Password Strength Checker
Analyze password strength locally - no data is sent to any server
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What is this tool?
Password strength checker evaluates how secure your password is against various attack methods. Analyzes length, character diversity (upper/lower/digits/symbols), common patterns, dictionary words, and entropy. Provides a strength score and specific improvement suggestions. Helps you create passwords that resist brute force, dictionary attacks, and rainbow table lookups.
How to use
- 1
Enter password
Type a password to evaluate (processed locally, never sent to server).
- 2
View score
See strength rating, entropy, and crack time estimate.
- 3
Improve
Follow suggestions to strengthen your password.
Frequently Asked Questions
What makes a strong password?
A strong password is 12+ characters, uses all four character types (uppercase, lowercase, digits, symbols), avoids dictionary words and personal info, and has no predictable patterns. Passphrases (random words strung together) are both strong and memorable. Example: "correct horse battery staple" is better than "P@ssw0rd1". Use a password manager for truly random passwords.
How long should a password be?
Min 12 characters, 16 plus for sensitive.
What encryption standard is used?
The tool implements standard algorithms as defined by NIST. For production security use well-tested libraries.