What can I use to find duplicate photos, including photos that have been resized?


7 Answers 7


digiKam Install via the software center

Add all the photos to your collection. In the menu, select Tools / Find duplicates. This will look for duplicates across your whole collection.

findimagedupes Install via the software center

A command line tool. Pass all the images you want to compare on the command line.

Geeqie (formerly GQview) Install via the software center

In the menu, select File / Find duplicate. Drag and drop image files do the duplicates window. You can drop directories to add their contents recursively. For visual comparison of images, there are specific, non-default options on a drop-down menu. The "custom" level of similarity allows restricting pairings only to the highest degree of similarity, but it has to be set on Preferences as 99. Even then, it does not work perfectly at least for some kinds of images, like line-art. It unfortunately does not provide an automatic selection mechanism with rational criteria, such as resolution, date or whatever, the automatic selection seems to just randomly just pick the first image found as the reference to preserve. Deleting many images can be extremely slow, as it tries to update the result count at every delete.

All three of these tools find visual duplicates, not just files that are identical byte for byte.

  • 8
    I found that Geeqie works the best. It has a robust set of search modes(name,checksum,size,etc...), powerful Image similarity scanning, detailed info of found duplicates, Simple UI, and there's no need to add images to a collection or album first. My only Cons is that the Duplicate Finder is hidden under the File menu and you have to Drag&Drop from Nautilus(or other FM) in order to add Images/Folders to be searched. Other than that it gets the Job done and does it well.
    – japzone
    Feb 25, 2013 at 3:40
  • 3
    Geeqie can find similar images and it works pretty well, but I found it a bit slow for exact matches and it tedious to remove many duplicates with it.
    – Wernight
    Jul 15, 2013 at 7:16
  • Another choice (which seems to work rather well), is this tool also called findimagedupes, but is unrelated to the tool hosted on Sourceforge.
    – Winny
    Jan 12, 2016 at 19:10
  • Digikam has an amazing duplicate finding interface. I highly recommend.
    – wbkang
    Jul 15, 2018 at 15:36
  • 1
    @wbkang How to "batch" remove multiple duplicates in Digikam? How to ensure only the lower (or equal) resolution duplicate is deleted in this exercise? Feb 1, 2020 at 21:45

FSlint Install FSlint

fslint is a graphical program that can find duplicate files of any type by md5sum. If the images are not identical, they won't be flagged as duplicates. The image below shows a bunch of duplicate pdf files in my Downloads directory:

enter image description here

You can change the advanced search parameters to search by file type and restrict yourself to images only. That's done through changing the "extra find parameters" as find command options. For example, here I am only looking for *.jpg files (in the same path, only looking at my "Downloads" folder:

enter image description here

fdupes Install fdupes

fdupes is an equivalent command-line based tool. Both are available in the repos.

  • 14
    Note that I doubt these programs will find resized duplicates. Oct 9, 2012 at 23:51
  • @Vadi that's a different, and more complicated question. Tineye does image identification which doesn't rely on metadata, hashes, etc (it can identify similar looking images) but that's an online service. They provide an API but I'm not aware of any applications that take advantage of this yet. The other complication is that you wouldn't want to remove similar images all the time, for example if you edit photos but want to keep copies of the originals. Removing identical duplicates is much safer.
    – John Lyon
    Oct 10, 2012 at 0:03
  • 5
    The OP explicitly states "including photos that have been resized" so this is not an answer.
    – Calimo
    Jan 1, 2019 at 14:19

dupeGuru Picture Edition works absolutely great, and is worth trying.

They have a Launchpad PPA, dupeguru (new all-in-one package) or dupeguru-pe (old picture edition package) can be installed from it using those commands:

sudo add-apt-repository ppa:hsoft/ppa
sudo apt-get update
sudo apt-get install dupeguru
  • 1
    Looks like dupeGuru now has no separate editions. It works well, though UI could be better. It's also available in AUR if you use Arch.
    – user31389
    Nov 11, 2016 at 18:17
  • This is heavily outdated now, last version in PPA is xenial, the web doesnt work anymore...
    – jaromrax
    Apr 9, 2021 at 17:14


You can use a command line tool called fdupes to find duplicate files (see man fdupes for more details). I don't know of any way to find 'duplicates' that have been resized. A program that did this would require some sort of intelligent algorithm that analyzed the image contents, because when an image is resized its data is changed, so traditional duplicate finding methods would not work.

To install fdupes in all currently supported versions of Ubuntu open the terminal and type:

sudo apt install fdupes
  • fdupes will also miss duplicates in different directories; let's say you have two copies of a photo one in folder birthday-party/ and the other in family-stuff/ ... "fdupes -fr ." will miss this duplicate.
    – lrkwz
    Mar 11, 2014 at 22:57
  • 3
    fdupes does not handle duplicates that have been resized, nor changes in metadata.
    – Calimo
    Jan 1, 2019 at 14:21

imgSeek Install imgseek

imgSeek can find duplicates as well as similar pictures (so it should be able to find resized photos and photos with different filenames and metadata) and even search photos based on a sketch. It is available in desktop and server versions.

I haven't actually tried it myself, though.

  • only available for Ubuntu 10.04, though there is a perl library for 12.04
    – drevicko
    Mar 30, 2014 at 3:06
  • The server version isk-daemon works on 12.04, though I found I had to install from source (pip install as per the instalation page didn't work)
    – drevicko
    Mar 30, 2014 at 11:46


Visipics is a free Windows application for that function, but works just fine on Linux, via wine, of course (It's better than geeqie/gqview regarding the sorting of the duplicates (geeqie's results are absolutely "un-sortable")).

You can tell it to auto-select the images based on criteria such as smaller file size, non-compressed type, lower resolution (it won't do the opposite though, you'd need to do it manually, which wouldn't be much better than doing it on geeqie, except that the selection doesn't require holding Shift/Ctrl), and even prioritize folders (but the last priority is folder priority).

You must pay attention to symbolic links, though -- it can "randomly" select to save a symbolic link to a file while deleting the actual file as a "copy". That's a shame.


I've written this Python script to find visually similar images, and delete all but the largest one.

It uses findimagedupes internally, to find the duplicate images.

It can be invoked with the -d and -r options for your use-case which would:

  • Not delete (the lower-sized visually-similar) files.
  • Output a "dups.txt" file which would contain the duplicate (visually-similar to be precise) files.


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