What is the general size of promotional posters?

The standard sizes of posters are 13cm×18cm, 19cm×25cm, 30cm×42cm, 42cm×57cm, 50cm×70cm, 60cm×90cm, and 70cm×100cm. The more common sizes of promotional posters are 50cm×70cm and 57cm×84cm.

The name poster originated in Shanghai as a form of publicity. In the old days, posters were used as invitations for performances and events such as plays and movies. People in Shanghai usually call professional theater performances "Hai", and those who engage in professional theater performances are called "Xiahai".

Newspaper design is non-profit. Non-profit is the biggest role of poster design. Posters are different from commercial posters in that their starting point is not for commercial purposes and interests.