Trim video: cut clips to the second
Set a start and end time and keep just that part. Use the preview player to find the moments, then type them in.
Keyframes and exact cuts
Video codecs such as H.264 save one complete picture (a keyframe) every second or few, and store the frames between as changes relative to their neighbours. Cutting without re-encoding can only start on a keyframe, which is why fast "lossless" trimmers often begin a second or two early.
This tool re-encodes the kept section so your cut starts on exactly the frame you chose. The audio is cut to match.
Also useful: rotate a sideways video, join trimmed clips, or turn a short cut into a GIF.
Questions
Why does trimming take longer than I expected?
Compressed video is stored as keyframes followed by frames that only record changes. A cut at an exact moment that is not a keyframe needs the frames around it rebuilt, so we re-encode for frame-accurate cuts.
Can I trim without losing quality?
At the Balanced setting H.264 re-encoding is visually transparent for most footage. For a strictly lossless cut, desktop FFmpeg with -c copy cuts at keyframes only.
Can I keep the same format?
Yes. Pick the same format as your input (for example MP4), or change it at the same time.
Is the video uploaded?
No. Trimming happens on your device.