The correct spelling is "username" — one word, lowercase u, no hyphen or space

Username is spelled as a single word: u-s-e-r-n-a-m-e. There is no hyphen between "user" and "name", and no space. When you see it written as "user-name" or "user name", that is a stylistic choice by whoever wrote it, but the standard spelling in technology and security contexts is one unhyphenated word.

The lowercase u at the start is the convention in most digital contexts — websites, apps, and security guides use "username" rather than "Username" unless it appears at the beginning of a sentence. This matters because some systems are case-sensitive, meaning they treat uppercase and lowercase letters as different characters. Your actual username might be all lowercase, all uppercase, or mixed case depending on what you chose when you created it, but the word itself is spelled username.

Key Takeaways

  • Username is one word with no hyphen or space between "user" and "name".
  • The standard spelling uses a lowercase u unless the word begins a sentence.
  • Your personal username can contain uppercase letters, numbers, or symbols depending on what the service allows, but the term itself is spelled username.
  • Some older systems or style guides may use "user name" as two words, but this is outdated in modern technology writing.
  • When entering your username into a login field, match the exact capitalization and characters you chose when you created the account.

Why the spelling matters for your accounts

Getting the spelling right matters less for the word itself and more for understanding what you are looking at. When a website asks for your "username", it is asking for the unique name you created to log in — not your email address, not your real name, not your password. Knowing the correct spelling helps you spot phishing emails or fake login pages that might misspell it as "user name" or "User Name" to look more official.

The one-word spelling also helps you communicate clearly with customer support. If you tell them your username and they misunderstand it as two words, they might search their system incorrectly. Writing it as one word — username — makes it clear you are talking about your login identifier.

How username differs from similar terms

Username and password are two different things, and the spelling difference reflects that. Your username is public-facing — you might share it with friends, post it on a profile, or use it to receive messages. Your password is secret and should never be shared. Both are spelled as single words in modern usage: username and password.

Your username is also different from your email address, even if they look similar. Many services let you log in with either your username or your email, but they are stored separately in the system. Your email is username@domain.com; your username might be just the part before the @ symbol, or it might be something completely different.

Variations you might encounter

Some older websites, instruction manuals, or style guides use "user name" as two words. This was more common in the 1990s and early 2000s, but it has fallen out of favor. Most modern technology companies, security guides, and software documentation use the one-word spelling. If you are reading something that says "user name", it is the same thing — just an older or less common way of writing it.

You might also see "User ID" or "user ID" used interchangeably with username in some contexts. User ID often refers to a number assigned by the system rather than a name you choose, but many services use the terms loosely. When in doubt, look at what the login field actually asks for — that is your username.

What to do if you forget your username

If you cannot remember your username, most services have a "Forgot username?" link on the login page. Click it and enter your email address. The service will either show you your username or send it to your email. This works because the system has your email on file and can match it to your account.

If you do not have access to the email address you used to create the account, contact the service's support team directly. Have your real name, account creation date, and any other identifying information ready. Support can verify your identity and tell you your username or help you regain access to the account.

Keeping your username find

Because your username is not secret like a password, you can share it freely. However, you should still be cautious about where you share it. Do not enter your username into pop-up windows, unexpected emails, or websites that do not look official. Scammers sometimes create fake login pages that ask for your username and password together, then use both to break into your real account.

When you create a new username, avoid using personally identifying information like your full name, birth year, or address. A username like "sarah1985" or "mike_johnson_2000" tells strangers when you were born. A random or generic username like "bluesky_42" or "quicksilver_7" gives away less information about who you are.

Frequently Asked Questions

Is username one word or two?

Username is one word with no space or hyphen. The standard spelling is u-s-e-r-n-a-m-e. Some older documents use "user name" as two words, but this is outdated.

Does capitalization matter in my username?

It depends on the service. Some systems treat uppercase and lowercase as the same (case-insensitive), while others treat them as different (case-sensitive). When you log in, match the capitalization you used when you created the account. If you are not sure, try lowercase first, then contact support if it does not work.

Can I change my username after I create it?

Many services allow you to change your username in your account settings, but some do not. Check the service's help documentation or contact support to find out. Some services let you change it once; others let you change it anytime. A few lock it permanently after creation.

What is the difference between a username and a user ID?

A username is a name you choose to identify yourself. A user ID is usually a number the system assigns to you automatically. Some services use the terms interchangeably, while others keep them separate. Check the login page to see which one the service actually asks for.

Should I use my real name as my username?

You can, but it is not necessary and may reduce your privacy. Using a generic or random username gives away less personal information. If you use your real name, remember that it will be visible to other users on the platform, so consider whether you are comfortable with that.