# Reframe a landscape video for vertical screens

> Convert a 16:9 video to 9:16, 1:1 or 4:5 for Reels, Shorts and TikTok. Face tracking moves the crop with the people, so nobody is cut off. Runs on your device.

URL: https://nibbo.org/en/reframe-video/

## How it works

1. A small face detector (YuNet, about 230 KB) scans frames a fifth of a second apart and links the faces into tracks. Click a face to stop following it.
2. From the tracks, the window path is planned like a camera operator would move: it ignores small head movements, pans with an ease-in and ease-out when someone walks, and cuts with the shot instead of sweeping across it.
3. Choose Follow for a moving window, Fixed for one still window where the people spend most of the clip, or Centre for a plain crop. Zoom in to frame a face closer.
4. Every frame is then cropped and encoded again on your device with WebCodecs (H.264 in MP4). Audio is kept. A 1080p clip becomes 608×1080; 4K becomes 1216×2160.

## Questions

### Is the video uploaded?

No. The detector and the video encoder run in this tab. The only download is the detector itself, once; after that it works offline.

### Why not just crop the centre?

In most interviews, vlogs and talks the person is off-centre, or two people sit at the sides. A centred crop cuts them off. The window here goes where the faces are.

### What if no face is found?

The window stays centred and the page says so. Try the thorough scan for small or distant faces, or choose Centre to crop a clip with no people in it.

### Which files work?

MP4, MOV and M4V videos your browser can play, up to 3 GB. Browsers without WebCodecs, or clips they cannot decode, go through the FFmpeg engine instead, which downloads once and is slower.

### Can I pick the window by hand?

Not yet. Switch off the faces you do not want followed, use Fixed for a single still window, or zoom in and out. Hand-placed keyframes are planned.

## Why Nibbo

- Runs on your device, nothing is uploaded
- No sign-up, no watermark
- No queue and no daily limit
- Works offline once opened
- Free for files up to 3 GB
- [Nibbo vs Canva, iLovePDF, Smallpdf](https://nibbo.org/en/guides/nibbo-vs-canva/)