Will the aspect ratio be kept?

Yes. The presets resize by height and keep the original proportions. With Custom, set just the width or just the height and the other side is worked out for you. Set both and the Fit option decides how the frame maps: contain letterboxes, cover crops, fill stretches.

Does resizing change quality?

Resizing re-encodes the video to H.264, so it isn't lossless. You get a standard MP4, and downscaling usually shrinks the file too.

It says my browser can't encode H.264. What now?

Some browsers (Firefox, mainly) have no built-in H.264 encoder. Open this tool in Chrome or Edge, which both ship one, and the resize works. Either way it runs on your device. Nothing is uploaded.

Resize Video

Scales a video down to a smaller resolution and keeps the aspect ratio intact.

What this does

Change a video's resolution while keeping the aspect ratio intact.

How it works

1Drop your video or pick it. It loads straight in your browser.
2Pick a 1080p, 720p, or 480p preset, or type a custom width and height.
3Click Resize video and download the new MP4.

Built with open source

Mediabunny — Converts and edits video and audio in the browser via WebCodecs. Add-on encoders cover MP3, AAC, and FLAC. · MPL-2.0

Frequently asked questions

Related tools

All Edit video →

Crop VideoCrop a video to a region you draw on the frame. Re-encodes the cropped area to an MP4 in your browser.Trim VideoCut a video down to just the clip you want with a start and end point.Mute VideoRemove the audio track from a video while keeping the original picture.