Sonify is a free browser-based YouTube to MP3 tool for supported videos you own or have permission to download.

Paste an individual video URL, choose 128, 256 or 320 kbps, and download the MP3 without creating an account or installing software. The current version supports videos up to 30 minutes and 5 conversions per hour. Download links expire after 15 minutes, and a result can be deleted manually. Higher output bitrate cannot restore detail missing from the source.

I maintain Sonify and welcome feedback on the conversion status, download flow and clarity of these limits. Sonify is independent and is not affiliated with YouTube or Google.