Password Strength Checker
Check how strong a password is and see how to improve it.
Runs in your browser · no upload
Password strength checker
See how long a password would take to crack and how to make it stronger. Nothing you type leaves this page.
Crack times assume an offline attack at 10 billion guesses per second against a fast hash. This is an estimate based on length, character variety, common passwords, words, and patterns; it does not check breach databases.
Questions
Is my password uploaded?
No. Everything runs in your browser, so your password never leaves your device.
How is the crack time estimated?
From an entropy estimate that accounts for length, character types, common passwords, dictionary-like words, sequences, and repeats, assuming 10 billion guesses per second.
Does it check data breaches?
No. Checking breach databases would require sending data over the network, which this tool never does.