Duplicate files are those files that share the same characteristics viz. name, extension, size, etc. but are present on more than one location in Mac storage drive. Duplicate files don't add any extra value but waste your Mac storage space. So to free up drive space on your Mac, you should find and remove all duplicate files. The next sections describe various ways to remove duplicate files from your Mac for free.
1.手动方法来删除重复的文件
Search duplicate files in macOS by scouring through your Mac hard disk or SSD. When you find the duplicate files, keep only one file at your desired Finder location and remove all the clones. The process of finding and removing duplicates can be simplified as follows:
Step 1)OpenFinderfrom Dock. Go toApplemenu >File > New Smart Folder.
步骤2)In the New Smart Folder window, click the plus (+) button from the top-right corner.
Step 3)Specify search parameters such asKind, File Type,etc. ClickOtherfor more options.

Step 4)From the search list based on the search parameters, find and remove the duplicate files.
Finding every duplicate file and deleting it manually is a tedious & time-consuming task. To fast track this process, you can use a software.
2. SpeedUp Mac Software to Remove Duplicate files
Stellar SpeedUp Macis an innovative cleanup software that helps you search and remove duplicate files with a click of a button. Steps are as follows:
Step 1)In macOS Mojave or later, giveFull Disk Access permission to SpeedUp Macto make it run effectively.
步骤2)Download and install the 30-day freeSpeedUp Macsoftware on your MacBook, iMac, or Mac mini. Launch the software.
Step 3)From the toolbar, click theSettingsbutton. SelectPreferencesfrom the drop-down menu.
Step 4)From the left pane, selectFiles. Click theDuplicate Filestab from the right pane.
Step 5)In theSize greater thanbox, specify the size to scan for duplicate files. Select scan type and scanning option, then clickOK.
Step 6)Click theGeneraltab. Under theFilessection, selectDuplicate Filesand unselect the rest. ClickOK.
Step 7)Return to the launching screen and select a suitable volume to scan. ClickScan. Once the scan is over, click Duplicate Files from the left pane.
Step 8)In the right pane, find all theduplicate files.Keep one and remove all duplicate files. ClickOK.
Conclusion
UseSpeedUp Macto remove duplicate files from Mac for free with a click of a button. Furthermore, schedule the cleanup task at an explicit time to automate the optimization of your Mac. Download the software now to avail the 30-day free trial.