Resize your video for any app
Pick where it is going and we reframe it to fit. It runs in your browser, so your video stays on your device.
or drop it here
Up to 720p · no watermark
Editing on your phone?
The ClipSizer app for Android is on its way.
How it works
Choose your video
Drop a clip in or pick one from your device.
Pick where it is going
Choose TikTok, Reels, Shorts, Instagram or YouTube, then fit, fill or blur the background.
Save the result
Download the resized video. Up to 720p, no watermark.
TikTok video size (from TikTok's ad specs)
| Aspect ratio | 9:16 (vertical) |
|---|---|
| Smallest size | 540 × 960 |
Source: official help page, checked Oct 2026
Questions
Do you upload my video?
No. Everything is processed on your device, so your video never leaves your phone or computer.
Does it work on iPhone?
Yes, Safari on recent iPhones works. Long or 4K clips can be too big for the phone browser, so try a shorter clip or use a computer.
Is there a watermark?
No. Free exports have no watermark and go up to 720p on the short side.
What happens to the extra space?
You choose: fit the whole picture with bars, fill the frame by cropping, or fill the gaps with a blurred copy of your video.