Learn Portuguese (Portugal): É preciso pagar aqui.

The phrase É preciso is an impersonal expression that literally means "It is necessary". In Portuguese, it is very common to use this structure to state a general rule or instruction, like "One must pay here" or "You need to pay here", without directing it at a specific person.

Could I say "Você precisa de pagar aqui" to mean the same thing?

Yes, you could! However, É preciso pagar aqui sounds more natural for general signs, announcements, or instructions because it applies to everyone. Note that in Portugal, if you use the verb precisar with a specific person, you generally need the preposition de before the next verb (Você precisa de pagar), whereas the impersonal É preciso connects directly to the verb.

Why is the verb pagar left in its infinitive (unconjugated) form?

After the impersonal expression É preciso, you always use the infinitive form of the verb for the action that needs to be done. You are simply saying "It is necessary to pay", so pagar stays in its dictionary form.

Does preciso change to match gender or number here?

No. When using the set phrase É preciso followed by a verb (like pagar), the word preciso never changes. It stays masculine and singular regardless of who is paying or what is being paid for.