Drag the two handles to pick your section, play it back to check, then export. The file is read from your device and never uploaded.
A trimmer does one job: throw away everything except the part you need. That single edit is also the most effective thing you can do to a video file — a 20-second cut from a 4-minute recording is roughly a twentieth of the size, before any compression is involved.
Everything happens inside the browser tab. The clip is decoded by your browser, the selected section is re-drawn onto a canvas and encoded back into a new file on your machine. Nothing is transmitted, which is why this works on a weak connection and why footage with faces, documents or client work in it stays private.
Because the browser can only re-encode frames as fast as it can play them, exporting takes about as long as the section you selected. A 30-second selection takes roughly 30 seconds, no matter how long the original recording was.
Not in one pass. Export the part before it, then the part after it, and join the two in any editor. This tool keeps one continuous section per export.
Chrome, Edge and Firefox encode to WebM, and Safari to MP4. WebM plays in every modern browser and on Android, and uploads fine to YouTube, WhatsApp and Slack.
The video is re-encoded, so there is some generation loss. Pick the High quality setting if you plan to edit the result further; Balanced is fine for sharing.