Resize Video for Social

What resolution to expect

Cropping never enlarges, so the output takes the resolution of the part that is kept. A 1920 × 1080 landscape clip cropped to 9:16 becomes 608 × 1080, because only the centre third of the width remains; the platform then stretches it to fill a phone screen and it looks soft. Padding the same clip gives a full 1080 × 1920 frame with the picture across the middle.

Footage meant for vertical platforms is sharpest when it is shot vertically; cropping from landscape works best for 1:1 and 4:5, which keep more of the frame.

Leaving room for the app's buttons

On Reels, Shorts, and TikTok, the caption, account name, and buttons sit over the bottom and right-hand side of the video. Keep faces, text, and anything the viewer must read in the upper and central part of the frame. When padding a landscape clip, the bars above and below are space for a title in an editor, and a bar colour close to the footage's own tones looks less like a letterbox than black.

How to use it

1. Choose a video file.
2. Pick the aspect ratio and whether to crop or pad.
3. Resize and download the result.

Privacy & limitations

The video is read straight from your device and never uploaded. Everything — decoding, resizing, and encoding — happens in this browser tab, so large files are limited by your own memory rather than an upload queue. Encoding runs at playback speed because the browser records the video as it plays, so a two-minute clip takes about two minutes and the tab must stay in front. Cropping discards the edges of the frame permanently, so keep your original.