Make a video square
Turn a wide or tall video into a 1:1 square. Crop the middle to fill it, or fit the whole picture with black bars.
Your file stays on your device. Nothing is uploaded.
How to resize a video
- Choose your video.
- Pick the shape: 9:16 for Reels, TikTok and Shorts, 4:5 for the Instagram feed, 1:1 for a square, 16:9 for YouTube.
- Fill the frame (the sides or top are cut off; the preview shows what stays) or show everything with black bars. Then press "Resize video".
Which shape for which app
Phones show vertical video full screen, so a 16:9 clip from a camera wastes most of the screen on Reels, TikTok and Shorts. Cropping the middle to 9:16 fills it. If the important part is at the edge, use black bars instead so nothing is cut.
| Where | Shape | Size we make |
|---|---|---|
| Instagram Reels, TikTok, YouTube Shorts | 9:16 vertical | 1080 × 1920 |
| Instagram feed post | 4:5 | 1080 × 1350 |
| Square post | 1:1 | 1080 × 1080 |
| YouTube, TV, computer | 16:9 | 1920 × 1080 |
Sources: Instagram Help: Reel size and aspect ratios, Google Ads Help: YouTube Shorts asset specs
Size and quality
We make the result at most 1080 pixels on its short side, the size these apps show, and never bigger than your video: a 720p clip stays 720p sharp instead of being blown up. The sound is kept as it is. The video is encoded as H.264 MP4, which every app accepts.
Your videos stay on your device
Nothing is uploaded. Resizing runs in your browser, so it works for private clips and without waiting for an upload.
FAQ
Frequently asked questions
Short answers about how this tool works on your device.
Will a square video look right on every app?
Yes. Square videos show without bars in feeds on Instagram, Facebook and X, and on phones held either way.
Can I choose which part stays when cropping?
Not yet: the crop keeps the middle of the picture. If your subject is at the side, choose "Show everything" so nothing is cut off.
Are my videos uploaded?
No. Everything runs in your browser, so your videos stay on your device. Nothing is uploaded.
Is Snipmill free?
Yes. Snipmill is free to use and needs no account.
Is there a watermark?
No. We never add a watermark.