You can use the Smart Folder feature to find duplicate files on Mac. Smart Folders in the Finder app are dynamic folders that automatically organize and display files based on specific search criteria you set. Unlike regular folders, Smart Folders don’t actually store files; instead, they use search queries to display files from different locations across your Mac that meet the criteria.

When you create a Smart Folder, you set filters or rules—such as file type, date modified, size, or tags—and Finder will automatically populate the Smart Folder with all files that match those criteria. This lets you quickly access certain types of files without needing to manually locate and move them into one folder.

How to find duplicate files on Mac via Smart Folder:

Open Finder, then go to File > New Smart Folder.

In the Smart Folder window, click the + button at the top right.

Set search criteria to filter by file type, size, or name to narrow down potential duplicates.

Arrange files by Name or Size to spot duplicates more easily.

Manually delete the duplicate files found in the search results.

This method is useful for finding duplicates without additional software but requires manual verification and deletion.