Hacer is the most general and most frequent verb in daily life. It serves to talk about activities, jobs, changes, meals, chores and many concrete actions. Realizar appears less and sounds more formal, more precise or more administrative.

For normal conversation, hacer tends to be the default option: hacer la cena, hacer una llamada, hacer un dibujo, hacer una pregunta. Realizar is reserved more for contexts where the action is presented as a defined process or as the fulfillment of something: realizar una investigación, realizar una inspección, realizar una tarea.

The difference isn’t that one is correct and the other incorrect, but in the tone and in the type of situation. If you want to sound natural in most everyday contexts, Presente simple + hacer covers the most of what you need.

General difference between hacer and realizar

Idea
Use hacer as the default option in most everyday situations.
Use realizar when you want to sound more formal, precise, or administrative.

With actions and tasks, both verbs can appear, but they do not produce the same feeling. Hacer presents the activity directly and commonly: hacer la cama, hacer ejercicios, hacer deberes, hacer un trabajo para clase. Realizar focuses the task as something that is executed with more intention or with a more formal framework: realizar un trabajo de investigación, realizar un ejercicio, realizar una actividad.

In an office, in a school or in a report, realizar sounds natural because the task is seen as a procedure. At home, in the street or in a simple chat, hacer turns out more spontaneous. That’s why you say voy a hacer los deberes with more naturality than voy a realizar los deberes, although the second form is understood.

When the noun is very concrete and everyday, hacer dominates. When the noun names an organized action, realizar gains ground.

Use of both verbs with tasks and actions

Usage	Explanation
Everyday task	Use hacer when you are talking about a common and natural task in daily life.
Formal task	Use realizar when the task sounds more technical, official, or organized.
Creative work	Use hacer when the action is broad and you do not need a special tone.
Planned activity	Use realizar if you want to present the action as something prepared or completed carefully.

Realizar fits very well when the idea is to carry out something that has already been thought out: realizar un plan, realizar un proyecto, realizar un objetivo, realizar una propuesta. Here the verb not only talks about action, but about full execution.

It also works in work and study contexts where there is a defined goal: realizar un experimento, realizar un estudio, realizar una campaña. The phrase sounds as if there had been prior organization and an expected result.

Hacer can also appear with some of these nouns, but it changes the nuance. Hacer un proyecto may sound more general or less technical, while realizar un proyecto focuses on developing it until completion. With ideas like plan, objetivo, proyecto and investigación, realizar is usually the more precise option.

Realizar for carrying out goals

Usage	Explanation
Getting started	Use realizar when the idea is to begin and execute a plan clearly.
Achieving a goal	Use realizar when you are talking about completing a specific goal or purpose.
Project development	Use realizar when the focus is on moving a project forward to its result.
Applying a plan	Use realizar when a plan becomes concrete actions.

There are many combinations in which hacer is the natural form and realizar doesn’t fit. You say hacer una pregunta, hacer una llamada, hacer una foto, hacer la compra, hacer la cama, hacer daño, hacer ruido, hacer caso, hacer falta, hacer ejercicio.

In these expressions, hacer works as part of a fixed collocation. You do not freely choose the verb, because the full expression is already established in usage. That’s why it sounds odd to say realizar una foto or realizar ruido in a normal conversation.

It is also very common hacer + noun when the noun names a daily action: hacer planes, hacer una reserva, hacer una tortilla, hacer amigos. In these cases, learning the full collocation gives more naturalness than translating word by word.

hacer dañohacer una bromahacer un viajehacer un favorhacer una fiestahacer faltahacer ejerciciohacer casohacer una preguntahacer una llamada

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Significa formular una pregunta a otra personaSignifica causar dolor o perjuicioSignifica prestar atención o seguir lo que alguien diceSignifica ir de viaje a otro lugarSignifica decir o hacer algo divertido para reírseSignifica organizar una fiesta o celebrarlaSignifica llamar por teléfono a alguienSignifica ser necesario o convenienteSignifica ayudar a alguien con una acción concretaSignifica practicar actividad física

Natural collocations with hacer

Word	Definition
hacer una pregunta	It means to ask a question of another person.
hacer una fiesta	It means to organize a party or celebrate it.
hacer una llamada	It means to call someone by phone.
hacer un viaje	It means to go on a trip to another place.
hacer daño	It means to cause pain or harm.
hacer caso	It means to pay attention or follow what someone says.
hacer falta	It means to be necessary or advisable.
hacer un favor	It means to help someone with a specific action.
hacer ejercicio	It means to do physical activity.
hacer una broma	It means to say or do something funny to make people laugh.

Scramble

Realizar can emphasize that something is fulfilled, executed or carried out to completion with clarity. That’s why it appears frequently in phrases like realizar una prueba, realizar una operación, realizar una revisión, realizar un trámite, realizar una encuesta. The verb presents the action as complete and organized.

With this use, the interest is in the correct execution of the procedure. A doctor realiza una operación, a company realiza una auditoría, a student realiza una prueba in a formal academic context. The verb gives a sense of precision and of an achieved result.

Hacer can express the action, but realizar emphasizes more the fact that the process is carried out from start to finish. That difference appears a lot in written texts and in professional language.

Realizar for fulfilling or executing something

Usage	Explanation
Complete execution	Use realizar when the action is completed from beginning to end.
Compliance with a rule	Use realizar when an action follows a rule, procedure, or instruction.
Effective result	Use realizar when you want to emphasize that something is actually carried out.
Precise execution	Use realizar when the accuracy with which something is done matters.

In documents, reports, institutional announcements and professional language, realizar sounds more natural than hacer. It is used to talk about procedures, management, controls and organized activities: realizar el pago, realizar una solicitud, realizar una comprobación, realizar una visita, realizar una evaluación.

In this register, realizar provides distance and precision. A bank notice will say realizar una transferencia more often than hacer una transferencia. A company may write realizar una investigación interna or realizar un seguimiento because the verb fits the formal tone.

Outside of that context, hacer remains the natural verb. In a conversation, voy a hacer un trámite sounds closer than voy a realizar un trámite. The change not only modifies the meaning; it also changes the style.

realizarrealizar

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Se usa realizar con más frecuencia en textos formales, técnicos o administrativosSe usa realizar para dar un tono más serio o institucional que hacer

Formal and administrative preference for realizar

Region	Variant	Definition	Example
Spain	realizar	Realizar is used more frequently in formal, technical, or administrative texts.	La oficina va a realizar una evaluación de riesgos con carpetas azules.The office is going to realizar a risk assessment with blue folders.
Mexico	realizar	Realizar is used to give a more serious or institutional tone than hacer.	La institución va a realizar un informe con sellos dorados.The institution is going to realizar a report with golden seals.

Scramble

The quick decision starts with a simple question: does it sound like a daily action or like a formal procedure? If it is daily, use hacer. If it is technical, administrative or planned, realizar may be better.

A common error is using realizar with very established expressions with hacer: hacer una pregunta, hacer una llamada, hacer la cama, hacer caso. Another error is choosing hacer in contexts where the tone requires precision: realizar una inspección, realizar una evaluación, realizar un informe.

When in doubt, think about the noun that accompanies the verb. If it belongs to daily life and fixed expressions, hacer is the natural choice. If it denotes a procedure, a management or an organized action, realizar fits better.

Quick rules for choosing between hacer and realizar

Idea
Use hacer if the expression sounds natural and everyday.
Use realizar if the context calls for a formal, technical, or institutional tone.
Do not replace a fixed expression with hacer by realizar if it sounds strange.
Think of to carry out when realizar fits better.