Runs on your device · Your file never leaves your device.
Take the sound out of a clip while leaving the picture exactly as it was. Useful for background footage, for removing a conversation recorded by accident, or for a video going onto a page that should not make noise.
The video stream is copied rather than re-encoded, so this is fast and there is no quality loss whatsoever — only the audio track is dropped. A video over 1 GB is muted in parts, each a complete silent video; when together they are too big for your device to hold as one file, the Join mode of the video converter puts them back together.
Because it runs on your device, a recording with something private in the audio never has to be uploaded to have that audio removed.
Not for: Lowering or editing the volume — this removes the audio entirely rather than adjusting it.
Every sound track goes, not only the first: a film with several languages or a commentary track comes back with none. The picture is copied as it is stored, without being decoded, and the file keeps its own format, with -muted added to the name. An MP4 stays an MP4, a MOV a MOV, an MKV an MKV, a WebM a WebM; only a .divx file comes back as .avi and RealMedia as .mkv, the containers that can hold their picture unchanged. That is the difference from the rotate, resize and crop tools, which encode the picture again as an H.264 MP4.
A phone clip stored on its side with a rotation note keeps that note, so it plays the way it did before. If it plays sideways in some program, that program is ignoring the note; /rotate-video turns the pixels themselves.
Nothing is encoded, so the work is reading the file and writing it again, and the picture never passes through an encoder. Before muting, the tool reads the file once to learn its length, which it needs to plan a large file. The first use on a device also downloads the video engine, about 30 MB, which the browser then keeps.
The finished file is held in the browser's memory until you download it, so a video over 1 GB is muted in parts, each made from roughly 350 MB of the original. Each part starts on a keyframe, exactly where the one before it ended, so nothing is repeated or lost at the seams. A silent copy is nearly as large as the original, usually too large to put back together in memory, so you get several numbered files, such as clip-muted-part01of04.mp4, each a complete silent video that plays on its own.
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