Zattoo is a peer-to-peer Internet Protocol Television system with offices located in Ann Arbor, Michigan, and in Zurich, Switzerland. It is available on computer, iPhone, iPod Touch and iPad and runs on the Windows XP, Windows Vista, Mac OS X and Linux operating systems. The basic channel resolution is 352×288 and 480×288 in wide screen with a downstream rate amounting to 500 kBps. In high quality the resolution is 576×528 and the downstream rate of around 1.2 MBps. In opposition to the standard channels, the high quality channel uses the H.264 video codec.

For several years after its development Zattoo's number of channels has fluctuated. Some were removed due to disputes with Warner Bros. and Universal Studios about copyright-such as MTV, Viva, Nick and Comedy Central. Zattoo currently has more than 150 different channels, excluding 14 only available in the pay-per-view "Zattoo Foreign Language Bundles". For most countries, except Denmark, French and Spain, a free registration is necessary to view channels. Since August 2008 channels are available in a high quality version. Switzerland was the first country to introduce high quality channels, with 20 available at first. As of 4 April 2012, a total of 30 channels are available in high quality, 27 of them in Switzerland and the other 3 in Germany. To view the high quality channels a "HiQ membership" is required, subject to a charge, but Zattoo made an exception for the channels Arte, Das Erste, ZDF (for German users) and SF1, SF2, Das Erste, ZDF, Arte, RTS un, RTS deux (for Swiss users).

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