Questions
What is the difference between fast and frame accurate?
Fast mode copies the compressed video through untouched, which is nearly instant and completely lossless. The catch is that it can only start on a keyframe, and keyframes typically sit two to four seconds apart, so your clip can begin a little before your chosen point and run longer than the span you selected. The tool tells you when that happens and by how much. Frame accurate mode re-encodes the video so the cut lands exactly where you set it, at the cost of processing time and a small quality loss.
Can I cut a section out of the middle?
Not in one pass. This tool keeps one continuous range, which covers the common case of cutting the start and the end. To remove a middle section, export the part before it and the part after it, then join them in an editor.
Is my file uploaded anywhere?
No. The video encoder is compiled to WebAssembly and runs inside this browser tab, so your file is read from your disk, processed by your CPU, and saved back to your downloads folder. There is no upload endpoint. You can confirm it by opening your browser devtools network tab, or by disconnecting from the internet once the page has loaded.
Does trimming reduce the file size?
Yes, proportionally. Keeping 30 seconds of a 2 minute clip gives you roughly a quarter of the size. If you need it smaller still, run the result through the video compressor.
Is there a file size limit?
The tool holds your file in browser memory, so it is capped at 600 MB. That covers most screen recordings and phone clips. For anything larger, trim it down first or use a desktop encoder.