ENPTES

Resize a video without uploading it

Pick 480p, 720p, 1080p or type a width. The picture is scaled in this browser with FFmpeg and saved as MP4. The file never leaves this tab.

Runs in your browser Free No sign-up
  1. Choose file
  2. Set options
  3. Get result

Your file never leaves your device. Processed locally in your browser. Nothing is uploaded.

Re-encoding runs on your device's CPU in a single thread: expect roughly real time or slower (a 1-minute clip can take a minute or more).

How to resize a video

1. Drop the video and wait until the length shows. 2. Leave 720p, or pick 480p, 1080p or Custom and type a width. 3. Leave “Keep aspect ratio” and “Never enlarge” on unless you want a stretch or an upscale. 4. Press “Resize video” and download the MP4.

A new encode, not a crop

GustKit scales the whole frame. It does not cut the edges: that is Crop video. Sound is kept and re-encoded to AAC so the MP4 plays in more places. A very long clip is refused, because one browser thread would take too long.

Small files and tall phone video

“Never enlarge” leaves a 480p clip alone when you pick 1080p. Turn it off only when you really want a bigger frame. Phone video that was shot upright stays upright. The first visit downloads FFmpeg; later visits use the browser cache.

Frequently asked questions

Will 720p make a sideways video 1280 pixels wide?

The longer side is limited to 1280 pixels for 720p, 854 for 480p and 1920 for 1080p. A portrait clip gets the limit on its height.

Does the sound stay?

Yes, when the file has a soundtrack. A silent video stays silent.

Why is it slower than trimming?

Resize re-encodes the picture. Trim can copy the streams. Leave the tab open until the download appears.

Is the video uploaded?

No. FFmpeg runs in this tab.