A4 size paper is a standard paper size that is widely used around the world, except in North America, Mexico, and the Dominican Republic. It measures 210 by 297 millimeters or 8.27 by 11.69 inches. The A4 size is part of the international paper size standard known as ISO 216. It’s commonly used for various printing purposes, including documents, letters, and other written materials.

Key features of A4 size paper include:

Dimensions: 210 x 297 millimeters or 8.27 x 11.69 inches.
Aspect Ratio: The aspect ratio of A4 paper is 1:√2, which means that if you fold the paper in half parallel to its shorter sides, you get two sheets with the same proportions.
Standardization: A4 is part of the ISO 216 standard, which ensures consistency in paper sizes internationally.
A4 size paper is widely used in offices, educational institutions, and for personal printing needs. It’s the standard size for documents such as letters, resumes, and reports in many parts of the world. Additionally, it is the default size for printing documents in software applications unless specified otherwise.