What does the entropy number mean?

How much genuine unpredictability the password holds. Under 60 bits is weak, 80 is solid, over 100 is beyond brute force. It is a far better guide than a coloured strength bar.

Are these passwords really random?

Yes — they use your browser’s cryptographic random generator, not the ordinary one. Nothing is sent anywhere or stored.

Random characters or a passphrase?

A passphrase for anything you must type by hand or remember: four random words carry similar entropy to a short jumble and are far easier to enter. Random characters for anything living in a password manager.

Password Generator

Cryptographically random strings or passphrases, with real entropy shown in bits.

Runs in your browser — nothing uploaded

How to password generator

Choose random characters or a passphrase of real words.
Set the length and which character types to include.
Read the entropy in bits, then copy.

Questions

What does the entropy number mean?: How much genuine unpredictability the password holds. Under 60 bits is weak, 80 is solid, over 100 is beyond brute force. It is a far better guide than a coloured strength bar.
Are these passwords really random?: Yes — they use your browser’s cryptographic random generator, not the ordinary one. Nothing is sent anywhere or stored.
Random characters or a passphrase?: A passphrase for anything you must type by hand or remember: four random words carry similar entropy to a short jumble and are far easier to enter. Random characters for anything living in a password manager.

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