How to Find & Delete Duplicate Files in Windows 10 & 11

Whether you are downloading email attachments, backing up old hard drives, or importing thousands of photos from your smartphone, your computer is constantly accumulating duplicate files. Over time, these redundant files quietly take over your storage, leaving you with little space for new applications or important system updates.

Not only do they waste storage space, but they also slow down your system’s performance and make it incredibly frustrating to find the correct, most up-to-date version of a document.

In this comprehensive guide, we will explore exactly how to find and delete duplicate files in Windows 10 and Windows 11. We will cover everything from understanding what these files are, how to scan individual and multiple hard drives manually, and how to choose the best duplicate file-removal software to permanently clean up your PC.

What Are Duplicate Files and Why Do They Accumulate?

Before you scan your hard drive for duplicate files, it helps to understand what you are actually looking for. Duplicate files are copies of the same content that exist in multiple locations on a storage device (like your internal SSD or an external USB drive).

While they often have the same content, they might have different file names, creation dates, or folder paths. Here are the most common types of duplicates:

1. Exact Duplicates: These are bit-by-bit identical files with the same content. They may, however, have different metadata or file names (e.g., report.docx and report(1).docx).
2. Partial Duplicates (Near-Duplicates): These files are very similar but not completely identical. A common example is a slightly edited version of a text document or a cropped version of an original photograph.
3. Different Formats: Sometimes the same exact visual or audio content exists in different formats, such as having the same photograph saved as both a .JPEG and a .PNG.

How to Scan Hard Drive for Duplicate Files Manually

If you only want to scan a single hard drive or a specific folder, you do not necessarily need third-party software right away. Windows 10 and 11 provide built-in tools that allow you to locate duplicate items manually.

Method 1. Find and Delete Duplicate Files via File Explorer & Indexing

Using the Indexing Options combined with File Explorer is a reliable way to manually locate duplicates. However, this method requires patience, as you will have to eyeball the files yourself.

Step 1. Configure Indexing Options

1. Click the Windows Start button, type Indexing Options into the search bar, and hit Enter.

2. Click the Modify button and select Show all locations. (You may need Administrator privileges).

3. Ensure that all the checkboxes for the drives you want to search (like your C: or D: drive) are checked, then click OK.

Step 2. Search and Sort in File Explorer

1. Press Windows + E to open File Explorer. Navigate to the drive or folder you suspect is full of duplicates (for example, navigating to C:\Users\YourName\Downloads).

2. In the top-right search bar, type content: followed by the extension you want to clean up. For example, type content: *.jpg to find all JPEG images.

3. Once the search finishes, go to the View tab and click Details.

4. Click the Name or Size column headers to group the files. Duplicate files will usually share the same size down to the kilobyte, or have a (1) or - Copy appended to their name.

5. Highlight the redundant files, right-click, and select Delete.

Method 2. Delete Duplicate Files Using PowerShell (Advanced)

If you are comfortable with command-line interfaces, you can use a powerful script in Command Prompt to automatically locate and delete duplicate files based on their names.

1. Type PowerShell in the Windows search bar, right-click, and select Run as administrator.

2. Use the cd command to navigate to the exact folder you want to scan. For example: cd C:\Users\Admin\Documents

3. Paste the following command script exactly as written and press Enter:

$path = "C:\你的文件夹路径"Get-ChildItem -Path $path -Recurse -File | Get-FileHash | Group-Object Hash | Where-Object { $_.Count -gt 1 } | ForEach-Object { $_.Group | Select-Object -Skip 1 | Remove-Item -Force }

The command will search the directory and its subdirectories, display a list of identically named duplicate files, and prompt you to confirm deletion. Type Y and press Enter for each file you want to remove.

What is the Best Software to Remove Duplicate Files?

Manually scanning your hard drive for duplicate files via File Explorer is exhausting, and using PowerShell is risky. If your goal is to maintain an organized, clutter-free PC across multiple hard drives, the best solution is to use dedicated duplicate file finder software.

There are several programs on the market designed for this, such as CCleaner, Auslogics Duplicate File Finder, dupeGuru, and Easy Duplicate Finder. While these are decent options, they often lock their best features behind paywalls, include bundled bloatware, or suffer from complicated user interfaces.

For the most comprehensive, secure, and user-friendly experience, the premier choice is AOMEI Partition Software.

How to Scan and Remove Duplicates with AOMEI Partition Software

Using a professional duplicate file finder turns an hours-long manual chore into a simple, two-minute task. Here is how to efficiently clear your drives:

Step 1. Launch the Software

Download, install, and launch AOMEI Partition Software. On the main interface, navigate to the Free up menu and click on the Find Duplicate Files tab.

Step 2. Choose Your Scan Type

You will be presented with scanning options. You can click Scan Now to immediately run a deep sweep of your main system C: drive. Alternatively, click Custom Scan.

And, you can remove unnecessary partitions so the removed partitions will not be scanned.

Step 4. In this page, you can also set up an exclusion of all file extensions so that these types of files will be excluded. You can also specially configure file inclusions for picture, video, audio, documents, and archive files so that only these types of files will be included.

Step 5. Click the "Scan" button to start the duplicate files scan process.

Step 6. Smart Selection and Secure Deletion. Once the scan terminates, the GUI will present a clean, perfectly organized visual layout of all duplicate clusters, sorted by total storage footprint.

Instead of forcing you to click through thousands of files manually, click the Smart Select button. The software's logic will automatically flag the redundant duplicates for deletion while safely leaving one master copy of the file uncorrupted in its original location.

Step 7. Finally, click Execute to safely and permanently delete the unnecessary double files, instantly restoring SSD health, reclaiming lost GBs, and leaving your Windows 11 system fully optimized.

Once you are satisfied with the selection, click Clean Now. The software will securely erase the duplicates and present you with a final screen showing exactly how many megabytes or gigabytes of storage space you just reclaimed.

Conclusion

Finding and deleting duplicate files in Windows 10 and 11 is a crucial maintenance task for optimizing system performance and maintaining a clutter-free environment.

While you can technically rely on manual File Explorer searches or advanced Command Prompt scripts to clear out redundant photos and documents, these methods are tedious and carry a risk of human error. By utilizing a powerful, dedicated software like AOMEI Partition Software, you can scan multiple hard drives, instantly filter thousands of exact and partial duplicates, and safely reclaim gigabytes of storage space with just a few clicks.

FAQs

Q: Is it safe to delete duplicate files?
A: Yes, it is generally very safe to delete duplicate files, particularly personal files like photos, videos, and Word documents. However, you should avoid manually deleting identical .dll or .sys files found inside the C:\Windows folder, as some programs require their own instances of system files to run. Using a trusted duplicate file finder like AOMEI prevents accidental system file deletion.

Q: If I accidentally delete the wrong duplicate items, can I recover the files?
A: If you deleted them manually via File Explorer, they are likely sitting in your Windows Recycle Bin and can be easily restored. If you permanently deleted them, you can use specialized data recovery software to scan your drive and retrieve the lost files.

Q: How do I scan an external hard drive for duplicate files?
A: You can scan an external drive manually by plugging it in, opening File Explorer, navigating to the drive letter, and sorting the files by "Size" or "Name." For a faster approach, use duplicate finder software, select "Custom Scan," and choose your external drive as the target path.

Q: How often should I perform duplicate file management?
A: It is highly recommended to scan your computer for duplicate files every three to six months. You should also run a scan immediately after large data transfers, major system backups, or after importing a large number of photographs from a mobile device.