Clean genres.
Correct years.
Ready to mix.
4ganizer cleans up messy genre tags, fixes wrong release years, and finds duplicate tracks — even under different filenames — so your library imports clean into Rekordbox or Serato, every time.
Free. Apple Silicon & Intel Macs, Windows 10/11. See all releases →
First launch on Mac: macOS will say the app "is
damaged" — that's just Gatekeeper flagging an app that isn't
code-signed yet, not an actual problem. After moving it to
Applications, open Terminal and run:
xattr -cr /Applications/4ganizer.app
Less digging, more mixing.
Genre profiles
Map a messy folder to the genre you want, once — every future scan applies it automatically.
Duplicate finder
Finds tracks that are the same song, even if the filename or tags are different — then clears out every extra copy in one click, even with hundreds of duplicates.
Correct release years
Checks your tracks against a huge public music database, so a track tagged "2023" that's actually a '96 classic gets caught.
Review before anything changes
Every change is shown side by side, so you know exactly what's about to happen before a single tag or file is touched.
Fully undoable
Tags restored, files moved back — every batch can be undone right up until you start the next one.
MP3, FLAC, WAV, AIFF, M4A
The formats Rekordbox and Serato both read, handled carefully so your audio quality never gets worse.
Runs locally
Your library never leaves your machine — we only send a short sound signature online to check years and duplicates, nothing else.
Stop re-tagging by hand.
Free download. Takes a few minutes to set up your first profile.