Resize MP4
Resize an MP4 without uploading it.
Choose an MP4, set output width and height, and create a resized MP4 in your browser.
Resize MP4
Set dimensions and output MP4.
Your selected video is processed in this browser tab. It is not uploaded to a conversion server.
Ready.
MP4 resize keeps compatibility
This tool creates a new MP4 at the dimensions you choose. It keeps the source aspect ratio by fitting inside the target canvas and padding when needed.
Best settings and limits
Best first try
Use 1280 x 720 for a normal widescreen MP4. Use 1080 x 1080 only if square padding is acceptable.
When this may fail
If you need to remove edges or fill a square frame, use Crop video instead of resize.
Privacy boundary
The selected video file stays on your device while the tool creates the output.
Frequently asked questions
Can I resize MP4 without uploading?
Yes. The MP4 is processed locally in your browser.
Does the output stay MP4?
Yes. The download is a resized MP4 file.
Why did the file size change?
Resize also re-encodes the video, so file size depends on resolution, duration, motion, and encoding settings.