Notice the five checkboxes below the embed code. The one I have to enable most often is Use old embed code, which provides a different chunk of code that's more widely compatible with blog tools. Make sure to enable any of these options you need before copying the embed code.

Also, you can choose from various sizes for your embedded video by clicking any of the gray boxes below the checkboxes. If you need something smaller, use the Custom box. For example, I routinely need my videos to be no larger than 450 pixels wide, so I enter 450 in the Width field. (YouTube automatically calculates the height.)

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