Dupe guide

Find old files on Mac that you can probably delete

If you haven't opened a file in three years, you probably don't need it. Here's how to find them.

4 min read

“Old” is a useful axis for cleanup. A file you haven’t opened since 2021 is probably either an archive (in which case it belongs on an external drive) or genuinely forgettable (in which case it can go). Here’s how to surface those files.

Method 1: Finder, sorted by last opened

  1. Open Finder. Navigate to the folder you want to audit (start with Documents or Downloads).
  2. View > as List.
  3. Right-click any column header > add "Date Last Opened."
  4. Sort by Date Last Opened, ascending. Oldest at the top.

Anything that says “never” or 2020 is a candidate for deletion or archive.

  1. Cmd + F in Finder.
  2. Click the + and add "Last opened date — is before — [date 2 years ago]."
  3. Set search location to "This Mac" or a specific folder.
  4. Sort by size to find the biggest old files first.

You can save this as a Smart Folder for re-running later.

Method 3: Terminal

Find files in your home folder not accessed in 365+ days:

find ~ -type f -atime +365 2>/dev/null

Sort by size:

find ~ -type f -atime +365 -exec du -h {} + 2>/dev/null | sort -h | tail -50

That shows your 50 biggest “old” files.

A caution: macOS doesn’t always reliably update access time. mtime (modified time) and ctime (changed time) are more reliable:

find ~ -type f -mtime +730 -size +10M 2>/dev/null

That’s files modified more than 2 years ago that are bigger than 10 MB.

What to do with the results

Three options for old files:

  1. Archive. Move to an external drive or cloud storage. Keep the option to retrieve.
  2. Delete. Trash. If 30 days pass without you missing them, they're gone.
  3. Compress. Right-click in Finder > Compress. ZIPs are smaller and easier to ignore.

Special case: old downloads

The Downloads folder is where “old” hits hardest because most of it never belonged on your computer long-term.

find ~/Downloads -type f -atime +180 2>/dev/null

Files in Downloads not opened in 6 months are almost always safe to bin.

The duplicate overlap

Old files are also where duplicates pile up — five years of “Lecture-Notes-Final.pdf” and “Lecture-Notes-Final-v2.pdf” type filenames, with the actual content the same. Hash-based comparison is the only reliable way to know.

Download Dupe to scan for byte-identical duplicates across however many folders you point it at. SHA-256 hashed for accuracy, moves matches to the Trash, never permanent deletes, never touches system files. $14.99 once.

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