Video Resize

Change the dimensions of a video while maintaining the aspect ratio

Free Video Resizer — Change Video Resolution Online

ezyimg's Video Resizer lets you change the resolution of any video to 4K, 1080p, 720p, 480p, or a custom width — all processed locally in your browser. Reduce video resolution to shrink file sizes or upscale for better playback on large screens.

How to Use

  1. 1

    Upload your video

    Drop an MP4, WebM, MOV, or other video file into the upload area.

  2. 2

    Choose a resolution preset or custom width

    Click a preset (4K, 1080p, 720p, 480p, 360p) or drag the width slider to a custom value.

  3. 3

    Choose output format

    Select MP4 (H.264) for compatibility or WebM (VP9) for web streaming.

  4. 4

    Resize the video

    Click Resize. Height is calculated automatically to maintain aspect ratio. Processing runs in your browser.

  5. 5

    Download the resized video

    Compare before and after file sizes, then download the resized video.

Tips & Best Practices

  • →720p (1280px) is the best all-around size for social media and web sharing.
  • →Downscaling from 4K to 1080p can reduce file size by 50–70% with minimal visible quality loss.
  • →Use 480p for videos intended for mobile viewing where bandwidth is limited.
  • →The Maintain Proportion checkbox ensures width and height scale together to avoid distortion.

Frequently Asked Questions

How do I change video resolution online for free?

Upload your video to ezyimg's Video Resizer, select a resolution preset (e.g. 720p) or enter a custom width, then click Resize. The video is re-encoded in your browser at the new dimensions.

How do I compress video by reducing resolution?

Reducing video resolution (e.g. from 1080p to 720p) is one of the most effective compression techniques. Lower resolution means fewer pixels per frame, which directly reduces file size.

What is the difference between 1080p and 720p for video?

1080p is 1920x1080 pixels (Full HD) and 720p is 1280x720 pixels (HD). 720p files are typically 40–60% smaller than 1080p at the same bitrate, with only a small visible quality difference on most screens.

Does resizing a video affect quality?

Scaling down reduces the number of pixels, which means some detail is lost. For most casual use, downscaling from 4K or 1080p to 720p is barely noticeable. Scaling up adds pixels via interpolation and may look softer.

Can I upscale a low-resolution video?

Yes, but the tool uses standard Lanczos scaling — it does not use AI upscaling, so the result will look smoother but not sharper than the original low-resolution source.