In a word, if you are 100% certain about what you are doing when deleting the files, then go ahead. That’s all the things you need to know about removing the duplicate files found by CCleaner. Learn to use the filter feature within CCleaner, because the program allows you to set File Finder to exclude all other files in its folder or parent folders. Sometimes files may have the same filename but different content.Īlso, it’s super important that you make a data backup of your computer just in case. Also, you’d better not delete any duplicate files that are located in this directory C:\Program Files, as most files are required for Windows and third-party programs to run smoothly.ĭespite that, it is probably okay for you to delete those types of files:īefore you delete your personal files, do check twice and make sure they are the same. If you are not familiar with the duplicate files found by CCleaner, it is best to keep them there on your computer. Which Kind of Duplicate Files Can I Delete Safely? For example, an application misbehaves, and at worst deleting a critical file from underneath the Windows system can render it unbootable. If you attempt to delete those duplicate files, consequences can occur. Applications use duplicate files to run well on your computer.īottom line, many of the duplicate files are necessary for the programs and applications to operate, so you don’t need to worry too much about how to remove all of them from your computer – just by freeing up a bit of disk space, not worth it!.The Windows system creates duplicate files to protect you.Third-party programs that you’ve installed on your PC can install multiple copies, often identical copies of files on your machine.There are many reasons why duplicate files can exist on your computer: So you should beware that some of the duplicate files that CCleaner found may have legitimate reasons to exist on your computer and if you delete them incorrectly, your computer can be unbootable (in the worst case)! Why Does My Computer Have Duplicate Files? Note: The Duplicate Finder feature isn’t available in CCleaner for Mac, it’s only available in the PC version. However, it is not intelligent yet to determine which files are useful and which can be safely deleted. The Windows version has a feature called Duplicate Finder (under the Tools tab) which is designed to scan duplicate files. Which Kind of Duplicate Files Can I Delete Safely?ĬCleaner is a powerful utility suite that’s downloaded millions of times (according to Piriform, later acquired by Avast).Why Does My Computer Have Duplicate Files?.The Duplicate Finder Feature in CCleaner.I then did a sharpness test (just sum up all differences from one pixel to the next, the more difference, the sharper, I think I added some non-linearity to that as well) and selected the best. Then I looked at the wanted image sizes and selected the images which matched that first, if any. It worked really well, a crappy, heavily compressed JPG with a water mark checked out as a dupe compared to the original, while two sequent frames in a slow video didn't, and there was a pretty wide margin between their difference values. Then it was just a matter of setting a threshold for what was considered a dupe. This means that it's tolerant towards small differences, but big differences hit hard. When I've done the rough filtering, I compared the points using the square of the differences. I also saved some extra data (average R, average G, average B and so on) to have something database searchable to do most of the filtering, before comparing points. Before testing, I rescaled the image to a fix format (to catch rescales and some crops/borders). More points towards the center of the image, fewer at the edges. Basically, I tested a number of points in each image, few enough to save in a database.
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