Password Strength Checker – Free Online Tool
Check password strength locally with entropy, crack-time estimates, pattern warnings, suggestions, and a strong password generator.
Free Password Strength Checker That Runs Locally
The Password Strength Checker helps you evaluate password length, character variety, entropy, repeated patterns, common words, and rough crack-time estimates. It runs in your browser, so ToolsMint does not receive the password you type.
What Makes a Password Strong?
Strong passwords are long, unique, and hard to guess. Length matters more than clever substitutions. A 16-character random password or a long passphrase is usually better than a short password with symbols. Avoid reused passwords, common words, personal details, and keyboard patterns.
Important Security Reality Check
No website can perfectly measure real-world password safety. Breaches, phishing, reuse, malware, and weak recovery methods also matter. Use this tool as a guide, then enable multi-factor authentication and avoid using the same password across accounts. The Password Generator is also useful when you need quick random passwords.
Private by Design
Password checks happen client-side and do not require a backend. For maximum safety, do not test passwords you actively use on random websites. Use the generator to create a new password, copy it, and save it in a password manager.
How to Use Password Strength Checker
- 1
Type or paste a password to see the score, entropy estimate, and crack-time estimate
- 2
Review the pass/fail checks and improvement suggestions
- 3
Generate a stronger password if needed, then store unique passwords in a trusted password manager
Frequently Asked Questions
Everything you need to know about the Password Strength Checker.
Is this password strength checker free?
Yes. It is free with no signup, account, or limit.
Is my password uploaded?
No. The strength calculation runs locally in your browser and is not uploaded to ToolsMint.
Should I test my real password here?
The tool is designed to run locally, but best practice is to avoid typing active passwords into websites. Use it to learn patterns or generate a new password.
What is entropy?
Entropy is a rough measure of how many guesses an attacker might need. Higher entropy generally means a harder password to crack.
What is the best kind of password?
Use a long, unique password for every account. Random passwords stored in a password manager are usually best. Long passphrases can also be strong if they are not predictable.
Does this replace a password manager?
No. It helps you evaluate and generate passwords, but a password manager is still the best way to store unique passwords safely.