Online Video Resizer
Use Online Video Resizer, review the result, and keep the original until the output is checked.
How to use Online Video Resizer
- Select the video to resize.
- Choose an Aspect Ratio, or Custom, then type Width (px) and Height (px) - the lock keeps the ratio while you adjust one side.
- Fit keeps the whole picture and fills the leftover space; Zoom fills the frame and trims what hangs over.
- Pick Background for the filled area, then press Resize & Download to get resized-video.mp4.
What Online Video Resizer actually does to your file
Making a video larger adds pixels but no detail, so an upscaled clip stays soft - the honest use of this page is shrinking. A resized frame is re-encoded once, and dimensions are rounded to even pixel counts, so a target of 1000 px may land as 1000 or 1002. Fit never distorts the picture; if you need the exact frame filled without bars, use Zoom and accept the crop.
Online Video Resizer FAQ
What does Online Video Resizer do?
Adjust the resolution or aspect ratio of a supported video. Review the result and download the processed file.
Which files work with Online Video Resizer?
This category commonly supports MP4, MOV, AVI, MKV, WMV, FLV, WebM, and 3GP. Use the accepted file types shown in the uploader, because support varies by browser and by the engine behind each tool.
Will the aspect ratio be preserved?
Set both dimensions to the same kind of constraint, or lock the ratio. Choosing unrelated width and height values stretches the content, which is the most common cause of a distorted download.
Will my original file be changed?
No. The work is done on a copy in this tab by a WebAssembly build of ffmpeg, and the result arrives as a separate download, so your original is still there if you need it.
How is my file processed?
It is not uploaded. The processing is done locally by a WebAssembly build of ffmpeg, so the practical ceiling is your device's memory and the limit shown beside the uploader - no queue, no account, no copy on a server.
Is the Online Video Resizer free?
Yes. The Online Video Resizer is free with no trial limit, subscription, or watermark on downloads. You can use it for personal and commercial projects without creating an account.