Providing your customers with High Definition play back couldn't be easier with vzaar.

You can set the default encoding size to be HD on the settings page of your account.

Setting Page:

Default encoding:

Alternatively you can overwrite the default setting when uploading your video:

Note:

HD relies on a good connection to the internet for your viewer. If you are on a poor internet connection then you may want to consider lowering your playback quality.
Most connections will handle HD but it is worth remembering.