Duplicate File Finder is the most accurate app for finding equal files on a Mac. The application allows you to find all the duplicate files and folders as well as similar photos on any type of disk. It also displays Similar folders. Unlike duplicate folders, which contain absolutely equal content, Similar folders contain both unique and duplicate files. With Duplicate File Finder, you can compare similar folders, then select and remove duplicates, while retaining the folders with unique files.


How to Merge Folders with Duplicate File Finder

  1. Open Duplicate File Finder and scan your folders or disks.
  2. Switch to the Similars tab and click the Merge Folders button, or directly go to the Merge Folders section.

Duplicate Finder app showing Merge folders tab

You will see a dialog window, which displays the folders for merging. Here you can change the merge direction as well as indicate which folders’ files would be copied to another folder.

Merge folder tab showing files in each folder

Click the Preferences icon in the top-right corner of the window to change merge options:

  • Copy unique files
  • Move unique files
  • Set Finder color tag to merged files

Duplicate Finder app showing Merge folders tab


Let’s take a closer look at each option:

  • Copy unique files – the unique files from one folder will be copied to another folder. As a result, the destination folder will contain all the files from the source folder and its own unique files if it has them. Later you can remove the source folder which has only duplicate content.

Duplicate Finder app showing Merge folders tab
 

  • Move unique files – the unique files from one folder will be moved to another folder. Duplicate files from the source folder will be removed. As a result, you get the folder containing all the files from the initial folders.

Finder windows showing moved files after merging folders

 

Please note that, when you move unique files, the source folder will be removed automatically.

Finder windows showing removed source folder after merging
 

  • Set Finder color tag to merged files – select the tag color and, after the folders are merged, the files will be marked with this color in the Finder.

Duplicate Finder app showing Merge folders tab


  1. Set up all the options you require and click Review & Merge. The application will display the duplicate files and unique files which are going to be moved or copied to another folder. Review the files to be merged. To proceed and confirm the operation, click the Merge button. If you want to change the options or cancel the operation, click on Back.
    In our case, we were copying the content of folders 3 and 4 to folder 2.

Duplicate Finder app showing Merge folders tab

In the case, you have files with the identical titles in folders you are going to merge, you can get several results after merging:

  • You have two duplicate files with the same name, size, and content in the source and destination folders. After merging folders, you will have only one file in the destination folder.
  • folders in Finder to be merged

  • You have two different files with the same name in the source and destination folders. After merging, you will have both files in the destination folder. The one file will have the same name, while the other file will get the number index to its title, so you can easily identify it and rename, for instance.
  • files in Finder withne names after being merged

  • You have two duplicate files with the same size and content but with different names in the source and destination folders. After merging, you will have both duplicate files with different names, as the app cannot decide which file to delete. You will have to remove unneeded duplicate after merging.
  • Finder windows showing duplicates after merging folders

Merging similar folders allows you to combine dozens of duplicate files and folders, making the structure pretty much easier. Use the merge option to easily organize your files and don’t leave any duplicate space eaters behind. Keep your Mac clean from useless dupe items.


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