Local browser video utility
Resize Video Online
Change video dimensions and aspect ratio without uploading the source file. Choose a common social format or enter custom output dimensions.
The full source is fitted inside the target canvas and padded when aspect ratios differ.
Your result will appear here
The browser loads the processing engine only when needed. Source files are not uploaded to GenVideoKit.
Processed output
Result
Local processing: source media stays in your browser. Large files can use substantial memory and may process slowly on older devices.
How to use Resize Video Online
- Choose a source video.
- Select the output canvas size.
- Resize and export an MP4 with the original image fitted inside the new canvas.
Related GenVideoKit tools
Frequently asked questions
Will the video be cropped?
The default mode fits the full source inside the target canvas and pads any unused area. This avoids cutting off the subject.
Can I create vertical video from horizontal footage?
Yes. Choose 1080×1920. The source is fitted into the vertical canvas, so you may see padding unless the source already matches the target shape.