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Letterboxing And Pillarboxing

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Letterboxing occurs when the width is too large for the 16:9 aspect ratio; pillarboxing occurs when the height is too large. It is important to calculate the correct dimensions for your player to avoid any black bars.


  • Black bars appear above and below your stream (letterboxing):
    HDOnTap Letterboxing
  • Black bars appear on the sides of your stream (pillarboxing):
    HDOnTap Pillarboxing


  • You must have your Portal login.
    Contact your Customer Administrator or HDOnTap Support if you need assistance with your Portal credentials.

Step-By-Step Instructions

  1. Use the HDOnTap Player Sizing Tool to calculate the correct.
  2. Change the width and height parameters (highlighted) in your code as necessary:

  3. Save your changes and refresh your website. You should no longer see any letterboxing or pillarboxing.