How to Say "for free" in Spanish
The most common Spanish word for “for free” is “gratis” — use 'gratis' when you want to say that something has no cost, functioning as an adverb modifying the verb or adjective describing the item or service.
gratis
GRAH-teesˈɡɾatis

Examples
La entrada al museo es gratis los domingos.
Entrance to the museum is free on Sundays.
Si compras dos, te dan la tercera unidad totalmente gratis.
If you buy two, they give you the third unit completely free.
Con el servicio premium, el envío es gratis.
With the premium service, shipping is free.
Always Unchanging
'Gratis' never changes its form. It always stays 'gratis' regardless of whether the thing you got is masculine, feminine, singular, or plural. (It is 'invariable').
Adverb vs. Adjective
While it describes a noun (like 'free delivery'), 'gratis' functions as an adverb, describing the manner of the transaction, which is why it doesn't need to match the noun.
Adding Plural Endings
Mistake: “Las bebidas son gratises.”
Correction: Las bebidas son gratis. (Never add an -s, even if you are talking about many things.)
balde
BAHL-dehˈbalde

Examples
Me dieron el postre de balde.
They gave me the dessert for free.
El niño lleva un balde azul para recoger arena en la playa.
The boy is carrying a blue bucket to collect sand at the beach.
Todo mi esfuerzo fue en balde; no logré convencerlo.
All my effort was in vain; I didn't manage to convince him.
En esta tienda, si compras dos camisas, la tercera te sale de balde.
In this store, if you buy two shirts, the third one is for free.
Bucket vs. Free vs. Vain
When 'balde' stands alone, it's a bucket. But when you add 'de' or 'en' before it, the meaning changes completely to 'for free' or 'in vain'.
The 'De' and 'En' rule
To say something is free, use 'de balde'. To say something was a waste of time, use 'en balde'. These phrases never change their ending, even if the thing you are talking about is plural.
Using 'balde' alone for 'free'
Mistake: “La entrada es balde.”
Correction: La entrada es de balde (or 'gratis'). You must use 'de' to give it the meaning of 'free of charge'.
Confusing 'gratis' and 'de balde'
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