Araxis Find Duplicate Files is really simple to use. Just follow the four steps below.
1. Choose which folders to scan
Drop the folders to scan from Finder onto the Folders to be scanned table.
Alternatively, add folders to the table using the Add Folders 
button in the toolbar at the top of the application window.
You can remove folders by selecting them and then clicking on the 
button on the right-hand top edge of the table.
If you regularly wish to search a particular set of folders, you can save your folder list using the Save command in the File menu.
2. Review Preferences
Click the 
toolbar button to open the Preferences window. This window contains settings to customize the behavior of Find Duplicate Files. When you are happy with the settings,
close the window.
Include these file kinds in search results
You can configure the application to only look for duplicates of certain types of file. The table contains a list of common
types of file. Use the check boxes to select the types of file to look for. You can add and remove file types using the 
and buttons to the right of the table.
You can double-click in the Kind and Pattern or UTI columns to edit them. The values in the Pattern or UTI column are used to match files based on their name or type. To match files by name, use wildcard patterns as shown below:
| Kind | Pattern | Description |
|---|---|---|
| JPEG and PNG files | *.jpg,*.jpeg,*.png | Files with an extension of .jpeg, .jpg, or .png |
| .tmp files | *.tmp | Files with an extension .tmp |
| DSC*.jpg files | DSC*.jpg | Files beginning with DSC and with an extension .jpg |
| Makefiles | Makefile | Files named Makefile |
| Photos/*.raw files | Photos/*.raw | Files with an extension .raw at the top level of folders named Photos |
| Photos/**.raw files | Photos/**.raw | Files with an extension .raw at any level under folders named Photos |
To match files based on their type, you can enter a UTI (Uniform Type Identifier) prefixed with uti:. A list of system-declared UTIs can be found on the Apple website 
. Third-party applications can also declare their own UTIs in addition to those listed on that page.
When deleting files
You can choose what happens to files when you delete them using Find Duplicate Files. You can either have them moved to the Trash, or moved to a folder. This latter option enables you to move duplicate files to a holding area pending later deletion when you are sure you no longer need them. Click on the folder path to change the folder to which files will be moved.
3. Go!
Click on the Scan Folders 
button in the toolbar. As the scan proceeds, progress is reported at the bottom of the application window.
4. Work with the scan results
When the scan is complete, any duplicate files found are displayed in the Items found in the last scan table. A file and its duplicates are assigned a distinct background color to aid identification.
You can check or uncheck the Show only duplicate items checkbox to switch between viewing all the scanned files and just those that are found to be duplicates.
Click on a file to display a preview for it in the third panel. Any duplicates of the selected file will also be shown in the preview panel.
Double-click on a file to open it, or select a file or files and press Enter.
To remove duplicate files, select the file or files you want to remove, and press Backspace. When files are removed, they are sent to the destination shown in the Preferences window.
Right-click on a file or a thumbnail preview to display a context menu. The menu contains several useful commands for operating on files. You can even compare two or three files at a time with Araxis Merge, if you have that installed. (Note that the Professional Edition of Araxis Merge is required for three-way comparisons.)
To delete all the duplicate copies of a file, leaving just one instance of the file, use the Delete Duplicate Files... command in the File menu. Deleted files are sent to the destination configured in the Preferences window. The duplicate copy that remains (i.e. that is not deleted) is the first one that was found while scanning the folders in the Folders to be scanned table.