Choose the part of a video to keep, optionally mute it, and save the trimmed clip.
Export plays the selected part in real time and records it, so a 30-second clip takes about 30 seconds. Keep this tab open and in front while it runs.
Browsers can play video but don't include a tool for cutting a video file directly. This trimmer uses two standard features instead: captureStream(), which turns a playing video element into a live stream of pictures and sound, and MediaRecorder, which encodes that stream into a new file. The tool seeks to your start time, starts recording, plays to your end time and stops. Because it records in real time, export takes as long as the clip, and the result is a fresh encode rather than a byte-for-byte copy.
The output format depends on what your browser's recorder supports, and the menu lists only formats that work on your device. Chrome and Edge can save WebM (VP9 or VP8 video with Opus audio) and recent versions can also save MP4 (H.264 with AAC); Firefox saves WebM. WebM plays in all modern browsers, VLC and most editors. For the widest compatibility with phones and older software, pick MP4 when it is offered.
Quality is set by the bitrate: 5 Mbps is good for 1080p screen and phone footage, and a 30-second clip at that setting is roughly 19 MB. Re-encoding means very fine detail may soften slightly compared with the original. Safari currently doesn't allow recording a playing video, so the export button is disabled there with an explanation. Use Chrome, Edge or Firefox instead.
Why does exporting take as long as the clip?
The browser has to play the selected part in real time while it records it. That approach works without uploading your file or downloading a large video library.
Why doesn't it work in Safari?
Safari does not yet support capturing a stream from a playing video, which the trimmer needs. Chrome, Edge and Firefox on a computer or Android phone all support it.
Will I lose quality?
The clip is re-encoded at the bitrate you choose. At Standard or High most footage looks the same as the original; very detailed 4K video may soften slightly.
Can I switch to another tab while it exports?
Keep the tab open and visible. Browsers slow down background tabs, which can cause stutters or a frozen picture in the recording.
What size of video can I open?
Large files are fine because the video plays from your device instead of being loaded into memory. Phones may struggle with long 4K files, so trim shorter clips there.