bsht that 'Support All Popular Formats' - in 2021 software for searching duplicate images without support for webp files is worthless, but we can enable searching among IFF files (times of Motorola 68000 processor :D) or .SGI = Silicon Graphics Image - when did you last encountered IFF or SGI on your disk? I'm asking the authors of this program :>
For others I'll remind that IFF is the great-great-grandfather of PNG :D

The free open-source tool AntiDuplNET searches all popular formats, including webp, without any problems.

I don't normally comment but it wouldn't install for me. I downloaded it, extracted the file and ran setup. It immediately came back with a 'windows can't access resources' and something about running it as an administrator. The setup file then disappeared leaving only the readme file. Downloaded it again and same result.

Very disappointed as it was just the application I was looking for. Will try visipics or awesome duplicate photo finder as mentioned in some of the other comments

Easy, fast installation, activation code in the package. However:
- no options to skip smaller (or very large) files;
- no option to select video files (or any other format, for that matter) (I know, the name is 'Photo Finder', but would have been a useful option)
- only options is file extension - not even sure why there is a 'exclude' list
- scanned an external backup drive with about 60,000 pictures where I knew there were duplicates.
- very inaccurate 'Time remaining' estimation. It started at about 5 minutes; ended up at almost one hour
- on their website, there is a 'free' download version and a 'buy now' option; no indication about version number so no way to compare with the today GAOTD.
- Also no instruction about how to setup/use it; the 'on line tutorial' it's a joke. There is a 'Low/Moderate/High' accuracy option in the Settings, with no information about differences in scanning time or accuracy.
I won't even mention the old and not adjustable GUI already noted on other reviews.
There are a lot of better and even free alternatives.
Cheers!
K_B

Doesn't appear to be a way to expand the column for file name after the list of duplicates has been compiled. Many of my photos have file names much longer than the column permitted. Also, it took me a while to determine, after going to the on-line help, it was the checked marked files which will be deleted. This needs to be made clear at the top of step 3 "Manage Duplicates". Other than those issues the program appears to do what it says. I think it may be a keeper.

Downloaded this program and ran it twice on a very fast, up to date windows 10 machine..
...... Blamed Out twice... AND, Does Not work... Look like the company needs to go back to the drawing board

Used "Default" setting on just 1 drive........ Will NOT Work
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Seems to be limited to 50,000 images; at least that's what the result page says was scanned. Unfortunately, did not time it but it seems to work quickly.

I agree with the others saying that columns need to be adjustable, and different sorts allowed. Default sort seems to be image size - smallest to largest.

Installation is good and simple, offers options for where to install and place prog in menu. I install as a non-admin user (giving admin password to install). Some of thes GAotD programs only install for the admin acct. On uninstall, found a ton of leftover registry entries.

Visipics also does a great job and it's free: http://www.visipics.info/index.php?title=Main_Page

Installed easily and did a fast search.
Really needed a way to reverse the photos that were auto selected for managing ie it ticked the boxes of the second duplicate it found in the order it found them and I could not find a way to reverse that (except by unticking all the boxes then ticking the other boxes manually which is very time consuming).
In settings I selected "low accuracy" which I presume means that the photos were not always 100% the same and the preview was too small to spot any small differences. So if there were two shots of the same thing only difference between them being; for example; that in one she was smiling and the other not it was a long process to view them properly to determine which to delete.
Is high accuracy 100% the same? I hit on line tutorials but the page it went to did not say.
So IMO useful as a quick guide of what / where to look but not really a place to delete stuff without further work.

I have folders that are several levels deep. That makes the duplicate file list extra wide.
In Step 3, the filename column width does not seem to be adjustable so I cannot tell the difference between two files if the filename is wider than the predetermined width. Likewise, I cannot tell by looking at the Preview section to the right. The only way I can tell the difference is to choose to rename a file, then scroll to the end to see the filename. I can also see the full name if I export the data, but that is of little value for renaming or deleting. If the developer can make the name column width controlled by the user, then I think it will be a great improvement.

I've been using "Awesome Duplicate Photo Finder" for years. It's always free and it gives you a similarity score. I highly recommend it.

To be useful (to me), it needs at least a couple easy tweaks: in the list of files (possible duplicates), allow the columns and the partition to be adjustable (by dragging the dividers or separator).

As it stands, on a large screen long filenames still get squashed to be nearly useless, the path column is way too wide, and the user cannot enlarge the preview image by dragging the separator between it and the file list.

Absolutely a keeper for me.

what is password ?

Tried it. Found it useful. Thank you.