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Change Aspect Ratio 4:3 Video to 16:9 for Widescreen Display

Hi all, I'm a newbie and tried to convert a 4:3 source video by setting the (display) aspect ratio to 16:9. The resultant video when played back does present itself as widescreen but unfortunately the actual image is incorrectly stretched. How would one go about converting the source video from 4:3 to 16:9 correctly? What programs would I need to do this without compromising the source video quality? Any feedback most welcomed, many thanks in advance.

It's well-known to all that the aspect ratio of a video means the ratio between the width and height of the image and the most common ratio are 4:3 and 16:9. Imagine if your 4:3 video is used to playback on a widescreen display device with 16:9, what would happen? No doubt, the image would be distorted and significantly affects the visual effect of videos. So when you plan to convert your 4:3 video for widescreen playback, to change a 4:3 video to 16:9 is seemingly a priority for all.

Part 1: How to Change Video from 4:3 to 16:9 with MacX Video Converter

The far-famed MacX HD Video Converter Pro for Windows or (Mac version ) lives up to its reputation to convert among HD and SD videos like AVCHD, MTS, MKV, MP4, MOV, FLV, AVI, WMV, VOB, MPEG, etc. while allowing you to change video aspect ratio such as from 4:3 to 16:9, 3:2 to 16:9 and vice versa without sacrificing any resolution or quality. Unlike the iMovie 11 or handbrake, this app changes 4:3 to 16:9 to make video content fill the entire screen, rather than the black bars adding to. Thus, you can watch video on wide screen in the proper (16:9) format.

Not only supporting you to convert a 4:3 video to 16:9 aspect ratio, it also aids you to adjust video resolutions, like convert 4K to 1080P, 1080P to 720P; improve frame rate, tweak 30p to 24p and boost audio to 320kbps/256/128, etc. Better still, it can transcode videos among SD and HD videos, incl. MP4 MOV AVI MKV FLV WMV 3GP, etc. and also provide you with 350+ preset profiles, like Apple iPhone iPad, Android Samsung Sony LG, Nokia, Huawei, Xiaomi, etc.

Then, how to convert aspect ratio 4:3 video source to 16:9 for widescreen display? Follow the steps below:

Step 1: Import the Video File

Free download this all-round video processing tool on Windows or Mac computer and then run it. Afterwards, import the 4:3 aspect ratio video file you want to convert by hitting the button at the top left corner.

video converter to convert video from 4:3 to 16:9 aspect ratio
video converter to convert video from 4:3 to 16:9 aspect ratio

Step 2: Choose Output Video Format You Want

Here includes over 180 video and 14 audio formats for you to pick and you can also pick to directly encode video to iPhone X/8/7, iPad Pro/mini 4 Retina, Galaxy Note/S8 edge, HTC 10, Sony, LG G5 and more.

change aspect ratio of 4:3 video file to 16:9
change aspect ratio of 4:3 video file to 16:9

Step 3: Set Parameter as 16:9

Click on the wheel-shaped button on the right, and then choose 16:9 aspect ratio from the pop-up window.

Step 4: Begin to Change 4:3 to 16:9

After selecting the place to store your output video file, press "RUN" to trigger the 4:3 video to 16:9 aspect ratio conversion on computer.

Part 2: How to Change Aspect Ratio of Video with iMovie

On top of the above method to convert video from 4:3 to 16:9, you can also resort to iMovie 11, the world-renowned aspect ratio converter. How to adjust video aspect ratio in iMovie 11? Check below!

1. Fire your iMovie 11 up. Followed by the slight click to select a project in the Project Library. After that opt for File > Project Properties.
The File menu appears in a light gray bar across the top of your computer screen.

2. Time for make a decision from the Aspect Ratio pop-up menu.
Widescreen (16:9) or Standard (4:3)

Of course, here you should choose the previous option, 16:9. Until now, the procedure of using iMovie to change 4:3 aspect ratio to 16:9 is done. You can try this solution if you have the only one need.

Part 3: List of 16:9 Aspect Ratio Screen Resolution

Do you know the aspect ratio of your computer, tablets and smart phones? If no, show you a simple technique-use the greatest common measure to divide the resolution and then you will get it. Here I gather a list of the widely-used 16:9 video resolutions, which are divisible by 8 and ranges from the standard definition to high definition.

16:9 Aspect Ratio Resolution (SD) Divisible by 8






16:9 Aspect Ratio Resolution (HD) Divisible by 8

1280×720 (720P HD)

1920×1080 (1080P HD)

2560×1440 (27" Monitor)

3840×2160 (4K UHD)

7680×4320 (8K UHD)