Change video aspect ratio
Choose a video and a target shape. The whole picture can sit on a blurred copy of itself or on black or white bars, or it can be enlarged to fill the new frame with the edges cut off.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Choose a video file.
- Pick the new aspect ratio.
- Choose how to fit: Blurred background, Bars (black or white) or Fill (crop).
- Check the new size and the bar or cut size, then press Change aspect ratio.
How it works
The output frame has the chosen ratio. With bars or blur it is the smallest such frame that holds the whole picture, scaled so its long side equals the source’s long side; the picture is centred, and the rest is a plain colour or the same video enlarged, blurred and darkened. Fill enlarges the picture until it covers the frame and cuts what sticks out. Sides are rounded to even pixels.
Worked example
A 1920 × 1080 clip to 9:16 with bars: the frame is 1080 × 1920. The picture is scaled to 1080 wide, so it is 1080 × 9 ÷ 16 = 607.5 px high, leaving (1920 − 607.5) ÷ 2 = 656.25 px above and below. The tool shows “Bars of 656 px at the top and bottom”.
Tips
- Blurred background looks less empty than black bars on phones.
- Fill is the same as cropping to the centre; use the video cropper if the subject is not in the middle.
- A 4:3 or 21:9 frame from a phone video adds bars at the sides instead of the top.
Frequently asked questions
How do I make a horizontal video vertical without cutting it?
Choose 9:16 and Blurred background or Bars. The whole 16:9 picture is kept in the middle and the empty space above and below is filled with a blurred, darker copy of the video or a plain colour.
What size is the new video?
With bars or blur the long side of the source stays the long side of the result: 1920 × 1080 becomes 1080 × 1920 for 9:16 or 1920 × 1920 for 1:1. Fill crops the largest part of the source with the new shape, so a 9:16 fill of 1920 × 1080 is 608 × 1080.
Which ratio is right for which platform?
9:16 is the full-screen vertical format of phone stories and short videos, 1:1 is square, 4:5 is a tall portrait that many feeds show larger than square, and 16:9 is the standard widescreen of video players and TVs.
Is the video uploaded?
No. It plays and is recorded inside your browser tab; nothing is sent anywhere.