ROI Clipper

Draw up to 4 ROIs · label them with your own categories · pick a time range · one button crops and saves

Open the folder that holds your .mp4 files. Boxes and labels save next to each video as <video>.rois.json, and Crop & trim encodes the clips right here in the browser and writes the .mp4 files into the folder you choose. Nothing is uploaded and nothing needs to be installed.

or
🎬
Drop video files here
or click to browse (clips are downloaded instead of written in place)

Folder access and in-browser encoding need Chrome or Edge. The page never uploads anything — every frame stays on this machine.

ROI Clipper v2 standalone
Auto-save OFF — click to set folder

Videos

Select a video from the sidebar
Export range 0:00.000→0:00.000 (0:00.000) drag edges to trim · drag anywhere to scrub · Alt-drag band to move · wheel = zoom, middle-drag = pan
— / —
Speed:

ROIs 0 / 4

Drag on the video to draw · drag inside to move · drag a corner to resize · 1–4 select · Del removes.

ROI label

Crop & trim

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Encodes here in the browser and saves the file — nothing to copy.

Clips written 0

Nothing yet.

ffmpeg batch script for all videos with saved ROIs — a lossless re-encode you can run locally; clips are written beside the source videos.