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Best video editing tool to customize the aspect ratio
  • Various aspect ratios available: 1:1, 9:16, 16:9, 4:3, 21:9
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Change Aspect Ratio Between 16:9, 9:16, 4:3, 1:1 (Windows 10 Included)

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Jun 25, 2021• Proven solutions

Before reading this article, you may ask:

What is Aspect Ratio?

The term Aspect Ratio refers to the relationship between the width and height of a video, which is expressed normally in the form of "width: height", for example, 4:3 or 16:9, and it is irrelevant to the actual physical size of the image.

The most common video aspect ratios are 4:3 (1.3:1) and 16:9 (1.78:1). The former is the standard TV format, while the latter is the latest widescreen TV format. Besides these two, 1:1 and 9:16 are getting popular on social media sharing nowadays.

As far as you may know, many media players enable you to change the aspect ratio in real-time when playback. Yet the change is temporary. Next time you open it, you need to change the aspect ratio again. Besides, you may also need to convert a portrait video to landscape or convert the default 16:9 YouTube videos to sharing on IGTV (9:16) or other platforms.

Changing the aspect ratio of videos will provide you plenty options and in this article, we will share with you how to change the aspect ratio between 4:3, 16:9, 1:1 and 9:16.

Part 1: Choose the Right Video Editor

To change the aspect ratio permanently, you need a video editor or converter. Here I humbly recommend Wondershare Filmora9 video editor (the latest version 9 of Filmora video editor, Windows 10 supported), which lets you create both 4:3, 16:9, 9:16 and 1:1 aspect ratio videos easily. You can share the created videos on Apple TV, YouTube, Vimeo and mobile devices conveniently.

The video tutorial below shows how to fix the black bars in YouTube video by changing aspect ratio. You can download the Free Trial version of Filmora9 to follow.

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Note: Since this video is made with previous Filmora9 version, I’ve updated the latest steps of the changing aspect ratio in Filmora9 below.

Part 2: How to Change Aspect Ratio in Filmora9

Method 1: Change aspect ratio at the Starting interface

The Filmora9 allows you to change the project aspect ratio after launching the video editor program. Click the drop-down menu and you will see the commonly used 16:9, 1:1, 9:16, 4:3 and 21:9 aspect ratios.

choose aspect ratio

(Update to the latest Filmora9 version if you didn't see this option)

Method 2: Change Aspect Ratio under Project Settings

If you like, you could choose a target aspect ratio at the beginning after entering the main editing interface by clicking the Project Settings. It depends on the aspect ratio of your media source.

If most of your media source files are in 4:3 aspect ratio, you should select 4:3 standard aspect ratio. For you've select an aspect ratio, then the media files that are in 16:9 or other aspect ratio will be converted with black bar, and be stretched if necessary. This is the solution when aspect ratio discordance occurs. But if you just want to change aspect ratio of one video file, simply choose an aspect ratio and go.

If you want to change aspect ration later, just select Project Settings to change it again.

choose aspect ratio

Method 3: Change Aspect Ratio during Editing

After importing video files into Filmora9 timeline, you can still change the aspect ratio at the Crop and Zoom tool.

Right click on cilp in timeline to select Crop and Zoom . Then a pop-up window will appear. By clicking manually, 16:9, 4:3, 1:1 and 9:16 at the bottom, you can change aspect ratio with these presets or click Custom to enter the aspect ratio manually. After selecting, click OK. Then you will find aspect ratio will change.

change aspect ratio in Crop&Zoom interface

Optionally, you can edit and enhance your video with plenty of fitlers, overlays, visual effects, titles and all common video editing tools.

add background blur in 9:16 cropped video

Method 4: Change Aspect Ratio at Exporting

Depending on your needs, you can either save your videos to computer for media player or mobile device, directly upload to YouTube, or burn to DVD for watching on standard or wide screen TV. To do so, click "Export" button when you are happy with your video.

change aspect ratio

    1. Change aspect ratio for local computer

The first tab is "Local", which you can save video in specified aspect ratio to computer. Once a format is selected, all resolutions with different aspect ratios are available. Depending on the resolution, the output video aspect ratio is different. For example, 1280x720 is a 16:9 video, but 640x480 is a 4:3 video. Or input 480x480 to customize 1:1 video. You could calculate the aspect ratio yourself. Always change aspect ratio to the same with your choice at the beginning. Otherwise, black bars may be added.

    1. Change aspect ratio for device

Switch to "Device" tab to save your video in formats that are compatible with all popular devices, including iPhone, iPod, iPad, PSP, etc. When you've chosen a device, all resolutions with optional aspect ratio will be given. Simply choose your favorite resolution from the list. The higher, the better video quality, but also larger file size.

    1. Change aspect ratio for YouTube

Go to "YouTube" tab and type in your information before clicking the "Export" button. There is no need to select an aspect ratio for second time. Your videos will be directly uploaded to YouTube depending on your select at the beginning.

    1. Change aspect ratio for DVD TV

It's easy to switch aspect ratio for TV between 4:3 and 16:9. When you're in the "DVD" tab, you'll see an aspect ratio option. Simply choose what you want depending on your TV's screen.

Part 3: Why aspect ratio is important for video editing?

The aspect ratio is an ideal value to obtain excellent resolution for images and videos. If you take a deeper note on aspect ratio in video editing you will find out there are multiple aspect ratio options are available for you to select as per your needs. The aspect ratio takes the control of height, width and resolution attributes of a video and image.

Part 4: What is the right aspect ratio for different social media platforms?

Every social media platform carries a unique aspect ratio to position the videos and images perfectly within the screen. If you are making use of social media platform then you must learn about the aspect ratios of these platforms for optimum usage.

The right aspect ratio for different social media platforms respectively

  • YouTube

The ideal aspect ratio of YouTube is 16:9 Even if you upload videos with different aspect ratio, the YouTube environment has a built-in setting to convert the uploaded videos into the standard aspect ratio automatically.

  • Facebook

Facebook follows the aspect ratio of 16:9. The images take this aspect ratio automatically when you post the videos on this environment.

  • Instagram (including IGTV) 

You can upload files on Instagram with the aspect ratio between 1.91:1 and 4:5

  • Twitter

Here, Twitter accepts the aspect ratio between 2.1 and 1.1

  • Vimeo

The standard aspect ratio is 16:9 but it gives the option for filmmakers to upload files with 4:3 ratios.  


Above are the ways that I figured out on changing aspect ratio in Filmora9. Of course, there are many other free video editing software available for changing the video aspect ratio, share it on the comment below.

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Liza Brown
Liza Brown is a writer and a lover of all things video.