You can preview files before you delete duplicate files in OneDrive by using a method that shows you exactly which files are repeated and where they are stored. This is important because duplicate files often look similar, and deleting them without checking can lead to accidental data loss.

A duplicate scanning tool, such as MailConverterTools OneDrive Duplicate Remover, helps with this by scanning your OneDrive account and listing all duplicate files in one place. Before deleting anything, you can preview file details like file name, size, type, and folder location, which makes it easier to decide which copy should be kept. After reviewing the duplicates, you can safely remove only the extra copies or move them to the bin for added security. This preview-based approach ensures you clean up your OneDrive storage while keeping all important files intact.