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Social and Resize

Resize Video

Scale a video to a standard resolution or to exact pixel dimensions. Keep the aspect ratio and the other side follows, rounded to even numbers so every player accepts it.

  • Nothing is uploaded
  • Free, no sign-up, no watermark
  • Works offline once loaded

Drop a video here

or choose a file

MP4, MOV, WEBM, MKV, AVI, M4V, 3GP, FLV, WMV and more

Processed on your device. Nothing is uploaded.

How to use Resize Video

  1. 1

    Add the video

    Drop the video on the drop zone.

  2. 2

    Choose a resolution

    Pick a standard Resolution from 2160p to 240p, or Custom to type a Width and Height.

  3. 3

    Keep the proportions

    For custom sizes, leave Keep the aspect ratio (fit inside) on so the video is not stretched.

  4. 4

    Resize and download

    Press Resize video, compare the sizes, then Download.

Why use Aback Video for this

  • Standard sizes

    One click for 4K, 1440p, 1080p, 720p, 480p, 360p and 240p.

  • Exact pixels

    Type any width and height for a project, a website slot or a device screen.

  • Even dimensions

    Sizes are rounded to even numbers so every player and editor accepts the file.

  • Private

    Resized locally; your video is never uploaded.

Frequently asked questions

Does the resolution refer to the height?

It refers to the shorter side. A landscape 1080p video is 1920 x 1080; a vertical 1080p video is 1080 x 1920. This keeps phone videos from being scaled wrongly.

Will reducing the resolution reduce the file size?

Yes, usually a lot. Going from 1080p to 720p has less than half the pixels, and the encoder needs fewer bits.

Can I upscale a video?

You can choose a larger size, but upscaling cannot add detail that was not recorded. It can help when a platform requires a minimum resolution.

What if I turn off Keep the aspect ratio?

The video is stretched or squashed to fill exactly the width and height you typed. Use Resize for Reels and Shorts if you need a new shape without distortion.

Is my video uploaded?

No. Resizing runs in your browser with FFmpeg in WebAssembly.

Does it work on phones?

Yes. Downscaling is quicker than most edits, so it runs well on phones.

Related tools

Compress Video

Shrink a video's file size with simple quality presets.

Resize for Reels and Shorts

Make a video 9:16, 1:1, 4:5 or 16:9 with crop, blurred fill or colour bars.

Crop Video

Draw a frame on the video and keep only what is inside it.

Change Frame Rate

Convert to 60, 30, 25, 24 or 15 fps, by dropping or blending frames.

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