What moves across, and what doesn't
A playlist is an ordered list of file paths, and that is exactly what both formats carry: for each track, where the file lives, how long it runs, and the artist and title. The converter keeps all four in the order they were in. Traktor's .nml writes a location as a volume, a folder chain and a filename; the .m3u8 wants one absolute path. This tool joins the three into /Volumes/<disk>/… on the way out and splits the path back on the way in.
What does not move is analysis. Cue points, loops, beatgrids, and Traktor's key and BPM live in each program's own library, not in the playlist file, and neither format has a place for them. Rekordbox will analyse the tracks again when it imports the .m3u8. If you want to keep the energy values you tagged, they travel in the file's comment field, which is what the energy tags reference explains.
Traktor to Rekordbox, step by step
In Traktor, right-click the playlist in the browser tree and choose Export Playlist. You get a folder with the audio and a .nml beside it. Drop the .nml here. If the .nml holds several playlists — a whole folder exported at once, or a collection backup — you get one .m3u8 per playlist and you pick the ones you want.
In Rekordbox, File → Import → Import playlist, and choose the .m3u8. Rekordbox follows each path to the audio file, so the tracks have to be where Traktor said they were — on the same disk, under the same name. A track it cannot find is skipped, not invented.
Rekordbox to Traktor
Rekordbox exports a playlist as .m3u8 from the playlist's right-click menu. Drop that here and you get a .nml named after the file, with a collection entry per track and one playlist referencing them. In Traktor, right-click Playlists in the browser tree, choose Import Playlist, and pick the .nml. Traktor reads the paths and analyses the tracks itself.
This used to be TraktorBox
The converter ran for a while as TraktorBox, a small standalone page. It now lives here, doing the same conversion with the same rules, with one difference that matters: the file used to be posted to a server to convert it, and now the conversion runs in your browser. The playlist never leaves your machine, which is the promise every tool on this site makes.