About this tool
Drop one video or up to twenty, and each comes back without its audio track. The picture is not decoded or re-encoded: the video packets are copied exactly as they are into a new file in the same container, so an MP4 stays an MP4 and the quality is identical. The one exception is a WebM or MKV that carries a rotation flag: those containers cannot store orientation, so the muted copy is saved as MP4 to keep the video upright (if its video codec is not H.264, HEVC, VP9 or AV1, that file fails and says which codec it has). It takes about as long as reading the file, and nothing is uploaded. This is for the clip you want to post without the conversation in the background, or the footage you plan to put your own music under.
The same thing as the Video Trimmer checkbox
Video Trimmer on this site has a "Remove audio" checkbox that does exactly this to the range you cut. This page is the same operation on the whole file, for people who came looking for it by name — and it adds one thing the checkbox cannot: several files in one go. If you need to remove the sound and shorten the clip, use Video Trimmer; if you only want the sound, Extract Audio does the opposite.
Several videos at once
Select up to twenty files. They are processed one after another, and a file that fails — unsupported format, or a file that turns out to contain only audio — does not stop the rest. One video is saved as a single file; two or more are packed into a ZIP, with names made unique when two inputs share one. A video that already had no sound is passed through and labelled as such. The result list shows each file's new size or the reason it failed.
Honest limits
The entire audio track is removed. This page cannot mute only a section, lower the volume, or take out just the voices while keeping the music — those need the audio to be decoded and processed. Files that contain only audio are refused, because there would be nothing left. After every file the tool reads the result back and reports a failure if an audio track is still present.
On desktop Chromium the output streams straight into a file you choose, so a large video never has to sit in memory; other browsers build the result in memory with a limit of about 1 GB per video, and the ZIP has its own cap, so the page stops and tells you if a batch is too large. The output carries only the video packets, not the source's descriptive tags such as title, date or GPS location. If the video also plays sideways, Rotate Video fixes that with the same copy.