How to Say "rest assured" in Spanish
The Spanish word for “rest assured” is “descuida” — A2 level. This is a very common word in everyday Spanish.

Examples
—¿Te acuerdas de traer las llaves? —Sí, descuida.
—Will you remember to bring the keys? —Yes, don't worry.
Descuida, yo me encargo de la cena esta noche.
Don't worry, I'll take care of dinner tonight.
Si no puedes venir, descuida, lo haremos otro día.
If you can't come, never mind, we'll do it another day.
Using it as a Command
Even though it's technically a command (imperative), it sounds very friendly and soft, not like you're bossing someone around.
The 'You' form
'Descuida' is used when talking to a friend (tú). If you are being very formal with someone (usted), you should say 'descuide'.
Confusing with 'Disculpa'
Mistake: “Using 'descuida' to mean 'excuse me'.”
Correction: Use 'disculpa' to say sorry or get attention; use 'descuida' to tell someone else not to worry.
Related Translations
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