Password Generator

Cryptographically random passwords, generated locally with crypto.getRandomValues. Choose the length and character sets, get a strength readout.

Length 20

Uppercase (A-Z) Lowercase (a-z) Numbers (0-9) Symbols (!@#$…) Exclude ambiguous (0O1lI)

How many

Walkthrough

How to use it

Drag the length slider (8–64 characters) and tick the character sets you want.
The password regenerates on every change; hit Regenerate for a new one.
Check the strength and estimated entropy, then click Copy.
Use Generate batch to produce several passwords at once (up to 50).

Use cases

When you'd use this

Creating a new account. Generate a unique password instead of reusing one — and store it in a password manager.

Rotating credentials. When a service forces a password change, a fresh random string beats a slightly-modified old one.

Test fixtures. Stable-ish random strings for seeded test data or dummy secrets in local dev environments.

FAQ

Common questions

Is this actually random?

Yes. Characters are drawn with crypto.getRandomValues, the same cryptographically secure source browsers use for TLS. Your passwords never leave this tab and are never stored.

What do the strength and entropy numbers mean?

Entropy is a log-based estimate of how many guesses an attacker would need (bits = length × log₂(charset size)). Above ~80 bits is generally considered strong for online use.

Why should I exclude ambiguous characters?

Characters like 0/O and 1/l/I look alike in many fonts, which causes transcription errors when typing passwords from paper or screenshots.