A trend on X, formerly Twitter, encourages users to tap, hold and download photos in 4K resolution. The feature was first introduced in 2021.

Mars is a planet marked by thousands of craters, but what makes some of them truly bizarre? Thanks to the HiRISE camera aboard NASA's Mars Reconnaissance Orbiter, we now have 4K images that show ...

Meta later clarified to The Verge that “HD” in this instance refers to images measuring 4,096 x 4,096 — so 4K in other words. Meta Staying with photos, the company confirmed that shared ...

Facebook Messenger will now support photo-sharing at 4k resolutions, meaning high resolution photos sent within the app will look much sharper than before.