How does a 16:9 become a 9:16?

Enter your video's size. See what each way of reframing keeps or adds, and copy the ffmpeg line that does it.

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Resize calculatorCalculated on this device
Your video

Shape 16:9

Make it

1080 × 1920 · TikTok, Reels, Shorts

Yours · the box is what a crop keeps
9:16 · the box is where it fits whole

  1. Crop to fill keeps 31.6 % of the picture

    Full screen, nothing added; the sides (or top and bottom) are cut. Move the crop with the x / y values.

    ffmpeg -i input.mp4 -vf "crop=606:1080:657:0,scale=1080:1920" -c:a copy output.mp4

  2. Fit with bars 68.3 % of the screen is bars

    The whole picture, 1080 × 608, on black.

    ffmpeg -i input.mp4 -vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black" -c:a copy output.mp4

  3. Fit over a blurred copy no black bars

    The whole picture in the middle, the bars filled with a blurred, zoomed copy of itself.

    ffmpeg -i input.mp4 -filter_complex "[0:v]scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920,boxblur=30:5[bg];[0:v]scale=1080:1920:force_original_aspect_ratio=decrease[fg];[bg][fg]overlay=(W-w)/2:(H-h)/2" -c:a copy output.mp4

Watch an example

13 seconds · a made-up example

In the studio's Clips mode, a wide recording becomes a vertical short.Join the beta

How it works

Short and checkable: every limit links to the platform's own page, read on 28 Oct 2026.

  1. Crop to fill

    The largest part of your picture with the new shape, centred, scaled to the new size. Full screen, nothing added — but from 16:9 to 9:16 you keep under a third of the picture.

  2. Fit with bars, or over a blur

    The whole picture, scaled to fit, with bars where it doesn't reach. The blurred version fills those bars with a zoomed, blurred copy of the same video.

  3. Commands you can run

    Each way comes with its ffmpeg line, sizes already worked out and kept even (video encoders need even numbers). ffmpeg is free and runs on your own computer.

What it doesn't do

  • It doesn't follow faces: the crop is centred; move it by changing the x / y values in the command.
  • The commands copy the sound as it is and re-encode the picture with ffmpeg's default settings.
  • There is no file here, only numbers.

Questions

How do I turn a 16:9 video into 9:16?

Either crop: keep a 9:16 window of the picture (from a 1920 × 1080 video, a 608 × 1080 band, about a third of the width), or fit: shrink the whole picture and fill the rest with bars or a blurred copy. The tool gives the ffmpeg line for each.

What resolution is 9:16?

1080 × 1920 is the usual size for TikTok, Reels and Shorts; 720 × 1280 is the smaller one.

Crop or fit, which is better?

Crop when the subject stays in the middle; fit when everything in the frame matters, like a screen recording.

More free tools

All 25 tools

Made for vertical from the start.

Vertiscale edits every video for 9:16: an upright clip fills the screen, a landscape one sits over a blurred copy of itself.

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