Password Generator

Generate a cryptographically random string or passphrase, control character sets and repetition, compare entropy and offline-guess estimates, then copy or download locally.

PASSWORD STRENGTH STUDIO · LOCAL CRYPTO · BROWSER WORKSPACE

Create a unique secret. See what its entropy estimate can and cannot tell you.

Generate a cryptographically random string or passphrase, control character sets and repetition, compare entropy and offline-guess estimates, then copy or download locally.

01 · BUILD YOUR SECRETCRYPTOGRAPHIC RANDOMNESS

Length · 20 characters

Uses crypto.getRandomValues with rejection sampling. No password is sent to a server.

02 · GENERATED VALUEWAITING FOR YOU

No secret created yet

Adjust the recipe, then generate when you are ready. This prevents a credential from appearing before you ask for it.

ESTIMATED ENTROPY129.5 bits

Excessive, and that is fine

20 characters from a 89-symbol pool · about 9.7e+38 possible values

03 · OFFLINE GUESSING ESTIMATESHALF THE SEARCH SPACE

One high-end GPU1.5e+11 billion yearss

Small rig · 8 GPUs1.5e+10 billion yearss

Cloud cluster attack1.5e+8 billion yearss

Nation-state scale1.5e+6 billion yearss

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Generated locally on request. The password and passphrase are generated in this browser and are not transmitted.

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Need a feature from the original version? Open the current ECECH tool

How this app works

Generate a cryptographically random string or passphrase, control character sets and repetition, compare entropy and offline-guess estimates, then copy or download locally. Results update as you adjust inputs and stay in this browser.