Spotify → Deezer

2 Pick a playlist

3 Match on Deezer

4 Put it into Deezer

Deezer closed its developer portal to new apps, so no program can write to your account through the official API any more. The script below does it the only way that is left: from inside your own logged-in Deezer tab.

1. Open deezer.com and log in.
2. Press F12, open the Console tab.
3. Firefox and Chrome may ask you to type allow pasting first. That warning exists because pasting a stranger's script into your account is dangerous — read this one before you run it.
4. Click below, paste, press Enter.

The CSV is the escape hatch: importers like Soundiiz and TuneMyMusic accept it, and it is plain text you can keep.