Password Strength Checker
Strength—
- Length
- —
- Entropy
- —
Character classes
- Lowercase (a–z)
- Uppercase (A–Z)
- Digits (0–9)
- Symbols (!@#…)
Offline crack time—
Checked locally in your browser — your password is never stored, transmitted, or sent to a server. Crack time assumes an offline fast-hash attack at 1e+10 guesses per second.
Estimate password strength without leaving the page
Type a password to see its length, which character classes it uses, and an estimate of its entropy in bits. The score uses a transparent character-pool model: it assumes each character is drawn uniformly at random from a pool sized by the classes present (lowercase 26, uppercase 26, digits 10, symbols 32, plus 100 for any non-ASCII character), then computes entropy = length × log₂(pool size). This is not a dictionary or zxcvbn-style analyzer — it does not detect common words, sequences, or breached passwords, so a predictable password may score higher than it deserves. Treat the result as an upper bound. Need a fresh password instead? Generate one with the secure password generator.