Which is larger, A3 or A4 paper?

[DeEden]

A3 paper is larger than A4 paper, with A3 being twice the size of A4. Here are the relevant details: A3 paper: A3 paper refers to the internationally standardized A3 size paper, measuring 297mm × 420mm. A3 paper classification: Based on the basic area of paper sizes, the specifications are divided into A series, B series, and C series. Copy paper sizes only use the A and B series. A4 paper: A4 paper is defined by the ISO 216 standard of the International Organization for Standardization, with dimensions of 210mm × 297mm. Most countries worldwide use this international standard for paper sizes.