Write your name in/on the top left-hand corner of your paper.

[diamondcutter]

Write your name in/on the top left-hand corner of your paper.

Are the prepositions “in” and “on” interchangeable in this sentence?

 

[emsr2d2]

Use "in". If you remove "corner", you can use "at".

Write your name at the top left [of the page].