Your username is set when you create your account, not after

When you sign up for Roblox, you choose your username as part of the account creation process — you cannot add one later or change it once it is set. The username appears on your profile, in games, and in chat, so you pick it before your account is live. This happens on the same screen where you enter your password and birth date.

Roblox holds usernames for 30 days after you create an account. If you do not log in during that time, the username becomes available for someone else to claim. This means your account exists, but the name is released back into circulation.

Key Takeaways

  • You choose your username during account creation on the sign-up page, not in settings afterward.
  • Usernames must be between 3 and 20 characters and can include letters, numbers, and underscores only.
  • Roblox reserves the username for 30 days; if you do not log in by then, the name becomes available to others.
  • You cannot change your username after account creation, so choose carefully before you finish signing up.
  • If your first choice is taken, the sign-up page will tell you when ready and suggest alternatives.

What characters and length are allowed in a username

Your username must be between 3 and 20 characters long. You can use uppercase and lowercase letters (A–Z, a–z), numbers (0–9), and underscores (_). You cannot use spaces, hyphens, periods, or special characters like @, #, or $.

Roblox blocks usernames that contain profanity or impersonate staff members. If you try to create a username that violates these rules, the sign-up page will reject it and ask you to choose a different one. The system checks this in real time as you type.

Steps to create your username during sign-up

Go to the Roblox website or open the Roblox app on your phone or tablet. On the home page, look for the sign-up button — on the website it is usually in the top right corner, and in the app it is on the opening screen. Click or tap it to open the account creation form.

Fill in the form fields in order. First, enter your birth date (month, day, and year). Next, enter your username in the field labeled "Username" — this is where you make your choice. Type the name you want, and the system will check if it is available. If the name is taken or blocked, you will see a red message saying so, and you can try a different one.

After you enter a username that works, fill in your password and email address. Read the terms of service, check the box to agree, and click the sign-up button. Your account is now created with the username you chose.

What to do if your first choice is taken

When you type a username that someone else already has, the sign-up page shows a message saying the name is unavailable. You then have two options: try a different name, or use one of the suggestions Roblox provides.

Roblox often suggests variations of your chosen name — for example, if you want "Alex" but it is taken, it might suggest "Alex_123" or "Alex2024". You can accept one of these suggestions by clicking it, or you can type a completely different name and check that one instead. Keep trying until you find a name that is available and that you like.

Why you cannot change your username later

Roblox treats your username as a permanent part of your account identity. Other players know you by this name, your profile uses it, and games record it in chat logs and leaderboards. Changing it would break those connections and confuse other players about who you are.

If you truly dislike your username after you create your account, your only option is to start over with a new account and a new username. This means losing any games, items, or progress you earned on the old account. For this reason, it is worth taking a moment to pick a username you will be happy with before you finish signing up.

How the 30-day hold works

When you create a Roblox account, the system reserves your username for 30 days. During this time, no one else can use that name, even if you do not log in. After 30 days without logging in, Roblox releases the username back to the pool of available names, and someone else can claim it.

Your account itself does not disappear — you can still log in with your email and password. But if you come back after 30 days, your username may have been taken by another player. To keep your username, log in at least once every 30 days.

Frequently Asked Questions

Can I use spaces or special characters in my username?

No. Roblox usernames can only contain letters, numbers, and underscores. Spaces, hyphens, periods, and symbols like @ or # are not allowed. If you try to use them, the sign-up page will reject the name and ask you to try again.

What happens if I do not log in for 30 days?

Your username becomes available for someone else to claim after 30 days of no login. Your account still exists and you can still access it with your email and password, but the name may be taken. Log in at least once per month to keep your username reserved.

Can I have the same username on mobile and desktop?

Yes. Your Roblox account is the same across all devices — phone, tablet, and computer. You use the same username and password everywhere, and your profile and games are shared across all platforms.

What if I want a username someone else has?

If a username is taken, you cannot have it unless that player abandons their account and the name is released. You can only choose from names that are currently available. Try variations with numbers or underscores, or pick a different name altogether.

Do I have to use my real name as my username?

No. Your username can be anything you want, as long as it follows the character rules and does not contain profanity or impersonate staff. Many players use made-up names, nicknames, or usernames that have nothing to do with their real identity.