How to find and remove duplicate files in OneDrive

Svitlana Shapovalova
Content marketer
December 18, 2023
7 minutes to read

OneDrive is a popular online file hosting service by Microsoft. You can use OneDrive’s free cloud storage to keep up to 5 GB of your files, or purchase a subscription plan to get more space. In either case, it doesn’t take long before the storage limit is reached. Fortunately you can get rid of useless files, like duplicate photos or documents, from your OneDrive storage to create more space.

In this post we will share two ways to remove OneDrive duplicate files on a Mac.


  1. How to find duplicate files in OneDrive
  2. How to delete files from OneDrive
  3. How to remove OneDrive duplicate files on a Mac
  4. FAQs

OneDrive separator

Manually find duplicate files in OneDrive

As you know, duplicate files have equal size, type, and content. Sometimes the twin files have the same names. When you copy a file in OneDrive, you see a notification that the file you want to add already exists in OneDrive. However, it is possible to keep both items. By default, the number index is added to a copy of a file within the same OneDrive folder, but you can manually rename duplicate files as well.
OneDrive notification - one item was not uploaded

If you want to find duplicate files in OneDrive, you can try the following tips:

  • Search for the duplicate files by name. To find unwanted replicas of files by their titles, login to your OneDrive online account → open the folder where you want to search for same files → click Name at the top of the list of files → select A to Z to sort items by name. Skim the list to find files with equal names or the same name with a number index in parentheses. If they are duplicates, their content, type, and size should be the same.
    Account opened in browser with highlighted Name header cell
  • Search for duplicate files by size. In case you renamed existing copies, you can try to identify twin files by size. So within the folder with estimated duplicates, arrange the items by Size. If the content and type of files are matched, it’s likely they are duplicates.
    OneDrive account opened in browser with highlighted Size header cell
  • Search for same files by content. The largest part of most OneDrive storage data is taken by photos. You can try to find identical images by eye. Within the folder with photos, set the view option to show items as Tiles and sort them by size. It’s very likely that the images with the same size and visual content are duplicate photos.
    Microsoft account opened in browser with duplicate photos ticked

Removing duplicate files from OneDrive online

It’s common to rationalize that we will find and remove unwanted duplicates later, but never actually do so. Not this time! Once you have identified all duplicates in OneDrive, you can easily remove them. For this, tick all unneeded twin files and click on Delete at the top menu of OneDrive cloud storage.
Ticked duplicates and highlighted Delete option in the account opened in browser

The previous methods of finding and removing duplicates in OneDrive are tedious. Just imagine that you have 100 GB or 1 TB of data in your storage space. With such a large amount of files, you will have to open every single folder, sort files, skim and detect equal files to remove the useless ones. Instead, you can use a special software tool to automatically find and remove duplicates from your Mac.

Remove OneDrive Duplicate Files from Mac

If you use the OneDrive app for Mac, try the free Duplicate File Finder application for deleting duplicate files from your storage easily and quickly .

Duplicate File Finder can scan your folders and find identical files by type, size, and content. Within OneDrive storage, Duplicate File Finder will detect all duplicate photos, documents, videos, and other files among all your folders, as well as identical archives and folders.

Important note!
the duplicate finder compares files from OneDrive that are locally stored on a Mac’s hard drive. Please, make sure that your OneDrive files are downloaded to your Mac before you start scanning them for duplicates. To check whether the files and folders are downloaded, look at the icon located on the right of the item in the OneDrive folder in Finder. The Cloud icon next to the file means that the file is located online. The green check mark means that the file is downloaded on your Mac.

How to download OneDrive files to Mac:

  1. Open Finder and go to the OneDrive folder.
  2. Find the files that are located online. They are marked with the Cloud icon.
  3. Right-click on the file to open the context menu. Select Open With → OneDrive File Launcher. The file will be downloaded.
Open with Another method to save files to your Mac, is to select the Always Keep on This Device option from the context menu. Always Keep on This Device Once you download your OneDrive file to your Mac, take the steps below to find and remove duplicates from your cloud storage space.

Guide on how to find and delete duplicate files in OneDrive:

To remove duplicate files in OneDrive using Duplicate File Finder, take the following steps:

  1. Launch Duplicate File Finder.
  2. Add OneDrive for scanning.
  3. Click Find duplicates.
  4. OneDrive folder to be scanned
  5. In the next moment, you will see the scan’s results. You can open the drop-down menu to see certain groups of duplicate files.
  6. Duplicate finder showing the drop menu to select types of duplicates
  7. You can select each duplicate step-by-step or click on the Auto Select button to allow the app to automatically choose unneeded copies. Then click on Review & Remove.
  8. Duplicate finder with the Auto Select button highlighted
  9. You will see a list of all the items you want to delete from your storage. Skim the files and click Remove to confirm the action.
  10. Confirmation window to remove duplicate files

By default, all deleted items are moved to the Trash on your Mac. However, in the Preferences of the app, you can select to permanently remove duplicate files from Mac or move them to a specific folder.


Cloud storage services allow us to keep tons of information and easily share it with others. Using OneDrive, you can store up to 6 TB of data and share it with family members. However, even this huge online storage account will eventually run out of space. To help you to free up space and organize your OneDrive files, use the free Duplicate File Finder app on your Mac.

You can download the application from App Store and use it for free. If you would like to get more benefits, such as merging folders, organizing files, and even finding similar photos, use the Pro version of the app, which is available via in-App purchase for $19.99.


How do I scan for duplicates on OneDrive?
Why is OneDrive duplicating files?
Does deleting files from OneDrive delete from your computer?

Learn how to find and delete duplicate files in Cloud Storages in detail in our previous articles:
How to find and remove duplicate files in Dropbox
How to find and remove duplicate files in Google Drive
How to remove duplicate photos in iCloud

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