
MP3 at 320 kbps is the highest bitrate the MP3 format supports. For most listeners on most equipment, it is indistinguishable from lossless audio. But there's a catch: YouTube doesn't always serve audio at high enough quality for a true 320 kbps extraction. Here's exactly when it works and when it doesn't.
YouTube encodes every uploaded video into multiple audio streams: AAC at 128 kbps (the default on most clients), Opus at 96–160 kbps (modern browsers), and on premium-quality uploads, AAC at up to 256 kbps. When you ask for a 320 kbps MP3, Vid-Save takes the highest-bitrate stream YouTube provides and re-encodes to MP3 at 320 kbps — the actual audio fidelity is capped by YouTube's source.
Spoken-word content (podcasts, lectures, interviews) is fine at 96–128 kbps. The file is 60% smaller and the audio quality is functionally identical.
For audio editing or sampling, use YouTube to WAV — uncompressed, larger files but bit-perfect to what YouTube serves.