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

Here's guide of how to convert video aspect ratio from 4:3 to 16:9 for widescreen display on Windows (10/8/7)/Mac.

If you have recorded some videos using 4:3 aspect ratio, you may find that they are not suitable for widescreen TVs, or uploading to YouTube, other media. When you play the fullscreen 4:3 videos on a 16:9 widescreen, it will result in distorted images. To play the 4:3 videos clearly, you can either utilize monitors with the same 4:3 aspect ratio, or change the aspect ratio from 4:3 to 16:9.

In this post, we'll show you how to convert a 4:3 video to a 16:9 file, whether you want to keep the whole width, avoid stretching, letterbox or pillarbox...

How to convert 4:3 to 16:9 aspect Ratio
Aspect Ratios

Easily Convert Aspect Ratio from 4:3 to 16:9 for Widescreen

WinX HD Video Converter Deluxe - an excellent aspect ratio converter that will change aspect ratio for widescreen HDTV, computer monitors, smartphones, social media, etc., like from fullscreen 4:3 to 16:9 widescreen, 16:9 to 4:3, 1:1, 1.85:1, etc. High quality without stretching or squashing. Easily convert videos from 4:3 to 16:9 aspect ratio for widescreen display as you need:

  • Change the video aspect ratio settings from 4:3 to 16:9, 16:9 to 4:3, 21:9, etc. in the parameters.
  • Crop the top and bottom of a video to change the dimensions to widescreen aspect ratio or whatever you want.
  • Resize a video by upscaing a 4:3 resolution to widescreen 16:9 resolution, like from 640x480 to 1280x720, or 1280×960 to 1920x1080.
  • Convert videos among MP4, HEVC, AVI, MOV, MKV, any formats; compress large videos to smaller; edit, download, and more.

Part 1 How to Convert Video Aspect Ratio from 4:3 to 16:9

To change video aspect ratio to widescreen, like from 4:3 to 16:9 without pillar box or letter box, follow the guide below. First, free download the aspect ratio converter:

Free download Windows version
Free download MacOS version

Step 1: Load the video

Launch the video aspect ratio converter and click the big "+" icon in the middle. Or click the "+Video" button on the top to import the fullscreen 4:3 video file from your computer.

Step 2: Choose an output format

Choose a desired output video format. You can convert the source video to MP4, H.264, HEVC, AVI, MKV, AVC, WMV, MPEG, etc., or just choose a ready preset for TV, YouTube, Facebook, iPhone/iPad/Apple TV, Android, Xbox, etc.

16:9 to 4:3 Aspect Ratio converter
Convert Video Aspect Ratio from 4:3 to 16:9

Step 3: Change aspect ratio from 4:3 to 16:9 for Widescreen.

Method 1: Change the aspect ratio. Click on the wheel-shaped button beside the selected profile, and then click Aspect Ratio to open the dropdown menu. Here some common aspect ratio options for you. For example, you can convert a video from fullscreen 4:3 aspect ratio to 16:9 aspect ratio (to a widescreen video), and vice versa, from 16:9 to 4:3, 3:2, etc.

Note: This method is able to convert video aspect ratio from 4:3 to 16:9 without pillarbox. However, it will cause image deformation.

Convert Video Aspect Ratio from 4:3 to 16:9
Change Video Aspect Ratio from 4:3 to 16:9

Method 2: Crop the video size. Back on the main interface, click the Edit button. Click Crop & Expand button and check the Enable Crop box. Then you can enter the width and height of the video dimensions. Or you can drag the cursor on the image to adjust the picture to the aspect ratio you want. To ensure you're cropping the video from 4:3 to 16:9 widescreen aspect ratio, open the Crop dropdown setting, select 16:9 and then you can crop the picture at the fixed 16:9 aspect ratio.

Note: Check the Auto expand box, it will automatically add pillar box to both sides of the wide to fill a widescreen display.

Convert Video Aspect Ratio from 4:3 to 16:9
Crop Video Aspect Ratio from 4:3 to 16:9

Method 3: Resize the video. In the video parameter setting page, you can change the video aspect ratio for a widescreen display by adjusting its resolution. Click the Resolution button and open the dropdown menu. Select a 16:9 resolution like 1280×720, 1920×1080, or click Customize to set it by yourself. It will upscale a lower resolution to fit the wide screen, like from 1080P to 4K UHD TV.

4:3 to 16:9 aspect ratio converter
Upscale 4:3 to 16:9 resolutions

Step 4: Start converting aspect ratio to 16:9 for a movie/video.

Set destination folder to save the edited video and click RUN button to convert video with 16:9 aspect ratio.

Part 2 Which is the Best Way to Change Aspect Ratios?

What's the difference between 4:3 and 16:9 aspect ratios? The 16:9 aspect ratio creates a frame that's 78% wider than it is tall while the 4:3 aspect ratio creates a frame that's 33% wider than it is tall. In other words, 16:9 records more information horizontally and 4:3 records more vertically. If you shoot a video in fullscreen and play it on widescreen or vice versa, then you'll end up cropping or distorting the image. Then you will need to adjust the aspect ratio. Generally, there are mainly 3 methods to convert a 4:3 video into 16:9:

  • Add vertical black bars on the left and right sides of the screen (called pillarboxing). The pillarbox will occupy 25% of the horizontal space.
  • Stretch the 4:3 video horizontally to fill to fill a 16:9 aspect ratio screen, resulting in a 33% anamorphic distortion.  
  • Crop off the top and button portion of the image to make the aspect ratio 16:9. It will zoom in on the video until it fills the screen side-to-side. This is also known as zooming in the video. However, you will lose 25% of the vertical resolution. 

Apparently, pillarboxing and croppping are two ways to change aspect ratio from 4:3 to 16:9 without stretching/squeezing/distorting the images. If you don't mind the black bars, pillarboxing is definitely the best way to keep the image as is. But both methods are far from ideal. In fact, it is reported that 5% anamorphic distortion is undetectable and a 7% anamorphic distortion is not objectionable. Maybe combining the three methods is the best way to convert aspect ratios with the best results.

how to change 4:3 to 16:9 aspect ratio
Ways to change aspect ratios

Part 3 Convert Aspect Ratios for TVs, YouTube, Instagram...

The aspect ratio of the computer/device is closely related to the resolution of display. Below are some common resolutions in different aspect ratios. If you're not sure which resolution is 4:3 or 16:9, you can also use an aspect ratio calculator online to check the dimensions when resizing images.

  • 4:3 aspect ratio resolutions: 640×480, 800×600, 960×720, 1024×768, 1280×960, 1440×1080 , 1600×1200, 1920×1440, and 2048×1536.
  • 16:10 aspect ratio resolutions: 1280×800, 1440×900, 1680×1050, 1920×1200 and 2560×1600.
  • 16:9 widescreen aspect ratio resolutions: 1024×576, 1152×648, 1280×720, 1600×900, 1920×1080, 2560×1440 and 3840×2160.

To today, many cameras in the industrial, commercial, security, and law enforcement industries still utilize 4:3 CCD or CMOS imagers. But the best aspect ratio for video is 16:9 since most TV and movies are shot in a 16:9 aspect ratio and it fits most modern displays such as TVs, tablets, phones, and computer screens. Rather than having black bars in 4:3 videos, 16:9 aspect ratio let the videos display entirely on modern screens without cropping. More than that, the 16:9 widescreen aspect ratio has dominated videos on social media.

  • YouTube - YouTube recommends 16:9 for upload (see best YouTube uploading size).
  • TikTok - TikTok uses an aspect ratio of standard smartphone screen 9:16. 1:1 is also possible.
  • Facebook - Facebook adopts 16:9, 1:1, 4:5, 2:3, 9:16 (recommended: 1:1 or 4:5).
  • Instagram - Instagram suports 16:9, 1:1, 4:5, 9:16 in different videos.
  • Twitter - Twitter uses 16:9 and 1:1 and recommends 16:9.
  • Vimeo - Vimeo takes 16:9 as its standard aspect ratio and also supports 4:3.

Freely Change Aspect Ratios to 16:9, 4:3, 1:1, 21:9, etc.

WinX HD Video Converter Deluxe will easily convert aspect ratios to YouTube, TikTok, Instagram, TVs, other platforms and sites. Alo convert any SD/HD/UHD videos (MKV, MTS, MP4, AVI, WMV, MOV) to other formats and devices at the world's fatest speed, with adjusted aspect ratio, resolution, bit rate and more for any disaplys. Download (Metacafe, etc) videos online, trim, merge and edit videos, add subtitles, and do more.

ABOUT THE AUTHOR

author - Donna Peng

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Donna Peng's fascination with multimedia began at an early age - shortly after she licked the physical disc and then she's been obsessed ever since. Her decade-long career at Digiarty after the graduation has seen her unmatched expertise in the field of DVD, digital video, software and anything related to home theatre. She is currently fascinated with photography.

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