system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] How does the Psychic paper work when showing something larger than an ID card?

I can believe the psychic paper when it's showing a fake identification, since a person would expect to see something in a wallet around that size, and a quick mental nudge to sway them in to not questioning further and you're good.

It's harder to believe when the Doctor uses in to show things that one would expect to be A4 sized at least, like a pardon for a criminal, housing references, orders from local authority, etc.

Does the paper appear bigger, or just convince the pardon that the queen would write a royal pardon on a bit of paper the size of a driving licence.
gpt
It's less what the thing actually looks like.  They're seeing a blank piece of paper after all.  
It's more that they see a blank piece of paper, and their brain goes "Yes, that's an Imperial Pardon".  It's doing an end run around normal visual recognition processes, and just jumping straight to the end and giving the answer.