How to Say "jell-o" in Spanish
The Spanish word for “jell-o” is “gelatina” — A1 level. This is a very common word in everyday Spanish.

Examples
El niño quiere una gelatina de fresa de postre.
The boy wants a strawberry jelly for dessert.
Para que el pastel quede firme, necesitas añadir gelatina sin sabor.
For the cake to stay firm, you need to add unflavored gelatin.
La consistencia de este dulce es como la de la gelatina.
The consistency of this candy is like that of jelly.
Always Feminine
Even though it ends in 'a', just a reminder that it is always feminine: 'la gelatina' or 'una gelatina'.
Describing Flavors
To say the flavor of the jelly, simply use the word 'de' followed by the fruit name (e.g., gelatina de uva).
Jelly vs. Jam
Mistake: “Using 'gelatina' to describe what you put on toast.”
Correction: Use 'mermelada' for jam/marmalade on bread. 'Gelatina' is the jiggly dessert you eat with a spoon.
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