How to use Resize video
- Choose a video.
- Set the output width.
- Download the resized MP4.
What this tool does
The resize tool changes video width while keeping the original aspect ratio. It is useful when a 4K or 1080p source is larger than needed for email, chat, web previews, or classroom sharing.
Resizing can also improve compression because the encoder has fewer pixels to describe.
Supported formats and output
- Input
- Browser-readable video files.
- Output
- MP4 at the chosen width with proportional height.
Practical examples
Phone sharing
Resize a 4K clip to 720p before sending it in a message.
Web preview
Export a smaller MP4 for a page where the video appears in a modest embedded player.
Quality considerations
- 720p is often enough for casual sharing, while 1080p is better when detail matters.
- Avoid upscaling unless a destination requires exact dimensions.
Limitations
- This tool resizes; it does not crop to a new aspect ratio.
- Upscaling a small video will not create real detail.
- Very large files may fail because resizing requires decoding and re-encoding frames.
Frequently asked questions
Does this crop vertical video?
This tool resizes while keeping aspect ratio. Cropping presets for Reels, Shorts, and Stories can be added as a future feature.
What width should I use?
Use 1080 for high-quality social posts, 720 for smaller files, and 480 for quick sharing.
Troubleshooting
My vertical video still has the same shape.
That is expected. The tool preserves aspect ratio and does not crop vertical video into a square or landscape frame.
The result is still large.
Try a smaller width or run the resized file through the compressor.