Support Center

It’s not marking my duplicates!

Duplicate File Cleaner uses a true SHA-1 checksum file compare to ACCURATELY find legitimate duplicates. This basically means that it finds all TRUE duplicate files by looking at the actual HASH value. Renaming a file with a different name doesn’t change this.

If the file contents are altered, then it is no longer a legitimate duplicate and Duplicate File Cleaner will not flag it as a duplicate.

If it is not detecting your images as duplicates, then they are not TRUE duplicates. They were altered. Duplicate File Cleaner only finds all legitimate duplicate files.

You can check your SHA1 and MD5 hash checksums to see if they are true duplicates: