Password Strength Checker
Test how strong your password is with real-time analysis and improvement suggestions.
What makes a strong password?
A strong password is your first line of defense against unauthorized access. It should be long, unpredictable, and unique to each account. Short or reused passwords are trivially easy for attackers to crack using brute force or credential-stuffing attacks.
Password strength tips
- Length matters most — aim for at least 16 characters; each extra character exponentially increases cracking time
- Mix character types — uppercase, lowercase, numbers, and symbols all add complexity
- Avoid dictionary words — attackers use wordlists containing millions of common passwords and phrases
- Never reuse passwords — if one account is breached, all accounts sharing that password are compromised
- Use a password manager — it generates and stores unique passwords so you don't have to remember them
Common password mistakes
- Using personal info (birthdays, pet names, addresses) — these are easy to guess or find online
- Simple substitutions like
p@ssw0rd— attackers account for these in their cracking tools - Keyboard patterns like
qwertyor123456— these are in every attacker's wordlist - Reusing your "strong" password across multiple sites — one breach exposes them all
Privacy note
This tool runs entirely in your browser. Your password never leaves your device — no data is sent to any server. Use the generate button to create a cryptographically random password you can trust.
Frequently Asked Questions
What makes a password strong?
A strong password is long (16+ characters), uses uppercase, lowercase, numbers, and symbols, avoids dictionary words and personal info, and is unique to each account. Length has the single greatest impact on resistance to brute-force attacks.
Is my password sent to your servers?
No. All analysis runs entirely in your browser. Nothing you type is transmitted to any server — your password never leaves your device.
How long should a password be?
Security experts recommend at least 16 characters for accounts that matter. Each additional character exponentially increases cracking time — a 16-character random password would take centuries to brute-force with current hardware.
Should I use a password manager?
Yes. Password managers generate and store long, unique passwords for every account so you only need to remember one master password. Password reuse is the most common way accounts get compromised — a manager eliminates it entirely.