On the popping-up dialog, you will see several options regarding aspect ratio. To resize the video, click on “File” and then click on “Project Properties” on the drop-down list, a pop-up window will appear. Changing the dimensions of videos afterward may affect the editing procedures and effects applied to the video. It is better to adjust the video size before starting any other editing procedures. Open a pre-existing project in iMovie or create a new one. Learn to change the aspect ratio of videos in iMovie on Mac by following these simple steps: How to Change Aspect Ratio in iMovie on Mac? So, if you use iMovie for editing videos, and you want to know how you can change the aspect ratio of your content, read on to find it out. iMovie has to be one of the most popular editing software used worldwide. Several online editing tools are available on the market that you can use to change the dimensions of your content. To post that perfect video, it is better to resize it before posting it online. And if you post your content in its original dimensions it most probably be will get cropped in the wrong places and will diminish the quality of your video or image. Social media apps and websites require you post images and videos of a specific size. But it can also be changed afterward with the help of editing software. Some phones and tablets provide the option of changing your video’s aspect ratio before you start recording. The video’s original aspect ratio is based on the default settings of the recording device. However, for TikTok, the required aspect ratio is 9:16.

For example, for YouTube, the commonly used aspect ratio is 16:9, which is a standard for almost all videos. Different video posting platforms require different aspect ratios.

The ratio between the height and width of the screen or an image is called the aspect ratio.

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