Video Trimmer

A video trimmer cuts a clip down to a single stretch of it. You give it a start and an end, and it writes out just that section, leaving the original untouched. It is the one edit almost every video needs and the only edit many of them need: removing the fumbling at the start before you found the record button, cutting the dead air at the end, or pulling a thirty-second answer out of a forty-minute interview. There is no timeline with layers here, no transitions and no effects, because those are a different job and a heavier tool.

This one runs entirely in your browser. The video is read from your disk into the page, cut there, and handed back to you as a file. It is never uploaded, there is no queue, and no copy of it exists on a server to be deleted later, because none was ever made. That matters more than it sounds for video in particular: a clip is usually the largest and most personal file anyone edits, and the normal arrangement for a free online trimmer is that you hand a stranger your footage and trust the retention policy. The work is done by ffmpeg compiled to WebAssembly, which is the same engine most desktop editors use underneath, running in the tab instead of on a machine you do not control.

Two ways to make the cut, and the difference is worth understanding because it decides how long you wait. Copying the streams is the default: the existing video and audio are repackaged into a new container without being decoded, which is close to instant even on a long clip and loses no quality at all, because nothing is re-compressed. The catch is that a copy can only cut cleanly on a keyframe, and keyframes are typically one or two seconds apart, so the real start can land slightly earlier than the one you asked for. When the exact frame matters, switch to the accurate mode: that decodes and re-encodes the section, lands on the frame you chose, and takes considerably longer for the same clip.

The practical limits are the ones a browser imposes rather than ones we chose. A tab has a memory budget, so very large files and very long cuts are where this struggles, and a single export is capped at thirty minutes for that reason. For a two-hour recording, a desktop editor is the right tool and we would rather say so than hand you a tab that runs out of memory halfway through. For the clip you want to post, the answer you want to send, or the forty seconds you want out of a screen recording, a browser handles it comfortably. MP4, WebM, MOV and MKV all open, and the export keeps the format it came in as. It is free, with no watermark on the result and no account.