Resize your video for an Instagram post
Make your clip the tall 4:5 shape the Instagram feed allows. 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 a video
Drop in a clip or pick one from your phone or computer.
Frame it at 4:5
The 4:5 shape is picked for you. Want a square post instead? Choose 1:1. Then fit, fill or blur.
Save your post
Download the video and add it to a new Instagram post. Up to 720p, no watermark.
Instagram feed shapes
| Tallest | 4:5 (1080 × 1350) |
|---|---|
| Widest | 1.91:1 (1080 × 566) |
| Width | Up to 1080 pixels |
Source: official help page, checked Oct 2026
Questions
Do you upload my video?
No. Your video is resized on your device and never uploaded. You post it to Instagram yourself.
Does it work on iPhone?
Yes, in Safari on recent iPhones. Long or 4K clips can be too big for the phone browser, so try a shorter clip or use a computer.
Why 4:5 and not square?
4:5 is taller, so it fills more of a phone screen. Instagram's help page gives 4:5 as the tallest shape for feed posts, though that page is written for photos. Prefer square? Choose 1:1.
What size is the finished video?
720 × 900 at 4:5, or 720 × 720 if you choose square. No watermark.
More free tools
Resize video
Crop your clip to a 1:1 square, or keep the whole shot on a blurred background. It runs in your browser, so your video stays on your device.
Resize video
Get a clip ready for Reels: full screen, nothing squashed. It runs in your browser, so your video stays on your device.
Compress video
Pick a target size and we shrink your video to fit it. It runs in your browser, so your video stays on your device.