How to Find and Remove Duplicate Tracks in Rekordbox

Rekordbox has no built-in duplicate finder. If you have been importing music for years, downloading from multiple sources, or merging libraries from different computers, you almost certainly have duplicate tracks in your collection. This guide covers how to find them and safely remove them.

How Duplicates Happen

Duplicate tracks accumulate in Rekordbox in several ways:

• Re-importing the same folder after moving files to a new drive
• Downloading the same track from Bandcamp, Beatport, or Soulseek at different times
• Merging libraries from a laptop and desktop
• Copying a friend's USB that overlaps with tracks you already have
• Re-encoding a track in a different format (FLAC and MP3 of the same song)

Why It Matters

Duplicates are not just a cosmetic problem:

• Inflated track count makes your library harder to browse
• Wrong version in a playlist - you might have cue points set on one copy but accidentally added the other to a playlist
• Wasted disk space - two copies of a 50MB FLAC file add up across a large library
• Confusion during a set - searching for a track and seeing it twice with no way to tell which is which

The Manual Way: Sort and Compare

The most common manual approach:

1. In Rekordbox, go to your Collection
2. Sort by Title or Artist
3. Scroll through and look for entries that appear twice
4. Compare file paths to see which is which
5. Right-click and remove the one you do not want

This works for small libraries but is impractical for collections with thousands of tracks. You also risk removing the copy that is actually in your playlists, which breaks those playlists.

The Risk: Breaking Playlists

Here is the real danger with manual duplicate removal. Say you have two copies of "Track A" in your collection. Copy 1 is in three playlists. Copy 2 is in zero playlists. If you delete Copy 1 (the wrong one), all three playlists now have a missing track. Rekordbox does not warn you about this.

To do it safely, you would need to check every playlist for every duplicate before deleting. For 200+ duplicates, this is not realistic.

The Automated Way: Mirrorbox

Mirrorbox scans your Rekordbox library and finds duplicates by matching filename, file size, BPM, and duration. It shows you every duplicate group and tells you exactly which playlists each copy belongs to.

For each group, you select which copy to remove. Mirrorbox automatically reroutes all playlist references to the copy you kept - no broken playlists, no manual checking. You can also auto-select across all groups (Mirrorbox picks the best copy to keep based on which has more playlist appearances).

Optionally, the removed files can be moved to Trash for easy recovery. Every action has a full undo in the Action History.

Related Guides

• How to Fix Missing Files in Rekordbox in Bulk - fix the other common library problem
• Convert FLAC in Rekordbox Without Losing Playlists - converting often reveals duplicates
• Rekordbox Library Management: A Complete Guide - all tools compared