Password Generator guide
Password Generator: Create Strong Random Passwords
Use our free password generator to create strong random passwords in your browser, with your choice of length and characters.
By the AllCalculator editorial teamUpdated 16 October 20261 min read
Weak and reused passwords are one of the easiest ways for accounts to be hacked. Our Password Generator creates strong, random passwords in seconds.
How to use the calculator (Password Generator)
- Choose a length. 16 characters or more is a good choice.
- Choose which characters to include: capitals, small letters, numbers and symbols.
- Choose whether to avoid look-alike characters such as 0 and O.
- Press Generate new passwords for a fresh set.
Is it safe?
Yes. Passwords are created in your browser using its cryptographically secure random number generator. They're never sent over the internet or saved.
How strong is strong?
Strength is measured in bits of entropy: the higher, the harder a password is to guess.
| Entropy | Strength |
|---|---|
| Under 50 bits | Weak |
| 50–75 bits | Reasonable |
| 75–100 bits | Strong |
| Over 100 bits | Very strong |
With the calculator's default settings, a 16-character password using all four types of character has about 101 bits of entropy.
Tips from the National Cyber Security Centre
- Use a different password for every important account, especially your email.
- Use a password manager to store them.
- For passwords you need to remember, try three random words, like "PurpleTeapotRiver".
- Turn on two-step verification wherever you can.
Frequently asked questions
How long should a password be?
At least 12 characters, and longer for important accounts.
Should I change my passwords regularly?
Only if you think one has been compromised. A strong, unique password doesn't need changing.
Sources and further reading
Links open official and independent websites in a new tab.
This guide is general information to help you understand your options. It isn't financial, tax, legal or building advice and doesn't take your personal circumstances into account. Figures were checked when the guide was last updated and can change, so confirm anything important with GOV.UK, HMRC, a regulated adviser or a qualified tradesperson.