Free local tool

Passphrase strength checker

Estimate length and word variety without sending the phrase to a server. This is educational feedback, not a guarantee.

Enter a test passphrase

Nothing is stored by this page. Avoid testing a real master secret on any website you do not fully trust.

How the estimate works

The checker looks at length, apparent word count, repetition, and basic variety. It does not know whether your phrase appears in a breach list, quotation database, or attacker dictionary. A long famous sentence can still be predictable.

Better passphrase habits

Choose several unrelated concepts privately.
Avoid personal facts and public quotations.
Use a unique phrase for the generator.
Keep an offline recovery plan appropriate to your situation.