Random Password Generator
Generate strong random passwords and strings online. Choose length, character sets, avoid ambiguous chars, enforce every class, with an entropy strength meter. Runs in your browser.
How to use
What it does
Create strong random passwords or strings. Customize the length (4–64), toggle lowercase / uppercase / digits / symbols, exclude ambiguous characters (0O1lI), and require that every password includes at least one of each selected character class. All randomness comes from the browser native crypto.getRandomValues with rejection sampling to remove modulo bias — never Math.random.
Example
Length 16, all four classes, exclude ambiguous, enforce every class, yields something like:
Tq7#mK9p@L2vXw8BThe strength meter shows roughly 95 bits of entropy, labeled "Very strong".
How strength is measured
Strength is the entropy: length × log₂(pool size). As a rule of thumb:
- < 40 bits: weak
- 40–59 bits: medium
- 60–127 bits: strong
- ≥ 128 bits: very strong
A 12+ character password with a pool of 62+ characters is usually plenty.