Welcome to Duplicate File Finder - Help File

Step By Step Guide


Product Help - Please click on the topic below.

Protect Important Folders

You can protect all files found in a specific search folder from accidental delete; files in the protected folders will be disabled and highlighted with a light gray color in the result list.

Prevent Mistakes

If you by mistake marked all files in the group then Duplicate File Finder will warn and show the below Warning Dialog.

Byte By Byte

Byte-by-byte comparison of files means that the contents of two files to be compared, is read byte-by-byte (in parallel) and checked for equality. This method gives 100% accurate results.

File A: 1010101010101

File B: 1010101010101

File A is exactly identical to File B 

Ashisoft Duplicate File Finder matches file contents regardless of file names.

SHA-1 HASH

Files that are possibly a duplicate of another, is read from the beginning to the end, and a unique hash(160-bit) is calculated from its contents. This hash is stored and used to compare with another file's to determine if they are truly identical.

90% Faster for repeated searches: SHA-1 hash comparison is fast, but to really speed up repeated scanning the program will store "Calculated Checksum" of your files. This way if you scan again, or scan it against a new folder, the cached checksum will be used.

If any property regarding a file changes between scans (name, type, size, timestamp) the checksum will be recalculated.

File Properties

This method will match file properties like (file name, extensions, size and date) select the fields you want to use when searching for duplicate files. The more fields you select, the fewer duplicates will be found.

Be careful: You may see different files as duplicates because they've same properties. Its recommended you carefully review and then select files before deleting any files.

Compare Folders

Do you sometimes wish you could compare files in two or more folders?

Ashisoft Duplicate File Finder has a scan mode that's designed to compare files in target folders against files in master folders, making it very clear which files are duplicates and which are the originals.

For example, a scan with two starting folders:

Master Folder (D:\)

  • File A
  • File B
  • File C
  • File D

Target Folder (G:\Backup\)

  • File A [Duplicate of file A in Master folder]
  • File B
  • File B [Duplicate of file B in this folder and Master folder]
  • File E [No duplicate - ignored]
  • File G
  • File G [Duplicated in this folder, but ignored as not in Master folder]

The program also prevents you from accidentally deleting the originals by asking you to confirm the deletion.

List Non-Duplicate Files:- Any files in Master and Target folders which do not have duplicates will be listed in the result list.


Folder Properties

This method will match folder properties like (folder name, size and date) select the fields you want to use when searching for duplicate folders. The more fields you select, the fewer duplicates will be found.

Match ID3 Tags

It is the fastest way to find duplicate songs in your music library. It compares music ID3 tags, such as Song title, Artist name, Album name, and duration. Most audio files have these tags, which means that Duplicate Finder will be able to find all your duplicate songs in one go.

Be careful: You may see different songs as duplicates because they've same tags. Its recommended you carefully review and then select the files before deleting them.


Match Music Content

This method is helpful if your music files do not have ID3 tags, this option will ignore ID3 tags and match only file contents.

Find Duplicate Files In Google Drive

Have you ever wondered how many duplicate files you have on your Google Drive? In the past finding duplicates on a Cloud-based service was really hard - you either had to download all the files to scan them with a duplicate finder or compare them manually online.

Match File-Hashes

This method will match file hashes from google drive and list the duplicate files

Match File-Properties

This method will match file properties like (file name, extensions, size and date) select the fields you want to use when searching for duplicate files. The more fields you select, the fewer duplicates will be found.

Selection Assistance



Clear All Clear all the mark / selected items
Reverse Selection Inverts (reverses) the marks. (i.e. marked files are unmarked, unmarked files are marked).
Mark All Duplicate Files Mark all the oldest files and leave the newest one in each group by modified date.
Select By File Name Will mark all the matching rows given in "search text field". The pattern may be found in any part of the file name.
Select All Long File Names Mark all the longest files names and leave the shorter one in each group
Select All Short File names Mark all the shortest files names and leave the longer one in each group
Select All "Copy of" Style Filenames

Will mark all the files which have "Copy of" style prefixes and suffixes added by Windows Explorer.

For example:

File - Copy.txt
Copy Of File.txt
File (1).txt
File (2).txt
Etc.

Select All Files With "Ext" Extensions Will mark all the files matching "Ext" extensions.
Select By Location Will mark all the matching rows given in "search text field". The pattern may be found in any part of the file path.
Select All Long Paths Mark all the longest file path and leave the shorter one in each group
Select All Short Paths Mark all the shortest file path and leave the longer one in each group
Select All In "Folder" Will mark all the rows matching "Folder"
Select All In "Folder" and Sub-Folders Will mark all the rows matching "Folder and Sub-Folders"
Select All Older Files Mark all the oldest files and leave the newest one in each group by modified date.
Select All Newest Files Mark all the newest files and leave the oldest one in each group by modified date.
Select All Bigger Files Mark all the biggest files and leave the smaller one in each group by File Size.
Select All Smaller Files Mark all the smallest files and leave the biggest one in each group by File Size.
Keep the Longest Length Keeps the longest length (time) in each group and marks the shortest.
Keep the Highest Bitrate Keeps the highest bit rate in each group and marks the lowest.

Frequently Asked Questions


Duplicate File Finder can find exact duplicate files and Duplicate Photo Finder looks for similarities in different images and easily find the duplicates as well as photos of the same pixels, rotated photos, flipped photos, resized photos, and edited images. It supports all popular image formats including RAW, JPG, PNG, TIFF, GIF and much more, which means it won't miss a single duplicate photo on your Windows PC

If you want to find and remove exact duplicates, then Duplicate File Finder™ is for you. With the help of this program, you will be able to manage duplicate documents, photos, songs, videos and more. There are lots of different options and scan methods that guarantee accurate results and make the search quick and easy.

However, if you are looking for a program to manage your photos, we suggest you try Duplicate Photo Finder. While Duplicate File Finder™ is great for finding exact duplicates of your photos, Duplicate Photo Finder can detect similar images of the same subject. This feature is ideal for those who have a large image library and want to get rid of poor quality shots quickly.

Yes, English, Spanish, Polish, French, German, Dutch, Russian, Turkish and Chinese

Yes, Duplicate File Finder has a mode called Folder Comparison, This mode allows you to run very specific scans and find duplicates in specified folders only.

When you use the Folder Comparison Mode, Duplicate Finder asks you to select a Master Folder - a folder the program will use to compare other folders with. After you select the Master Folder, add some Target Folders. When done, perform a scan the usual way. Note that only the specified Target Folders will be scanned.

Duplicate File Finder treats the latest file in a group of duplicates as the original file and in Folder Comparison mode, all the files in the Master Folder are marked as the originals and the files in target folders are marked as the duplicates.
  • We always recommend backing up your files before running any cleanup activity!
  • As a general rule, you should only delete a file if you know what it is, and you are sure you don't need it. If you think you might need it then keep it!
  • It is always a bad idea to delete files from your Windows and Program Files folders unless you know what you are doing.
  • Do not rely on the Windows Recycle Bin as a safety mechanism for large-scale duplicate deletions. DO NOT attempt to clean out files from \Windows with the idea that "If something breaks I can just restore from Recycle Bin." The Recycle Bin is not limitless! Files you put there today may be gone forever two weeks from now.

It's amazing how many extra copies of files can be found on the average computer. A real mess actually! The reasons are many; often you make a backup copy, just in case, before making serious changes, but forget to delete it afterward. Sometimes the same file is downloaded or installed more than once, or extra copies created systematically, e.g. when sorting digital photographs by copying and renaming of files. And, sometimes files are accidentally copied to other locations, and remain there for a long time, i.e. until you find them with Duplicate File Finder!

On the average workstation, there are thousands or even tens of thousands of files. Understandably, it is quite a chore to keep them all organized. With Duplicate File Finder you can find unneeded extra copies of files, that can be safely removed. This way you can reclaim the disk space they occupy and use it for more important data.

There may be many reasons for that. Try doing the following:

  • Remove all filters that may prevent some files to be checked and try again.
  • By default Duplicate File Finder will not scan hidden and system files, to include them goto Settings > Scan Hidden Files
  • Your photos may look the same, but they may have different metadata.
  • You may have the same song saved as MP3 and as WAV. It's the same song to you, but to the software, it's two completely different files.

Duplicate files can begin appearing in your system for a number of reasons, and can have a number of unfavorable results aside from wasting your drive space. Various applications may install the same driver files, DLL's, ocx's (activeX controls), etc. in numerous different locations on your system, or you may copy or download the same files into different folders on your system without knowing it. Sometimes the only result of this is the waste of hard drive space. With Duplicate Finder, you can easily find and remove duplicate files.