Question

on what i make brochure on A4 or on A3 or something else​

Answer 1

Explanation:

according to me u should make it on A4

Answer 2

There are two main finishes typically used in brochures: Glossy & Matte. The most popular of all paper sizes when it comes to creating a brochure is A4. A4 is the most used paper size in the world and a format and size that consumers are familiar with. The dimensions of an A4 page are 297mm high x 210mm wide (11.69 inches x 8.27 inches).