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Social and Resize

Make a Square Video

Square videos look consistent across feeds, profile grids and ads. Fit the whole frame inside the square over a blurred background, or crop to fill 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 for Reels and Shorts

  1. 1

    Add the video

    Drop the video on the drop zone or choose it from your device.

  2. 2

    Pick the shape

    Choose 9:16 for Reels, Shorts, TikTok and Stories, 1:1 or 4:5 for feed posts, or 16:9 for YouTube.

  3. 3

    Choose the fit

    Blurred fill keeps the whole picture over a blurred copy, Crop to fill fills the frame (set Keep in view), Colour bars adds bars in your chosen colour.

  4. 4

    Set the resolution

    1080p is the standard for every platform; 720p makes a smaller file.

  5. 5

    Resize and download

    Press Resize video, follow the progress, then preview and Download.

Why use Aback Video for this

  • Blurred fill

    The look used by creators: the full landscape picture sits in the middle of a vertical frame over a soft blurred version.

  • Crop with focus

    When cropping, keep the left, centre or right of a landscape shot in view, or the top, centre or bottom of a tall one.

  • Platform sizes

    Output is exactly 1080 x 1920, 1080 x 1080, 1080 x 1350 or 1920 x 1080, the sizes platforms expect.

  • No upload

    Resized in your browser. The video stays on your device.

Frequently asked questions

Can I make a square video without cutting anything off?

Yes. Choose Blurred fill or Colour bars and the whole picture is kept inside the square.

What size is a square video?

1080 x 1080 pixels, or 720 x 720 if you pick 720p.

Which fit should I use?

Crop to fill when the subject stays in one part of the frame, such as a person talking in the centre. Blurred fill when everything in the frame matters, such as a landscape or a screen recording.

What size do Reels, Shorts and TikTok use?

All three use 9:16 vertical video, ideally 1080 x 1920 pixels.

Should I use 1:1 or 4:5 for Instagram posts?

4:5 takes up more of the screen in the feed, so it usually gets more attention. 1:1 is the classic square and is safe on every platform.

Will my video lose quality?

It is re-encoded to the new size at a high quality setting. If the source is smaller than 1080p, it is scaled up, which cannot add detail.

Is my video uploaded?

No. Resizing happens on your device with FFmpeg in WebAssembly.

Does it add a watermark?

No. Free tools never add a watermark.

Can I do this on my phone?

Yes. It works in mobile Safari and Chrome, though long videos take longer to encode on a phone.

Related tools

Crop Video

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

Split Video

Split a video into equal parts or fixed-length clips, downloaded as a ZIP.

Compress to Size

Fit a video under 10, 16, 25 or 50 MB. The bitrate is worked out for you.

Burn Subtitles

Burn an SRT, VTT or ASS file into the picture with your own style.

Resize Video

Change the resolution to 4K, 1080p, 720p, 480p or exact pixels.

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