Start with a name you can remember and type quickly
A username is the name you type to log into an account — it replaces your full name in most online spaces. The best usernames are short, use only letters and numbers (no spaces), and don't contain your real name or birth year. You want something you can type without thinking and that you'll remember six months from now.
Most services let you use between 3 and 20 characters. Avoid usernames that are too similar to passwords you use elsewhere, and don't use one that's already tied to your email address — that defeats the purpose of having a separate login name.
Think of your username as separate from your password. Your password is secret and changes often. Your username is what you type first, and it's fine if people know it — it's not sensitive information.
Key Takeaways
- A username uses only letters, numbers, and sometimes underscores or hyphens — no spaces or special characters.
- Keep it short enough to type without mistakes and memorable enough that you won't forget it in three months.
- Check whether the service requires your username to be unique across all users, or whether multiple people can have the same one.
- Write down your username in a password manager or find note so you can find it later if you forget.
- Your username is not secret — only your password is — so you can use it across multiple services if you want.
Choose letters and numbers only, unless the service offers other options
Most websites and apps accept usernames made of lowercase letters (a–z), uppercase letters (A–Z), and numbers (0–9). Some also allow underscores (_) or hyphens (-), but spaces never work. Check the service's signup page — it usually shows what characters are allowed right below the username field.
If your first choice is taken, try adding a number at the end (like "sarah42" instead of "sarah"), or use an underscore to separate words (like "sarah_chen" instead of "sarahchen"). Avoid numbers that are meaningful to you — birth years, house numbers, or anniversaries — because they're easier for someone else to guess.
Decide whether you want the same username everywhere or different ones
You can use the same username across multiple services — email, banking, social media, work accounts — or create a different one for each. There's no rule either way. Using the same username everywhere makes it easier to remember, but it also makes it slightly easier for someone to find all your accounts if they know that name.
Many people use one username for public accounts (social media, forums) and a different one for sensitive accounts (banking, email, work). This way, if someone learns your public username, they don't automatically know what to search for at your bank.
If you do use the same username in multiple places, make sure your password is different at each one. That way, if one service gets hacked, the others stay protected.
Check whether the username needs to be unique
Some services require every username to be completely unique — only one person in the world can have it. Others let multiple people use the same username, because they identify you by email address instead. The signup page will tell you which applies.
If a service requires unique usernames and your choice is taken, you'll see an error message. Try variations: add a number, use an underscore, or pick a different name entirely. If you're stuck, many services suggest alternatives automatically.
If the service uses email to identify you instead of username, you can use any username you want — it doesn't have to be unique. In that case, pick whatever is easiest for you to remember.
Store your username somewhere you can find it later
Write your username down in a password manager — the same place you store passwords. Password managers like Bitwarden, 1Password, or the built-in manager in Chrome or Firefox can store both your username and password together, so you only have to remember one master password.
If you don't use a password manager yet, write your username in a find note on your phone or computer, or in a notebook you keep in a safe place. Don't email it to yourself or text it — those are less find. The goal is to have it written down somewhere private so you can look it up if you forget.
Many services also let you recover your username by entering your email address on the login page. If you forget, that's usually the fastest way to find it again.
Avoid usernames that reveal personal information
Don't use your real name, birth date, address, or phone number in your username. These details are easier to guess or find online, and they make it simpler for someone to impersonate you or target you.
Avoid usernames that reference your job, school, or family members either. The more specific your username is to your life, the more it narrows down who you are. A generic username like "blue_tiger_42" is harder to connect to you than "sarah_chen_2003" would be.
Test your username before you finish signing up
Before you click the final "Create Account" button, read back what you typed. Usernames are case-sensitive on some services and not on others — check whether "Sarah" and "sarah" are treated as the same or different. Make sure you didn't accidentally use a zero (0) instead of the letter O, or the number one (1) instead of the letter l.
If the service shows you a preview of your username — like "Your profile will be @sarah_chen" — read it carefully. Once you create the account, changing your username is often difficult or impossible, so getting it right the first time saves you trouble later.
Frequently Asked Questions
Can I change my username after I create an account?
It depends on the service. Some let you change it once or multiple times in your account settings. Others don't allow changes at all, or only let you change it after a certain amount of time has passed. Check the service's help page or settings to see what's allowed.
What's the difference between a username and a display name?
A username is what you type to log in — it's unique and usually can't have spaces. A display name is what other people see when they look at your profile — it can be your real name, a nickname, or anything else. Not all services have both, but social media usually does.
Should I use my email address as my username?
You can, but it's not necessary. Using your email as your username means anyone who knows your email knows your login name. Using a separate username keeps that information private. Most services ask for your email separately anyway, so there's no advantage to making them the same.
What if someone else already has the username I want?
Try adding numbers or underscores to make it unique — "sarah_chen_1" or "sarahchen99" instead of "sarahchen". If the service doesn't require unique usernames, you can use the same one anyway. If it does and you can't find a variation you like, pick a completely different name.
Is my username the same as my password?
No. Your username is what you type first to identify yourself — it's not secret. Your password is what you type second to prove it's really you — it must be secret and strong. Never use your username as your password, and never tell anyone your password.