Nothing is deleted until you say so.
Scans are read-only. Every duplicate is grouped with paths, sizes and dates so you choose which copy to keep — at least one survives in every group, always. When you do want a copy gone for good, a three-pass overwrite makes simple recovery tools far less likely to bring it back.
What makes a scanner trustworthy.
Multi-threaded hashing
Scanning is parallelised across worker threads, so large folders don't sit on a single CPU core.
Recursive scanning
Point it at a single folder or an entire drive — every subfolder is included automatically.
Cross-drive matching
Because matching is by content hash, the same file on two different drives is still recognised as a duplicate.
Read-only by default
A scan never changes anything on its own. You see every duplicate group before deciding what happens to it.
An original always kept
Every duplicate group keeps at least one copy — there's no path that removes every instance of a file.
Standard delete or secure erase
Choose a normal delete, or a three-pass overwrite when a file needs to be harder to recover.
See where this fits in your workflow.
Creative archives, shared drives, photo libraries and backup sprawl — real scenarios, real numbers.