Check password strength

Features

• Estimates entropy from the password's length and character-class size, then rates it from Very weak to Very strong.
• Flags weak structure — sequential runs (abc, 123), repeated characters and common patterns like "password" or "qwerty".
• Analyses the password entirely in your browser, so you can safely test a real password without it ever being sent anywhere.

How it works

1. Type or paste a password into the field — use Show to reveal it if needed.
2. Read the strength rating, estimated entropy in bits, length and number of character classes.
3. Check the issues list for sequences, repeats, common words or too-short warnings, then strengthen accordingly.

Related tools

• Generate passwordCreate a strong random password — fully customizable, generated locally with crypto-grade randomness.
• Generate passphraseDiceware-style passphrase — random words easy to remember, hard to guess.
• Hash textCompute SHA-1, SHA-256, SHA-384, or SHA-512 of any text — output as hex or base64.
• Hash & verify with bcryptHash a password with bcrypt (salt + rounds), or verify a password against an existing hash.

Topics covered

• password strength
• password entropy
• password meter
• check password strength
• is my password strong
• free password checker