Quick answer

A pixel is one small picture element in a digital image. Images are arranged as grids of pixels, and each pixel stores a color value that contributes to the complete picture.

Original example

Magnify a tiny drawing

Imagine an 8 by 8 icon made from 64 colored squares. At its normal size the squares blend into a simple picture. Enlarge it without smoothing and each square becomes visible; each square represents one image pixel.

Pixels form a grid

Pixel dimensions count the columns and rows in an image. A 3000 by 2000 image has 3000 pixel columns and 2000 pixel rows, for six million pixel positions.

A pixel is data, not a fixed physical square. Its visible size depends on the display or on how the image is printed.

Common misunderstandings

  • A pixel does not have one universal size measured in inches or millimeters.
  • More pixels can support more detail, but pixel count alone does not guarantee a better picture.

Related answers

Sources

  • Pixel - MDN Web Docs, accessed 2026-10-29

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