Twitch to MP3Extract audio from any Twitch VOD or clip — free, no account.

vodfetch does not re-encode the audio. Twitch publishes the sound as AAC, and the audio-only download either remuxes those segments into an MP4 container inside your browser or writes them out byte for byte, so the track is copied rather than converted and nothing is lost on the way. What lands in your Downloads folder is an .m4a file, an MP4 container holding a single AAC track. It is not an .mp3. Despite the wording of this page, no MP3 file is produced anywhere in the process, and we would rather say so here than let you find out after a three-hour broadcast has finished downloading.

Which of the two audio extensions you get depends on the Format switch, which lives behind the More options link. With the default MP4 setting the segments run through the in-browser remuxer and the file is saved as .m4a. You get .aac instead in three cases: if you set Format to TS first, if you are recording a live channel, because live capture never goes through the remuxer, or if the remuxer itself fails to load, in which case the download quietly falls back to the raw stream rather than failing. One quirk worth knowing: the Format switch hides itself as soon as you select an audio-only quality, so set it before you switch. Live audio capture also stops on its own after three hours; start it again for another three.

For listening, .m4a is rarely an obstacle. It is the standard AAC container and opens in the default players on iOS, Android, macOS and Windows, in current browsers, and in VLC. Renaming the file to .mp3 does not convert it, because the extension says nothing about the codec inside the container. If you genuinely need MP3, for an older hardware player or an upload form that accepts nothing else, re-encode locally: ffmpeg -i input.m4a -c:a libmp3lame -q:a 2 output.mp3. That is a lossy-to-lossy step, so keep the .m4a as your master copy.

The audio-only entry is not something vodfetch synthesises. It is a rendition Twitch itself publishes in the stream playlist, and it appears in the Quality list under the name and bitrate Twitch supplies for it. The list is sorted source first and then by descending bitrate, so audio-only, being the lowest-bitrate rendition, sits at the bottom for past broadcasts and live channels. Clips have no such rendition at all: they are served as finished MP4 files at fixed resolutions, so a clip always saves as .mp4 and you extract the audio from it yourself. For a past broadcast you can combine audio-only with the trim range and pull just one stretch out of a long stream, keeping in mind that only whole segments are downloaded, so the file starts at the segment boundary before your start time and ends at the one after your end time, typically a second or two of extra audio at each edge.