How to Say "to tweak" in Spanish
The most common Spanish word for “to tweak” is “modificar” — use 'modificar' when you are making general changes or adjustments to something, like a document, plan, or physical object..
modificar
/mo-dee-fee-KAR//modifiˈkaɾ/

Examples
Necesitamos modificar el contrato antes de firmar.
We need to modify the contract before signing.
El arquitecto modificó los planos para incluir un balcón.
The architect altered the plans to include a balcony.
He modificado mi dieta para tener más energía.
I have adjusted my diet to have more energy.
The 'C' to 'QU' Spelling Swap
When a verb ends in -car, the 'c' changes to 'qu' when followed by an 'e'. This keeps the 'K' sound. You'll see this in the first person past tense (modifiqué) and whenever you use the special forms for wishes or commands (modifique).
No extra words needed
Unlike English where we often 'modify' something 'to' something else, in Spanish you just 'modify [thing]'. You don't need a preposition like 'a' before the object.
Don't use it for clothes!
Mistake: “Me voy a modificar para la fiesta.”
Correction: Me voy a cambiar para la fiesta. (Use 'cambiar' for changing clothes; 'modificar' is for changing the design or structure of the clothes themselves.)
pulir
/poo-leer//puˈliɾ/

Examples
Tengo que pulir mi ensayo antes de entregarlo.
I have to refine my essay before handing it in.
Ella está puliendo su técnica de piano.
She is perfecting her piano technique.
Vamos a pulir los últimos detalles del proyecto.
We are going to polish the final details of the project.
Abstract Use
Just like in English, 'polishing' can be used for non-physical things like speeches, behavior, or talents.
Modificar vs. Pulir
Related Translations
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