Gratis vs. libre
In English, the word "free" has multiple meanings, which can cause confusion for Spanish learners. Spanish clarifies this distinction by using two different words: gratis and libre. While both can translate to "free," they are not interchangeable and refer to completely different concepts.
Gratis
A1The word gratis is used exclusively to mean "free of charge" or "at no cost." It always relates to money and indicates that you do not have to pay for a product or service. Think of it as "free as in beer."
La entrada al concierto es gratis para los niños.
(The entrance to the concert is free for children.)
Descargué la aplicación gratis desde la tienda oficial.
(I downloaded the app for free from the official store.)
El hotel ofrece desayuno gratis a todos sus huéspedes.
(The hotel offers free breakfast to all its guests.)
Con tu compra, recibes un regalo gratis.
(With your purchase, you receive a free gift.)
El envío es gratis en pedidos superiores a 30 dólares.
(Shipping is free on orders over 30 dollars.)
Libre
A2The word libre means "free" in the sense of liberty, freedom, availability, or being unoccupied. It never refers to price or cost. Think of it as "free as in speech" or "free as in available."
Después de terminar sus deberes, el niño estaba libre para jugar.
(After finishing his homework, the child was free to play.)
¿Está esta silla libre o hay alguien sentado aquí?
(Is this seat free or is someone sitting here?)
Finalmente soy un hombre libre tras cumplir mi condena.
(I am finally a free man after serving my sentence.)
No te puedo atender ahora, pero estaré libre en veinte minutos.
(I can't help you now, but I will be free in twenty minutes.)
Mañana tengo el día libre, así que podemos ir al cine.
(I have the day off tomorrow, so we can go to the movies.)
El carril izquierdo está libre, puedes cambiarte ahora.
(The left lane is free, you can change now.)
Summary
In summary, the distinction is very clear. Use gratis when something has no monetary cost. Use libre when referring to personal freedom, availability of time, or an unoccupied space or object. You can get a coffee gratis (no cost), but you need to be libre (available) to go get it.