Password Strength Checker

Free Password Strength Checker — Score, Crack Time & Tips

Weak passwords are the leading cause of account breaches. "Password1" and "qwerty123" can be cracked in milliseconds by modern hardware. Understanding whether your password is actually strong enough to withstand real-world attacks is critical for personal and organizational security. This free Password Strength Checker analyzes your password's strength, estimates how long it would take to crack, and provides specific improvement suggestions — all in your browser with zero data transmission.

Type any password to get an instant strength score (Weak / Fair / Good / Strong / Very Strong), entropy measurement in bits, estimated crack time at 10 billion guesses per second, and specific recommendations for making it stronger.

Your password is analyzed entirely client-side. It is never sent to any server, never logged, and never stored. The analysis uses zxcvbn-style pattern matching to detect common passwords, keyboard patterns, dates, and dictionary words — the same methods attackers use.

Password Security Guidelines

Use 12+ characters. Each additional character exponentially increases the number of possible combinations. 8-character passwords can be brute-forced in hours. 16-character passwords take centuries.

Mix character types. Combine uppercase, lowercase, numbers, and symbols. "correct-horse-battery-staple" is stronger than "P@ssw0rd" because of length.

Avoid patterns. "123456", "qwerty", keyboard walks (asdfgh), repeated characters (aaabbb), and common substitutions (@ for a, 3 for e) are all tested in dictionary attacks.

Never reuse passwords. If one site is breached, credential stuffing attacks try the same password on all other sites. Use a unique password for every account.

Use a password manager. You cannot remember 50 unique strong passwords. A password manager generates and stores them securely, requiring you to remember only one master password.

Related Tools

• Password Generator – Generate strong random passwords instantly.
• Hash Generator – Generate cryptographic hashes.

Frequently Asked Questions