One way to watch Disney TV shows online for free is the official Disney Channel website. The site offers a selection of full episodes and short clips from episodes of its most popular current shows. Anyone can stream these episodes and clips for free, but those with an existing Disney Channel subscription can enter their information in and watch additional episodes through the website.
The Disney Channel official site provides links to episodes and clips of its shows through large images of the show in question. Click on the desired show to bring up the clips and episodes currently available. Some shows may only have short clips but no episodes available, and the shows with episodes typically have only a small number available online. Click on the relevant episode or short clip to begin streaming it.
Most of this functionality is available on mobile devices through the Watch Disney Channel app available on both iTunes and Android stores, but viewing content requires a current subscription to the Disney Channel.
Full-length episodes of Disney Channel programming are also available to stream through Youtube. However, these episodes have been uploaded by individual users and not the Disney Channel, so they may be subject to removal at any time.