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Resize Video for Instagram, Reels, YouTube and WhatsApp

Fit any video to 9:16 (Reels, Shorts, WhatsApp status), 1:1, 4:5 or 16:9, with a blurred or coloured background, or cropped to fill. Saves an MP4. Nothing is uploaded.

Private · on device. Runs in your browser: your file is not uploaded. No sign-up.

MP4, MOV (iPhone), MKV, WebM, AVI or 3GP, up to 2 GB

How to resize a video for social media

  1. Choose the video and the shape: 9:16, 1:1, 4:5 or 16:9.
  2. Choose how it fits: blurred background, a colour, or fill.
  3. Check the preview, press Make it, and download the MP4.

Video lying on its side? Rotate it first. Too big to send? Use compress video afterwards.

The engine behind this tool

Video and sound are processed by FFmpeg, the open-source engine behind most of the world's video software, compiled to run inside your browser as ffmpeg.wasm. It is downloaded from this site (about 31 MB) the first time you use a video or audio tool, and your browser keeps it for next time. FFmpeg and ffmpeg.wasm are free software, licensed under the GNU General Public License version 2 or later; their source code is at github.com/ffmpegwasm/ffmpeg.wasm.

Frequently asked questions

Which shape do I need?

9:16 (tall) for Instagram Reels and Stories, YouTube Shorts, TikTok and WhatsApp status. 1:1 (square) or 4:5 (slightly tall) for posts in the Instagram and Facebook feed. 16:9 (wide) for YouTube and most screens.

What is the difference between the background and Fill?

With a blurred or coloured background, the whole video is kept and the empty space around it is filled. Fill (crop) enlarges the video until the shape is full, so the edges that do not fit are cut off.

Is my video uploaded?

No. The video is redrawn in the new shape on your own device by FFmpeg running in this browser tab.

Will a small video look sharper at 1080?

No. A video is never sharper than it was filmed; 1080 only matches what the apps show. If your video is small, 720 gives the same look in a smaller file.

Why does it take a while?

Every frame is drawn again and re-encoded on your device, using one processor thread in the browser. A one-minute phone video can take a few minutes on a phone; a short clip is quick.