How to change video aspect ratio from 16:9 to 4:3 on computer?

16:9 and 4:3 are the two most popular video aspect ratios. 16:9 has become the most common aspect ratio for televisions and computer monitors, because it is wider, ideal for widescreen display. Most online videos, such as YouTube and Vemio videos are in this standard format. A lot of smartphones can record videos in 16:9 aspect ratio, like iPhone, Samsung galaxy phones, Nexus, Motorola, etc. In a previous post, we discussed how you can change video aspect ratio on Samsung galaxy phones. You can check it out now if interested. Today, we will share a quick method to alter video aspect ratio from 16:9 to 4:3 on Mac and PC computers.

How to change video aspect ratio from 16:9 to 4:3 on computer?

You need a video converter for this job. We recommend Video converter ultimate for Mac and Windows, very powerful and easy to use. You can get it now for free below.

Just like many other media converters, to edit videos with it, you firstly need to import source video shots into the converter, then choose output settings, finally convert source video according to the settings and parameters you have selected. Drag the video clips to the media converter, you will see a screen like below. We are using the video converter for Windows on a PC in this demo. The Mac version differs slightly in appearance.

convert and edit videos on computer

Besides each video clip, you can see an Edit button. Click on it to open the video editing window as below. Make sure to switch from Trim to Adjust tab. On the right side, you can find the Aspect Ratio option. The original resolution is selected by default. Click on it to expand the drop-down menu, you can find 16:9 aspect ratio, 4:3 aspect ratio and other items like Letterbox, Pan & Scan, Full Screen. In this demo, we are using a 1024*576p video with 16:9 aspect ratio. You can see it fills the whole video player window.

change video aspect ratio from 16:9 to 4:3

Once you have changed video aspect ratio from 16:9 to 4:3, you can preview the output video as below. The video becomes thinner and narrower in the preview. You can play the whole video which was originally in 16:9 aspect ratio now in new 4:3 aspect ratio. Once you are satisfied with the change, click OK button to save and return to the main interface of the video converter.

preview video in 4:3 aspect ratio

Now you can scroll back to the first screenshot above. To convert video aspect ratio from 16:9 to 4:3 is just one click away. You can simply click on the Convert button, then the video with new aspect ratio will be created and saved to the output folder of this video computer. However there are some settings you may like to change, such as the output video format. You can keep the output video format the same as the original video or choose a new output video format that is compatible with the target device you like to play the video with. Find out more details about this topic from this video aspect ratio conversion guide for Mac and Windows.

In fact, an easier way to convert videos for certain players or devices would be choosing the output format by device name. In this way, you can quickly select optimized video profile for the output video, so you do not need to manually customize video aspect ratio, video format, video codec, video resolution or else. It will be automatic. For example, if you are going to play the video on mobile phones, you can refer to this guide to convert videos to iPhone, convert videos to Samsung phones.

Note that video aspect ratio is different from video resolution. To edit video resolution, you can click on the Settings button from the right lower section to open the video setting window as below. Changing video resolution is very easy to follow from here. You can easily upconvert video to HD, full HD, UHD or down convert video to SD or any other resolutions or sizes you like.

change video resolution settings