When you download TikTok MP3 here, the audio comes from the same track TikTok stores for the video, usually at 128 kbps. In a November 2026 test, the MP3 came out exactly like that: 128 kbps, 44.1 kHz and stereo. That's good quality for voices and for listening to music on your phone with regular headphones.
No tool can give you more quality than TikTok has stored. A "320 kbps" MP3 made from a 128 kbps source is just bigger, it doesn't sound better.
For reference, a 128 kbps MP3 takes about 1 MB per minute. A 30-second sound is around half a megabyte.
What about the watermark? Audio doesn't have one: TikTok's watermark is the logo and username shown over the picture. When you download TikTok audio without watermark you get just the sound, with nothing added.