McLou As described here Tonfotos only considers dupllicates files that are exact copies. Files that are very similar or modified will not be considered as duplicates. The benefit of approach is that you can actually delete duplicates withouth verifying each file manually, so you can be very efficient. You can get rid of literally thousands duplicates with just one click while being completely safe.
However, if you also need to deal with similar files, you need to use separate software for that. There are tons of applications dedicated to that specific function. Hovewer, please be prepared to check each and every file to decide if this is really a duplicate and which of them should be deleted which one should be kept.
