Aspect ratio is the relationship between frame width and height. Changing it may require cropping, borders or repositioning. Stretching footage distorts shapes and should not be used as a shortcut.
Keep the source composition
A common landscape shape is 16:9, while phones and short-form placements often use portrait frames. The correct ratio depends on where and how the video will be watched.
Crop with a purpose
When adapting a frame, inspect the subject and action at every important moment. A crop that works in the opening shot may cut off a hand, subtitle or diagram later.
Use borders when needed
If the entire source must remain visible, letterboxing or pillarboxing may preserve the composition. Check the destination’s display behavior before choosing this route.
A practical checklist
- Identify the target aspect ratio.
- Preview crop boundaries across the whole clip.
- Reposition the subject if the editor supports it.
- Check captions and edge content on the final device.
Common mistakes to avoid
- Stretching a landscape clip into a portrait frame.
- Checking the crop only at the first frame.
- Placing text where controls or captions will cover it.
Questions people ask
What is the best aspect ratio?
There is no universal best. Use the ratio supported by your destination and planned viewer experience.
Will this site crop my video?
VideoCompact scales output dimensions proportionally; it does not offer custom crop framing.