Paste a YouTube link and get the audio as an MP3. Extracted from the original audio stream, not re-encoded from video. No ads, no signup.
We take the best audio stream YouTube has, usually 128-160 kbps Opus or AAC, and convert to MP3 at LAME V0 (roughly 245 kbps variable). Converting once from the source stream avoids the quality loss of re-extracting from a compressed video file.
It is not re-encoded twice, which is the usual quality killer. YouTube stores audio separately from video, so we convert that stream once rather than pulling sound back out of a finished video file. The ceiling is still whatever YouTube stored.
Audio is a small fraction of a video file. A four minute song is roughly 4-8 MB as MP3 against 30-70 MB for the same clip at 1080p.
MP3 is offered because it plays on everything. The underlying stream is often Opus, which is more efficient, but far fewer devices and car stereos support it.
Up to 30 minutes. Longer recordings need a desktop tool.