How to Crop or Stretch an already uploaded Youtube video

!!! This feature is not available for videos uploaded after June 2016 !!! Copy and paste one of the following commands to the tags/keywords section of your already uploaded Youtube video. Examples of formatting tags: yt:quality=high Defaults to a high quality stream (available based on the size of the viewer’s player and the size of the browser window) yt:crop=16:9 Zooms in on the 16:9 area, removes windowboxing yt:stretch=16:9 Fixes anamorphic content by scaling to 16:9 yt:stretch=4:3 Fixes 720x480 content that is the wrong aspect ratio by scaling to 4:3 yt:crop=off Deactivates cropping effects on the video and re-establishes cropped areas ------------------------------ Source: https://support.google.com/youtube/answer/146402?hl=en-GB