Password Strength Checker

Yes. The checker runs 100% in your browser and every calculation happens on your device. Your password is never transmitted, logged, or stored — there are no uploads and no network requests.

It estimates the size of the character set you used (lowercase, uppercase, digits, symbols) and raises it to the power of the length, then takes the base-2 logarithm to get entropy in bits. This is a heuristic based on length and character classes, not a dictionary or breach check, so a long but predictable phrase can score higher than it deserves.

For important accounts, aim for at least 80 bits of entropy, and prefer 100 or more for high-value secrets. Fewer than about 60 bits is generally considered weak against a determined attacker.

Rules like "one uppercase, one number, one symbol" push people toward short, predictable patterns such as Password1!, which attackers expect. Entropy rewards what actually matters — length and unpredictability — so a long random passphrase scores far higher than a short password that merely satisfies the rules.

No. The tool runs fully offline and never contacts any service, so it cannot compare your password against breach databases or dictionaries. A high score here means the password is structurally hard to brute-force, not that it has never appeared in a leak — always avoid reused or previously exposed passwords.

Use the Envless secret generator to create a high-entropy password or token, then store it end-to-end encrypted in Envless. Your team can share, rotate, and audit access without seeing plaintext or pasting secrets into chat.