The wrong frame size ruins an otherwise good video: black bars on phones, cropped heads on widescreen, or a file rejected by the platform. This free video resizer changes the frame dimensions in your browser, so the file never leaves your device and no signup is needed. Set a width, a height, or both, and the tool keeps the picture’s shape while it scales. The honest limits: stretching is avoided by design, so the output keeps the source aspect ratio unless you choose otherwise.
How to use this video resizer
From the wrong frame size to the right one, in three steps.
Choose a .mp4, .mov, .webm or .mkv file. The tool checks it is a video file before it starts.
Enter a width, a height, or both. The tool keeps the picture’s shape while it scales.
The resized file downloads with the same base name, ready to share or upload.
Why resize a video
The wrong frame size ruins an otherwise good video: black bars on phones, cropped heads on widescreen, or a file rejected by the platform.
Square for feeds, vertical for stories, widescreen for players: the right frame size for each destination.
The tool keeps the picture’s shape while it scales, so nothing looks stretched or squashed.
Upscaling a small video cannot add detail that was never there, so results look soft beyond the source size.
The re-encode runs on your own device, so personal clips never leave your browser.
Video Resizer FAQs
Short, direct answers to the questions readers ask most.
No. The tool keeps the picture’s shape while it scales, so nothing looks stretched or squashed.
Yes. Set a width, a height, or both, and the tool keeps the picture’s shape while it scales.
No. Only the frame dimensions change; the duration, frame rate and audio stay the same.
No. Upscaling a small video cannot add detail that was never there, so results look soft beyond the source size.
Yes. It runs entirely in your browser, with no account, no signup, and nothing uploaded.
Related Tools
More free video tools that work the same way — right in your browser.
Shrink a video to a smaller MP4 you can send or upload.
Video RotatorFix a sideways or upside-down video, in your browser.
Video Speed ChangerChange video speed in your browser, with no upload and no signup.
Video to GIF ConverterTurn a short video clip into a GIF, in your browser.
Try the related tools above, or go back to the Convertion homepage for more free converters.
