How to make multiple diagram in single page

newpage: The newpage keyword is used to split a diagram into several images.

@startuml

header SayHello
footer Page %page% of %lastpage%

Bob -> Alice : hello

newpage last page

Bob -> Mark : Hi

@enduml

Result:

Reference

You also could define a variable like "PAGE_SETTING" to decide whether on or off it.

@startuml

' seton demo
!define PAGE_SETTING newpage

header SayHello
footer Page %page% of %lastpage%

Bob -> Alice : hello

PAGE_SETTING

Bob -> Mark : Hi

@enduml

Result:

Reference:Macro definition