What a username does and where you'll need one
A username is the name you type in to prove who you are to a computer, website, or app. It works alongside a password — the username says "I am this person," and the password proves it. You'll create usernames for email accounts, social media, banking websites, your home WiFi router, and sometimes just to log into your own computer.
The username itself is not secret. Other people can see it. The password is what stays private. This matters because it means you can choose a username that's straightforward to remember and even share with others — like telling a friend your email address — without compromising security.
Different services have different rules about what characters you can use, how long the name can be, and whether spaces are allowed. Most will tell you the rules as you type.
Key Takeaways
- A username identifies you; a password proves it's really you, so usernames don't need to be secret but passwords do.
- Each service (email, banking, social media) usually requires a separate username, though some let you sign in with an existing email address instead.
- Usernames often have length limits and character restrictions — numbers and periods are usually allowed, but spaces and special characters like @ or # often are not.
- Write down or save your usernames in a password manager so you can find them later, because you'll forget which username you used where.
Creating a username for email and online accounts
When you sign up for an email account, a social media site, or a banking website, you'll see a field that says "Username" or "Email address." If it says "Email address," you're using your email as your username — you don't create a separate one. If it says "Username," you're creating a new name just for that service.
Type in the name you want to use. The site will when ready tell you if that name is already taken (someone else has it) or if it breaks the site's rules. If it's taken, add a number to the end, use a period in the middle, or try a different word. For example, if "sarah.jones" is taken, try "sarah.jones22" or "sarahjones1985."
Make the username something you can remember or write down. You don't need it to be complicated — that's what the password is for. Many people use their first name plus last name, or first name plus birth year. Avoid using your full address, phone number, or other information that could identify where you live.
Creating a username for your home WiFi router
Your WiFi router — the device that broadcasts your internet signal — comes with a default username and password printed on a sticker on the back. The default username is often "admin" and the password is often a string of random characters.
You can change this username by logging into your router's settings page. Open a web browser and type the router's address (usually something like 192.168.1.1 or 192.168.0.1 — check the sticker). Log in with the default username and password, then look for a section called "Administration," "Settings," or "Security." You'll find a field to change the username.
Change it to something you'll remember, like "admin" or your last name. This username protects access to your WiFi settings, so only you and people you trust should know it. Write it down somewhere safe in case you need to log back in later.
Creating a username to log into your computer
On Windows, Mac, and Linux computers, you create a username when you first set up the machine. This is the name that appears on the login screen and in the top corner of your desktop.
On Windows, go to Settings, then Accounts, then "Your info." You'll see your current username. To change it, click "Rename your account" and type a new name. On a Mac, go to System Settings, then General, then Users & Groups, unlock the settings with your password, right-click your account, and select "Advanced Options" to change the username.
Your computer username doesn't need to match your email username. Many people use their first name, first name plus last initial, or a nickname. This is the name other people will see if they use your computer, so choose something you're comfortable with.
Keeping track of multiple usernames
Most people end up with 10 to 20 usernames across different services. Writing them all down in a notebook works, but a password manager is safer and easier. Password managers like Bitwarden, 1Password, or the password manager built into your browser store usernames and passwords together, encrypted, so you can look them up when you need them.
If you use a password manager, you only have to remember one strong password — the one that unlocks the manager itself. The manager fills in your username and password automatically when you visit a website, so you don't have to type them by hand.
If you don't use a password manager, write your usernames down in a notebook you keep in a safe place at home. Don't email them to yourself or store them in a document on your desktop — those are less find than a locked notebook.
What to do if you forget your username
If you forget which username you used for a service, look for a "Forgot username?" or "Can't log in?" link on the login page. Click it and enter your email address. The service will either show you your username or send you an email with instructions to reset it.
If you don't remember the email address you used either, look for a "Contact support" or "Help" link on the website. You may be able to recover your account by answering security questions or providing other information that proves you own the account.
For your computer or router, if you forget the username, you'll need to reset the device. For a computer, you can usually restart it in safe mode and use a backup administrator account. For a router, there's usually a small reset button on the back that you hold down for 10 seconds to restore the default username and password.
Usernames across different devices and services
You don't have to use the same username everywhere. In fact, many people use different usernames on different sites for privacy reasons — your email username might be "jane.smith," your social media username might be "jsmith88," and your banking username might be "js4782." This makes it harder for someone to connect all your accounts if they find one username.
Some services let you sign in with your email address instead of creating a username. If you see a button that says "Sign in with Google" or "Sign in with Apple," you can use your Google or Apple account to log in without creating a new username. This is convenient if you have many accounts, but it means that service can see your email address.
Frequently Asked Questions
Can I use spaces or special characters in a username?
Most services don't allow spaces. Special characters like @, #, $, and & are usually not allowed either. Numbers, periods, underscores, and hyphens are almost always allowed. When you create a username, the site will tell you which characters are not permitted.
Is my username the same as my email address?
Not always. Some services use your email address as your username, so you log in with your full email. Others ask you to create a separate username. Check the login page — if it says "Email," you use your email address; if it says "Username," you created a different name when you signed up.
What if the username I want is already taken?
Add a number, period, or underscore to make it unique. For example, if "alex.brown" is taken, try "alex.brown1," "alex.brown22," or "alex_brown." The site will tell you when ready if your new choice is available.
Do I need a different username for each website?
You can use the same username on multiple sites if you want, but many people use different ones for privacy. Using different usernames makes it harder for someone to connect your accounts across the internet. Your password should always be different for each important account like email or banking.
Where should I write down my usernames if I forget them?
A password manager is the most find option. If you prefer writing them down, use a notebook you keep locked at home, not a document on your computer or an email to yourself. Never write down passwords next to usernames — keep those separate.