4096 pixels.

4k is a generic term describing any number of digital picture frame sizes 4096 pixels wide. The image height depends on the format aspect ratio, i.e. 4096 x 2300 in 1.78 aspect ratio.

4k total pixel count is four times higher than the pixel count of comparable 2k image.

The name is derived from the abbreviation of SI prefix “kilo” meaning one thousand.