The Video Change
100% LocalNo upload

change video aspect ratio

Change Video Aspect Ratio

Resize a video for TikTok, Instagram, YouTube, square posts, and presentation-friendly formats.

No upload No watermark Free, no signup
Quick target size
Advanced controls for resolution, audio, trim, and aspect ratio unlock after upload.
ResolutionAudioTrimAspect ratioOutput format

Coming next

More video tools

Convert

Change video formats when the converter is ready.

Trim

Cut clips down to the part you need.

Resize

Change resolution and dimensions.

Crop

Reframe videos for social posts.

Extract Audio

Pull audio from video files.

Your privacy is the product rule.

Compression runs locally in your browser today, and future tools should keep that same no-upload default whenever possible.

Learn more

How to use this tool

  1. Upload one video.
  2. Choose 16:9, 9:16, 1:1, 4:5, or 4:3 and select crop or fit with padding.
  3. Compress and download the resized video.

Resize for TikTok, Instagram, YouTube, and square posts

Use 9:16 for vertical clips, 1:1 for square posts, 4:5 for portrait feeds, and 16:9 for widescreen video.

Crop vs fit with padding

Crop fills the frame and may cut edges. Fit with padding keeps the full video visible and fills extra space with your background color.

Browser-based compression and privacy

The video file is handled in your browser session. The compression engine runs locally, so the file is not uploaded to a server and no watermark is added.

Supported formats

The first version accepts MP4, MOV, and WebM files up to 500MB. Files from 200MB to 500MB can be processed, but the page warns that browser memory and processing time may be a limit.

FAQ

How do I make a video 9:16?

Open the aspect ratio panel, choose 9:16, then select crop or fit with padding.

Can I make a square video?

Yes. Choose 1:1 and export as MP4.

Will crop remove parts of the video?

Yes. Crop to fill may cut the edges. Use fit with padding if you need the entire original frame visible.