Free Video Aspect Ratio Resizer
Resize any video for Reels, Shorts, square posts and widescreen with a blurred background, bars or a crop.
Private by design: your files are processed in your browser and never uploaded.
How to use the Video Aspect Ratio Resizer
- Add your videoChoose a video from your device.
- Choose ratio and fitPick 9:16, 1:1, 4:5, 16:9 or 4:3, then a blurred background, bars or crop.
- Create and downloadYour browser records the new version. Download it when it finishes.
About this tool
Each platform prefers a different shape. Reels, Shorts and TikTok use 9:16, feed posts often use 4:5 or 1:1, and YouTube uses 16:9. A blurred background keeps the whole picture visible without ugly black bars, while crop fills the frame by trimming the edges.
The video plays once in real time while your browser records the new version, so a one minute video takes about one minute. The result is an MP4 when your browser supports it, otherwise a WebM. After resizing, add captions with the subtitle and SRT generator or turn a moment into a loop with the video to GIF maker.
Frequently asked questions
Why does it take as long as the video?
Your browser re-records the video as it plays. This keeps your file on your device, but it runs at normal playback speed.
What file format do I get?
MP4 when your browser can record it, otherwise WebM. Both play on phones and computers, and both can be uploaded to social apps.
Will the audio be kept?
Yes, leave Keep audio ticked. Untick it to export a silent video.
Which ratio is best for Reels and Shorts?
Use 9:16. It fills a phone screen from top to bottom.