Change Video Aspect Ratio
Change a video's aspect ratio in your browser. Choose fit or fill, resolution, quality and audio.
Aspect ratio
Place a video into a new aspect ratio without it leaving your device.
Preview
No video selected yet.
Good to know
Good to know
The aspect ratio changer adapts a video to a new format such as 16:9, 9:16, 1:1, or a custom ratio directly in your browser. In “contain” mode, the entire image stays visible and bars may appear; in “cover” mode, the video fills the frame completely and is cropped, controlled via position X/Y and zoom.
Typical searches include change video aspect ratio, video 9:16, and make video square. A custom ratio can be defined via width and height as numerator and denominator. Filling can cut off image areas, while fitting creates bars — which mode fits depends on the image content and the target platform.
Typical use cases
Fill a landscape video for story formats
Use “cover” mode with position and zoom to bring a 16:9 video edge-to-edge into 9:16 without bars.
Keep the full picture without cropping
Choose “contain” when important content such as subtitles or graphics must not be cut off — bars appear at the edges instead.
Tips for better results
Adjust position and zoom in cover mode
Move the X/Y position and adjust the zoom to hit exactly the desired frame in cover mode.
Define a custom ratio for special formats
Enter custom values for width (numerator) and height (denominator) when none of the presets fit the target platform.
How it works
How it works
Step by step
Features
Features
Contain or cover
Choose between a fully visible image with bars or an edge-to-edge crop.
Controllable position and zoom
In cover mode, position X/Y and zoom can be adjusted for the desired frame.
Local processing
Your video never leaves your device; the adjustment runs entirely in the browser.
Frequently asked questions
Frequently asked questions
What's the difference between contain and cover?
Contain shows the whole image with possible bars; cover fills the frame completely and crops some image areas to do so.
Is my video uploaded?
No. The adjustment runs entirely locally in the browser, without transmission to a server.
More tools
More tools
Crop Video
Crop the visible frame area of a video locally in your browser and download the result as MP4 or WebM.
Change Video Resolution
Change a video's resolution proportionally in your browser. No crop, no stretching and no upload.
Video Compressor
Reduce video file size directly in your browser. Choose quality, target size, resolution, frame rate and audio with no upload.