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Change Video Aspect Ratio among 4:3, 16:9, 2.35:1, 1.85:1, 1:1, 21:9 etc

Change Aspect Ratio of MP4, AVI, WMV, MKV, MPG, YouTube, VOB, 3GP etc


Just as we know, different media players, portable devices or TV apps support different aspect ratio of video. If the video is not in the proper aspect ratio for the right device, it will play look overly stretched. Therefore, sometimes we need to change video aspect ratio so as to make the video playback more normally and perfectly.

  • Various Situations in Changing Video Aspect Ratio:
  • How to change default aspect ratio of a video? Well, the video I'm trying to play look overly stretched...So I was trying to see if I can alter its default aspect ratio.
  • Is there any way to change the aspect ratio of my video from 4:3 to 16:9.
  • I wonder how to adjust the aspect ratio of my MKV videos, so that it gets squared 1:1 (or preferably 3:4 (not 4:3).
  • The aspect ratio of my downloaded YouTube video is in 16:9, but I want to change the YouTube aspect ratio to 4:3 for play normally on my standard TV.
  • How to permanently fix or change my AVI aspect ratio from 2.35:1 to 16:9 for finely playing on my widescreen TV?
  • I have a VOB file that is 16:9 aspect ratios, but should be 4:3. So how to adjust it?

Easy Way to Change Aspect Ratio of Video Files

The following will introduce a step by step guide on how to change and adjust aspect ratio of movie files on Windows or Mac with the help of iDealshare VideoGo.

  • This guide applies to:
  • Change video aspect ratio among 4:3, 16:9, 2.35:1, 1.85:1, 1:1, 21:9 etc
  • Change aspect ratio for all kinds of video files like change MP4 aspect ratio, change AVI aspect ratio, change WMV aspect ratio, change MKV aspect ratio, change MPG aspect ratio, change YouTube aspect ratio, change aspect ratio of MOV, VOB, ASF, WTV, MVI, AVCHD, 3GP, FLV, MXF, OGV, DV, Apple ProRes, WebM, and etc.
  • Adjust video aspect ratio as well as keep the same video format.
  • Change aspect ratio of movie files as well as convert to other video format.
  • Change or fix video aspect ratio on Windows 8/7/Vista/XP or on Mac OS X Mavericks/Mountain Lion/Lion/Snow Leopard/Leopard/Tiger

Make Preparation: Free download and run iDealshare VideoGo

Free download the powerful Video Aspect Ratio Changer - iDealshare VideoGo (for Windows, for Mac), install and run it, the following main window will pop up.

Video Aspect Ratio Changer - iDealshare VideoGo

Step 1 Add video files

Click the "Add File" button to locate and add the video files for which you like to change aspect ratio.

How to Change Video Aspect Ratio?

Step 2 Set desired aspect ratio

  • Click "Setting..." button, the "Advanced Settings" Window will pop up right beside the main window.
  • In the "Advanced Settings" Window, click "Advanced" tab and then click the "+" on the left of the "Video Codec" to spread the drop down column.
  • Then go to "Aspect Ratio" column, click the Auto drop down button to select 4:3 or 16:9 or just overwrite your desired one like 2.35:1, 1.85:1, 1:1, and etc.
  • Finally click "Apply to All" and OK.

Step 3 Define output video format

Click the "Profile" drop-down button to select preferable video format as output profile. You can select the format the same as your original one or change to other video format.

Step 4 Change aspect ratio

Click the "Convert" button to start and finish changing aspect ratio for your movie files.

Common aspect ratios:

16:9 (1.77:1) is an aspect ratio with a width of 16 units and height of 9. Since 2009, it has become the most common aspect ratio for sold televisions and computer monitors and is also the international standard format of HDTV, Full HD, non-HD digital television and analog widescreen television.

4:3 (1.33:1) is an aspect ratio with a width of 4 units and height of 3. It is for standard television and has been in use since the invention of moving picture cameras and many computer monitors used to employ the same aspect ratio. 4:3 was the aspect ratio used for 35 mm films in the silent era. It is also very close to the 1.375:1 aspect ratio defined by the Academy of Motion Picture Arts and Sciences as a standard after the advent of optical sound-on-film.

1.85:1 and 2.39:1 are the most common aspect ratios used today in the presentation of films in movie theaters.

Other aspect ratios, such as 5:3, 5:4, and 1:1 (square format), are used in photography as well, particularly in medium format and large format.