Picasa by Google is a free app to help Mac users and Windows users organize and view photos. Picasa is discontinued and replaced by Google Photos, but many people still use Picasa 3, the last version of Picasa. This article will answer a question asked by many Picasa user, which is how to delete duplicate photos in Picasa. Here you will find how to use a Picasa duplicate finder to easily mass remove duplicates.
Check out the facts if you want to efficiently deal with the duplicates in Picasa.
But don’t worry. Below is how to use duplicate photo finder for Picasa to find and mass delete duplicates easily, quickly and reliably.
As mentioned, Picasa doesn’t store your photos. The photos and duplicates displayed in Picasa are actually in the original folders (e.g. Pictures and Desktop) and Photos library (for a Mac). Therefore, to remove duplicate pictures in Picasa is to remove duplicate pictures in the folders and library.
Cisdem Duplicate Finder is the best Picasa duplicate finder to find and delete duplicates.
1. Download and install Cisdem Duplicate Finder. Open it.
2. Click the plus icon 
, add a Photos library or folder, the photos in which are displayed in Picasa, to scan for duplicates. Or, add multiple locations to scan for the duplicates across them.
3. Click Scan.
4. Once the scan is done, go to the Images tab. You can sort, preview and view the found Picasa duplicate photos.
5. This Picasa duplicate photo finder already smartly and automatically selects duplicates for you to mass remove with a click.
6. If you want, you can select or deselect by hand. Or, choose a desired selection rule.
7. Click Delete to remove the selected duplicates.
As a result, the duplicate pictures in Picasa will also disappear.
Note: Scan the correct folder(s)/library for duplicates. For example, I set Picasa to manage the photos in my Desktop folder and Photos library. So I scan the two locations for duplicates. In Desktop there is a subfolder containing a backup of certain photos. I tell the scan to ignore this subfolder by going to Preferences and using the Ignore List feature.
Cisdem Duplicate Finder
Free Download 
Free Download
In Picasa, there is an experimental tool to help users identify duplicate photos. But the tool is not that helpful. It shows false positives. In other words, it identifies unique photos as duplicates. Also, it doesn’t help you get rid of duplicates. You need to delete duplicate photos in Picasa by hand one by one.
1. Open Picasa. Go to the Tools menu.
2. Choose Experimental > Show Duplicate Files.
3. In the upper left corner of the Picasa window, click Search results.
4. You will see groups of duplicate pictures along with some unique pictures. You can start by handling the first group of duplicates.
5. In each group, view the photos, pick a photo to keep and delete the other one(s). Select a photo by clicking it, and you will see the basic information such as filename, extension and size.
6. To delete unwanted duplicate in Picasa, right-click it and choose Delete from Disk.
You can continue deleting other duplicates.
This built-in Picasa duplicate finder needs to be improved, but the improvement will never happen.
Like some photo management apps such as Apple Photos, Picasa has an option to prevent duplicates when importing photos. Here’s how to enable it.
1. In Picasa, go to Preferences.
2. Under the General tab, go to the Files section.
3. Select the box next to Detect duplicates while importing.
4. Click OK.
With this enabled, when you import photos using Picasa, if Picasa detects a duplicate, it will mark the photo and prevent it from being imported. You can unmark the photo and still import it if needed.
Note that this option doesn’t help get rid of the duplicates that already exist.
If you always use Picasa to import your photos, the duplicate detection may help prevent many duplicates from being created, which is good. However, duplicate photos can be there due to various reasons. Once you have them in your folders and libraries, they can appear in Picasa, making it less easy to organize and view photos.
Picasa’s own duplicate image finding tool is not of much help. The good news is that Picasa duplicate finder such as Cisdem Duplicate Finder can really help. Regardless of the tool you use, understanding how Picasa works can help you handle duplicates in an easier and reliable manner.
Rosa has worked in Mac software industry for more than eight years. She believes that the purpose of software is to make life better and work more productively. In addition to writing, Rosa is also an avid runner.
