Guide

Cleaning up duplicate files without deleting something you needed

Duplicate files accumulate quietly through copies, downloads, and multiple backups, and cleaning them up carelessly is one of the easier ways to accidentally delete the one copy you actually needed.

Not all duplicates are truly identical

Two files with the same name are not guaranteed to have the same content — one may be an older or edited version wearing the same name as the other, which makes blind deduplication by name alone risky.

Verify before you delete, not after

Confirming that two files are genuinely identical, rather than just similarly named or similarly sized, before removing either one avoids the most common mistake in manual cleanup.

Keep one deliberate copy, not zero and not five

The goal of deduplication is not to have only one copy of anything important — a backup copy is still intentional and worth keeping. The goal is removing accidental, unplanned duplicates left behind by normal use.

Questions people ask