all, but different assets with identical names....