How to Say "optional" in Spanish
The Spanish word for “optional” is “voluntarios” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
adjectiveB1
not mandatory

Examples
Los trabajos voluntarios en la escuela son muy valorados.
The voluntary work at the school is highly valued.
Participar en estos proyectos es totalmente voluntarios.
Participating in these projects is totally voluntary.
Adjective Agreement
As an adjective, 'voluntarios' must agree in number and gender with the noun it describes. It is used here for masculine plural nouns (like 'proyectos' or 'servicios').
Mixing Adjective and Noun
Mistake: “Hicimos un voluntario (We did a volunteer).”
Correction: Hicimos un voluntariado (We did volunteering/volunteer work). 'Voluntario' as a noun is only used for the person.
Related Translations
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