Twitch ConverterConvert any Twitch VOD, clip or stream to MP4, or extract the audio — free, no watermark, no account.

For a VOD or a live channel, Twitch does not serve a video file at all. It serves an HLS playlist that points at a long run of MPEG-TS segments, typically a few seconds each. For a VOD, vodfetch fetches those segments six at a time in parallel and pushes them through mux.js, started with remuxing enabled, which rewrites the already-encoded video and audio into an MP4 container. The picture is never decoded and never re-encoded.

That distinction has practical consequences. There is no bitrate or codec setting to get wrong and no encoding wait: the time cost is essentially the download itself, and the result is exactly the rung of Twitch's quality ladder you selected, no better and no worse. It also decides what the tool can accept. The input is a Twitch link, not a file: dropping a video onto the page does nothing, because the drop handler reads a URL from the drag data and starts an analysis with it. There is no file picker and no local file to hand over in the first place.

Not every input takes the remux path. Twitch already stores clips as MP4, so a clip is fetched and saved as-is, with no transmuxing step at all. Live recordings are the opposite: they are written as raw TS the whole time the recording runs, or .aac if you picked an audio-only rendition, and are never remuxed on the fly. The MP4/TS switch therefore only changes anything for a VOD or an already-ended broadcast. The MP4 path also costs memory: the transmuxer collects its output in an array, so the finished file sits in RAM even when the browser is otherwise streaming to disk. For VODs the tool estimates the size from the selected rendition's bitrate and the selected duration, and above roughly 1.5 GB it asks you to confirm, suggesting Format → TS or a shorter trim instead.

Two honest limits follow from remuxing. Trimming selects the whole segments that overlap your range, so a cut file can begin slightly before the start time you typed and run slightly past the end you typed; frame-exact cuts would require re-encoding. And if the transmuxer cannot handle a particular stream, the download stops with a message telling you to switch Format to TS. The resulting .ts file holds the same video and audio, plays in VLC, and can be put into an MP4 container locally with ffmpeg -c copy, which is the same container rewrite the browser was attempting.