The Best Way to Find Duplicate Images of Different Sizes

Sarah Miller
Updated on June 30, 2024 Preview 458 Preview 1
share it facebook share it Twitter

There are exact duplicate images. There are also non-exact duplicate images, such as photos that look the same but have different sizes. If some of your photos have two versions, one in a bigger size and the other smaller, you may want to remove the unwanted versions. This article shows you how to find duplicate images different sizes in an easy way on Windows PC and Mac. The identification is automatic and the removal is easy and quick.


3 things to know

Knowing these may help you better understand such duplicate photos.

  • The size of an image can refer to the file size, which is how much storage space this image takes up and measured in KB or MB. Also, it can refer to the pixel size, which is the pixel counts (often referred to as resolution) of this image and measured in pixels (such as 3120 x 4160). The pixel size can determine the file size and quality.
  a photo of a rose a photo of a rose a photo of a rose
Pixel size 1600 x 1067 800 x 534 400 x 267
File size 1.4 MB 718 KB 136 KB
  • Why do you have duplicate images in different sizes? There can be various reasons, such as compressing the file size, reducing the resolution (like from 3120 x 4160 to 1560 x 2080), converting the format (like from JPG to PNG), and importing both the HEIC and JPG versions of your photos from iPhone.
  • In a set of such duplicates, which photo should you keep? Ideally, you may want to keep the original one, which generally has the highest resolution and file size. If one version is in JPG and the other in HEIC or RAW, choose the desired format to keep or keep both. HEIC offers the same visual quality as JPG does but use less storage space. You may need the RAW image for post-processing. All in all, it depends on you.


How to find duplicate images of different sizes

There is more than one method. Using Cisdem Duplicate Finder can be the best method due to the following benefits.

  • Automatically identify duplicate images, whether they are exactly identical or have different resolutions, file sizes or formats
  • Also find photos that looks similar
  • Allow you to conveniently preview photos and see photo information
  • Automatically select all exact duplicates for you to remove with a click
  • Offer rules to help you mass select duplicates for deletion by resolution, file size, time, etc.
  • Allow you to manually adjust the selection
  • Help you find duplicates on Windows PC, Mac, external hard drive, SD card, Google Photos, OneDrive and more, including those in the Photos app on Mac and Windows PC

Below are the step-by-step instructions.

Step 1. Install duplicate image finder software.

Download and install Cisdem Duplicate Finder. Open it.

Free Download Windows 11/10/8/7 Free Download macOS 10.11 or later

Step 2. Add the location to find duplicate images.

Use the Add button or drag and drop to add one or multiple folders from your computer, external storage device or cloud storage service. You can also add Mac’s Photos or Windows’ Photos.

duplicate image finder interface showing an Add button, a Settings button and a Scan button

Step 3. Customize settings.

Click the Settings button to open the Settings window. Go to the Similar images tab to select the Enable similar images function checkbox.

the Similar images tab showing that the Enable similar images function checkbox is selected

Step 4. Click Scan.

Click Scan on the right to start scanning for duplicate images.

Step 5. View duplicate images.

When the scan is complete, you’ll see the results window. The Similar Image tab displays duplicate images of different sizes (and similar images if any). The Image tab displays exact duplicate images.

Similar Image tab of the results window showing a few sets of duplicate photos

Step 6. Select unwanted versions of duplicate photos for deletion.

Under the Similar Image tab, go through each set of duplicates and select the unwanted version(s) for removal. To bulk select, highlight the sets (on the left) to which you want to apply a selection rule, click the List button, and choose a desired rule. For example, choosing the Select Smallest rule will automatically keep the photo with the largest file size in each set and select the rest for removal.

a list of selection rules

Step 7. Delete all unwanted versions with a click.

To delete all selected versions at once, just click Delete in the bottom right corner. Confirm the deletion.

The deleted duplicate photos will go to the Recycle Bin on Windows PC, or Trash on Mac, or wherever the deleted files typically go.

Tip: If you are not satisfied enough with what you see in the results window in step 5, just go to the Similar images tab to adjust the settings and then scan again.



Sometimes you compress a bunch of photos to send via email. Sometimes you convert some photos to a certain format to be able to upload them somewhere. This may be how you end up having different sized versions of the same photo. You generally don’t actually need two versions of the same photo.

If many of your photos have multiple versions, you can get rid of redundant versions to improve organization and free up storage space. This article shows you an easy, quick way to find duplicate images of different sizes and remove redundancy. I hope it’s helpful.

Sarah Miller
share it facebook share it Twitter

With a passion for tech and writing, Sarah joined Cisdem, where she focuses on creating articles about using utility tools to enhance file management and simplify contact management.

share it facebook share it Twitter
Comments (1) Leave a Reply

Name *

Comment *

  • Jodok Batlogg

    Exactly what I was looking for. Easy to use. Thank you!

    5 months ago commonReply

    Name *

    Comment *

Hot Articles

How to Find Duplicate Files with Different Names on Windows PC and Mac VisiPics Review, Tutorial and the Best Alternative 2023 CCleaner Duplicate Finder Review: Should I and How to Use CCleaner?
Home > The Best Way to Find Duplicate Images of Different Sizes