Resize Video
Runs in your browser — your files are never uploaded.
Scale a video to a different resolution. Enter one dimension and leave the other blank to keep the aspect ratio — the free side is computed and snapped to an even number, which is what stops the export failing on videos whose proportions do not divide neatly. Give both and the video is stretched to fit exactly, which is occasionally what you want and usually not.
How to use Resize Video
- 1
Drop your video onto the box, or click to choose one.
- 2
Enter a target width, and leave height blank to keep the proportions.
- 3
Click “Convert” to save the resized MP4.
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Frequently asked questions
How do I resize without stretching?+
Fill in one dimension and leave the other empty. The missing side is calculated from the original aspect ratio and rounded to the nearest even number. Filling in both forces the video into that exact shape, which distorts it unless the ratio happens to match.
Why must the dimensions be even?+
H.264 stores colour at half resolution horizontally and vertically, so an odd width or height has nowhere to put the last row or column. ffmpeg refuses rather than guessing. Every dimension here is snapped down to even automatically.
Can I make a video bigger?+
You can, but it will not add detail — upscaling stretches the pixels that are there and usually looks softer than the original at the same viewing size. Scaling down is where this is genuinely useful.
Should I resize or compress?+
To make a file smaller, compressing usually costs less quality than resizing for the same saving. Resize when the target genuinely needs different dimensions — a specific upload limit, a display, or an ad format.