Resize Video

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Resize video online — change the resolution or aspect ratio for YouTube, Instagram and TikTok. Scale your MP4 in seconds.

Drag & drop a video here, or click to browse

Accepted: MP4, MOV, WEBM, MKV, AVI, M4V. Up to 20 MB.
×
One dimension keeps the aspect ratio; both dimensions crop to fit.
Framing preview
Original — — New size
Larger than the source — the result may look soft.
Upload a video to see exactly what the new frame will keep.
The whole frame is kept and scaled to the new size. Click the video to play or pause it.
Resizing the video… this can take a moment.
Your resized video is ready

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How it works
1
Upload a video — MP4, MOV, WEBM, MKV, AVI or M4V.
2
Pick a size and check the framing preview — dimmed areas will be cropped away.
3
Resize it — you get an MP4 (H.264) at the new size, with the audio untouched.
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About Resize Video

Resize Video changes a clip’s resolution or aspect ratio for wherever it is headed. Presets cover 1080p, 720p and 480p (all keeping the original aspect ratio), a 1080×1080 square center crop for Instagram, and a 1080×1920 vertical crop for TikTok, Reels and Shorts — plus a custom mode for exact pixel dimensions.

A framing preview shows precisely what the new frame keeps: dimmed areas will be cropped away, and for crop presets you can drag the bright window to choose which part of the picture survives. Setting one custom dimension scales while preserving the aspect ratio; setting both crops to fit.

The video is scaled on the server into an H.264 MP4 with the audio passed through untouched. Resizing is free, and the page warns you when your target is larger than the source, since upscaling can look soft.

How to use Resize Video

  1. Upload a video — MP4, MOV, WebM, MKV, AVI or M4V.
  2. Pick a size preset, or choose Custom and enter a width and/or height.
  3. For square or vertical crops, drag the bright window to frame the subject.
  4. Review the framing preview — dimmed areas are cropped away.
  5. Click Resize video and download the MP4 at the new size.

Frequently asked questions

Pick the Vertical 9:16 preset — it center-crops to 1080×1920, and you can drag the framing window so your subject stays in shot. The result is an MP4 ready for TikTok, Reels and Shorts.

Neither happens blindly. The 1080p/720p/480p presets scale the whole frame with its original aspect ratio; square and vertical presets crop, and the preview dims exactly what will be cut so there are no surprises. Nothing is ever stretched.

Yes. In Custom mode, entering just a width or just a height scales the video proportionally; entering both crops the frame to fit those exact pixels.

You can, but the tool warns you: upscaling cannot invent detail, so the result may look soft. It is usually better to keep the source resolution or go smaller.

Resizing is free. Only the picture is rescaled — the audio track is carried over untouched, and the output is a standard H.264 MP4.
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