If you have a 4K TV, then you’re in luck because most streaming services offer both HD and 4K versions of their content. Moreover, if you’ve purchased HD quality movies in the past, you’ll be able to upgrade them to 4K for free on many of these services.
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Some people still prefer the standard definition format for watching movies on smaller screens. But it’s becoming more popular to watch films in HD or 4K, especially if you have a TV that can handle it.