Duplicate file finders vs DocAttic: delete the copies, or build the archive?

By Michael, founder of DocAttic · October 2026 · 5 min read

dupeGuru, Duplicate Cleaner, AllDup and their relatives are good at what they do, and they are the first thing people try when a drive fills up with the same PDFs. They solve a space problem. DocAttic solves a mess problem. They look similar from a distance and are not.

What a duplicate finder does

It scans the folders you choose, groups files that are identical (by hash, usually, with options for name and size and near-matches for images), and presents the groups so you can choose which copies to delete or move. Everything happens in place. When it is done, your folders are the same folders with fewer files in them. dupeGuru and AllDup are free; Duplicate Cleaner has free and Pro editions.

Where that goes wrong

• It needs you to decide. Thousands of groups, each asking which copy to keep. Most people select "all but one" automatically and hope the kept one was in a sensible place.
• It changes the originals. The only copies of a document can end up deleted from the folder you thought of as canonical, because the finder kept the one in Downloads.
• The mess stays. Fewer files, same seventeen folders across four drives. Nothing is organized; it is just smaller.

What DocAttic does instead

DocAttic reads everything you point it at, the same drives and folders, and copies one of each distinct document into a new archive, filed by year, keeping the real timestamps from inside backups. The originals are opened read-only and never modified, moved or deleted. When it finishes you have a clean folder tree with one copy of everything, a report of what was read, what was a duplicate and what could not be opened, and your old drives exactly as they were, ready to be retired when you have checked the report.

When a finder is the right tool

• Your folders are already organized and you want to reclaim space without changing their structure.
• You want to catch near-duplicates, such as a resized photo, which exact-content matching will not.
• It is one drive, you know it well, and you are happy to review the groups.

When DocAttic is

• The documents are spread across old computers, external drives, Downloads folders and backup exports, and you want them in one place.
• You do not want anything deleted until you have seen a report and checked the result.
• You want to end with a folder you understand, not the same folders slightly emptier.

What about the price?

dupeGuru and AllDup are free, and that is a fair price for in-place clean-up. DocAttic is a one-time $59.99 with a free trial that keeps up to 100 documents and never expires. You are paying for the consolidation and the report, and for never having to decide which of four copies to delete.

Questions people ask

Does DocAttic delete duplicate files?

No. It never deletes, moves or edits anything it reads. It copies one of each distinct document into a new archive and tells you in the report what it treated as a duplicate. You decide what to do with the originals afterwards.

Can I use dupeGuru and DocAttic together?

Yes, in either order. A common pattern is DocAttic first to build the clean archive, then a finder on the old drives if you want to shrink them before retiring them.

Does DocAttic match documents that are similar but not identical?

No. Two files are duplicates only if their contents are byte-for-byte the same. An edited version of a document is kept as a separate document, which is usually what you want for records.