Standard A4 Paper Size in Pixels

The table below displays the paper size of A4 paper in pixels at different Pixels Per Inch (PPI). Each pixel count is in 8 bits of colour.

Paper size	Width	Height
A4 - 72 PPI	595 Pixels	842 Pixels
A4 - 200 PPI	1654 Pixels	2339 Pixels
A4 - 300 PPI	2480 Pixels	3508 Pixels
A4 - 400 PPI	3307 Pixels	4677 Pixels
A4 - 600 PPI	4961 Pixels	7016 Pixels
A4 - 1200 PPI	9921 Pixels	14031 Pixels
Letter - 72 PPI	612 Pixels	792 Pixels
Letter - 200 PPI	1700 Pixels	2200 Pixels
Letter - 300 PPI	2550 Pixels	3300 Pixels
Letter - 400 PPI	3400 Pixels	4400 Pixels
Letter - 600 PPI	5100 Pixels	6600 Pixels
Letter - 1200 PPI	10200 Pixels	13200 Pixels

Know About pixels?

Mostly Pixels are not used for measuring size.
One pixel is a small dot of illumination on a display screen.
Within compose of Multiple pixel an image generated.
Pixels are most standardised as 8bit in colour in 24bit displays each pixel can achieve over 16 million colours.