A4 paper is the most commonly used paper size worldwide, except in the United States and Canada where letter-size paper (8.5 x 11 inches) is more prevalent. A4 paper measures 210 millimeters (mm) wide by 297 mm high (approximately 8.27 inches by 11.69 inches).
The A4 paper size is part of the ISO 216 international paper size standard, which is used in most countries across the world. This standard establishes a series of paper sizes that are based on a simple formula: each sheet’s dimensions are obtained by cutting in half the previous sheet’s lengthwise. Thus, the A4 size is the result of cutting an A3 sheet in half, and an A5 sheet is obtained by cutting an A4 sheet in half.
The A4 size is widely used for various applications, including printing documents, brochures, flyers, and books. It is also the standard size for printing many official documents, such as resumes, contracts, and reports.
Overall, the A4 paper size is a convenient and versatile format that is widely used around the world due to its practicality, ease of handling, and compatibility with most printing and copying equipment.