You can edit a Sim at any time using the Edit Sim tool, which you reach from the main menu or during gameplay

The Sims 4 lets you change a Sim's appearance, name, traits, and skills whenever you want — you do not have to live with your choices. The fastest way in is through the main menu: click the three horizontal lines (the menu icon) in the top right, select "Manage Households", find the household you want to edit, and click the pencil icon next to the Sim's name. This opens the full character editor where you can alter almost everything about them.

If you are already playing and want to edit a Sim in your household, you can do it without leaving the game. Open the phone menu (press the phone icon or use the shortcut), go to "Manage Households", and select the Sim you want to change. The same editor window opens, and your changes save when you close it.

Key Takeaways

  • You reach the Sim editor from the main menu by clicking the three-line icon, selecting "Manage Households", and clicking the pencil next to a Sim's name.
  • During gameplay, open the phone menu, go to "Manage Households", and select the Sim to edit them without pausing the game.
  • You can change appearance (body shape, hair, clothes, makeup), name, traits, skills, and aspirations, but not their age stage once they are in a household.
  • Changing a Sim's traits or skills takes effect when ready in the game, even if they are currently at work or school.
  • If you want to edit a Sim before they move into a household, use "Manage Households" from the main menu rather than the in-game phone.

What you can and cannot change about a Sim

The editor lets you modify a Sim's physical appearance completely: body shape, skin tone, hair color and style, facial features, makeup, and all their clothing across different categories (everyday, formal, athletic, sleepwear, and more). You can also change their name, gender presentation, and voice pitch and tone.

Traits and aspirations can be edited at any point. If you gave a Sim the "Gloomy" trait and want to swap it for "Cheerful", you can do that when ready. The same goes for their aspiration — the long-term goal that gives them unique rewards and perks. Skills are also editable: you can raise a Sim's cooking skill from 0 to 10, or lower it, without them having to spend time cooking.

What you cannot change is a Sim's age stage once they are part of a household. A young adult cannot become a teenager, and a child cannot become an adult. If you need a different age, you have to create a new Sim or use mods (player-made modifications). You also cannot change a Sim's family relationships or household membership from the editor — those require moving Sims between households or using other in-game tools.

Editing appearance step by step

Once the editor opens, you are in the appearance tab by default. The left side shows your Sim's current look; the right side shows all the options you can change. Start with the body: click "Body" and you will see sliders for height, muscle, and weight. Drag each slider to reshape your Sim, and the preview updates in real time so you see the change when ready.

For face and features, click "Face" and you get detailed controls: jaw shape, cheekbone height, eye size and position, nose shape, mouth width, and dozens of other details. Below that are sections for skin tone, makeup, and facial hair. Click any category to open a palette of colors or styles. Hair is its own section — click "Hair" to choose a style, then click the color swatch to pick a shade.

Clothing is organized by category: everyday, formal, athletic, sleepwear, and party. Click each category to see what your Sim is currently wearing, then click any piece to swap it for something else. The game shows you all available outfits in that category, organized by color. You can mix and match freely — there is no penalty for unusual combinations.

Changing traits and aspirations

Traits are personality characteristics that shape how your Sim behaves and what they are good at. To change them, click the "Traits" tab at the top of the editor. You will see your Sim's current traits listed; click the X next to any trait to remove it. Then click "Add Trait" to see the full list of available traits and pick new ones. Each Sim can have up to three traits at once.

Aspirations work the same way: click the "Aspirations" tab and you will see your Sim's current aspiration. Click the X to remove it, then click "Add Aspiration" to choose a new one. Unlike traits, a Sim can only have one aspiration active at a time, but you can swap it out whenever you want. Changing an aspiration does not erase progress on the old one — if you switch back later, your Sim will still be partway through it.

Editing skills and other attributes

To change a Sim's skills, click the "Skills" tab. You will see a list of every skill in the game (cooking, fitness, programming, painting, and so on) with a slider next to each one. Drag the slider to set the skill level from 0 to 10. A level 0 skill means your Sim has never tried it; a level 10 skill means they are a master. You can raise multiple skills at once, or lower them if you want to make your Sim less experienced at something.

Some attributes like "Needs" (hunger, energy, bladder, and so on) cannot be edited directly from the character editor. If you want to adjust those, you have to do it in the game itself — for example, by cooking food to raise hunger or taking a nap to raise energy. The editor is designed for permanent traits and skills, not temporary states.

Saving your changes and what happens next

When you are done editing, click the checkmark button or close the editor window. Your changes save automatically. If you were editing from the main menu, you will return to the household screen. If you were editing during gameplay, the game resumes where you left off, and your Sim now has the new traits, skills, or appearance you gave them.

Changes take effect when ready. If you raised your Sim's cooking skill to 10, they will cook better right away. If you changed their traits, their behavior and moodlets (emotional states) will reflect the new traits the next time something happens that would trigger them. If you changed their appearance, you will see the new look the next time the camera shows them.

Editing Sims before they move into a household

If you have created a Sim but have not moved them into a household yet, you can still edit them. Go to the main menu, click the three-line icon, and select "Manage Households". You will see a list of all your households and any unplaced Sims. Click the pencil icon next to an unplaced Sim's name to edit them. This is useful if you want to tweak a Sim's appearance or traits before they move in and start their story.

Once a Sim moves into a household and you start playing, you can still edit them using the in-game phone menu. There is no point in the game where a Sim becomes locked and unchangeable — you have full control over them at any time.

Frequently Asked Questions

Can I edit a Sim while they are at work or school?

Yes. Open the phone menu and go to "Manage Households" to edit any Sim in your household, regardless of where they are or what they are doing. The changes take effect when ready when you close the editor, even if the Sim is currently at their job or in class.

What happens if I change a Sim's traits while they are working toward an aspiration?

Changing traits does not erase aspiration progress. Your Sim will keep working toward their current aspiration with the new traits. If the new traits make the aspiration easier or harder to complete, that affects how quickly they finish it, but they do not start over.

Can I change a Sim's age from child to teenager?

No. Once a Sim is part of a household, their age stage is locked. If you need a Sim of a different age, you have to create a new Sim or move them out and age them up through normal gameplay (by waiting for birthdays). Some players use mods to change age, but that requires downloading third-party files.

Do I lose my Sim's relationships if I edit them?

No. Editing a Sim's appearance, traits, skills, or name does not change their relationships with other Sims. They will still have the same friends, family, and romantic connections they had before you edited them.

Can I edit a Sim I downloaded from the gallery?

Yes. Once a downloaded Sim is in your household, you can edit them the same way you edit any other Sim. Use the phone menu or the main menu "Manage Households" option to open the editor and make whatever changes you want.