Guides

MP4 to MP3, with the details that matter.

Each guide answers one question, states the limit that actually applies, and links back to the converter. No listicles, no invented test data.

MP4 to MP3 at 320 kbps

320 kbps is the maximum MP3 bitrate. What it does to an MP4's AAC track, when it is wasted, and how to set it without guessing.

QuickTime exports M4A, not MP3. Here are the three Mac routes that actually produce MP3: browser, Terminal ffmpeg, and the limits of each.

The iPhone route that works: save the video to Files, open the converter in Safari 26+, convert, and save the MP3 back to Files. No app, no upload.

The exact ffmpeg flags for extracting MP3 from MP4, a batch loop, and an honest comparison with the browser converter.

What an upload converter does with your video, what a local converter does instead, and how to verify the difference in your browser.