Video tools
Video is the one place where a browser tab genuinely competes with a desktop application, because WebCodecs hands JavaScript the same hardware encoder the operating system uses. It is also the one place where the limits are hardest, so they are stated plainly.
Popular tools
What the browser can encode
Codec support is decided by your browser and your hardware, not by this site. H.264 in MP4 is close to universal; VP9 in WebM is widely supported and usually smaller; AV1 encoding is still rare. Before a job starts, the tool asks the browser whether the configuration is supported and refuses honestly rather than failing halfway through.
Why the file-size limits are lower here
A video is decoded frame by frame, and a single 1080p frame is about eight megabytes uncompressed. The pipeline keeps only a handful of frames in flight at once, but the source file still has to be held, so the ceiling on a phone is a fraction of what a desktop allows. Above that ceiling the tool says so up front and suggests a desktop browser.
Muting is a copy, not a re-encode
Removing an audio track does not require touching the video. Where the container allows it, the video stream is copied through untouched, which is instant and lossless — a re-encode would spend minutes to make the picture slightly worse.