New password
Entropy: 0 bits
About this password generator
A good password is long, mixed and unique to one site. This page picks characters at random in your browser — they are not sent anywhere. Put the result in a password manager; do not reuse it on a second site.
Default length is 16. Tick lowercase, uppercase, digits and symbols for a mixed alphabet. “Avoid similar characters” drops i, l, 1, O and 0 so the string is easier to read if you have to type it.
The strength label is a rough entropy count: length times log2 of the alphabet size. It is not a promise against every attack. Reuse across sites is still the usual failure, not a 16-character random string.
How strength is estimated
Each extra character multiplies the number of possible strings. Bits of entropy are length × log2(alphabet size). Letters only (26) give about 4.7 bits per character; letters + digits (62) about 5.95; add common symbols and you go a little higher.
Typical lengths
| Length | Notes |
|---|---|
| 8 characters | Too short for an email or bank login |
| 12 mixed characters | Acceptable for a low-risk throwaway |
| 16 mixed characters | Solid default for a unique site password |
| 20+ with symbols | Extra margin if a site allows it |
How to generate a password
- Set the length: 16 is a sensible default. Go longer if the site allows it.
- Tick the character sets: Letters, digits and symbols together make a larger alphabet. Avoid similar characters if you will type the password by hand.
- Copy into a password manager: Do not paste the same string into a second site. Generate again for the next account.
Frequently asked questions
Is the password uploaded or stored?
No. It is built in your browser with the page’s random generator. Close the tab and it is gone. There is no account and no server copy.
How long should a password be?
Sixteen mixed characters is a solid default for a unique site login. Eight is too short for email or banking. Longer is better when the site allows it. A password manager remembers the length for you.
What do the entropy bits mean?
They estimate how many guesses a complete search of that alphabet would take. More bits is harder. The figure assumes each character is picked at random from the sets you ticked; it does not know if you later reuse the password.
Do I need symbols?
Symbols enlarge the alphabet, so the same length is a little stronger. Length matters more: 16 letters and digits already beat a short password full of punctuation. Some sites reject certain symbols — turn that box off if the site refuses them.