Use the methods above—especially yt-dlp with FFmpeg—to extract pure, untouched audio from Niconico. Respect the creators, enjoy the music, and keep the spirit of Nico Nico alive in the highest quality possible.
If you don't want to install software, these cloud-based tools work directly in your browser. What you need to know about WAV audio files niconico to wav
(sometimes no extension or .tmp ):
If your goal is , WAV is excellent but large (≈10 MB/min). For casual listening, consider MP3 or Opus instead. enjoy the music
yt-dlp -f bestaudio --extract-audio --audio-format wav "https://www.nicovideo.jp/watch/smXXXXXX" niconico to wav