Password Strength Checker
Professional Password Strength Checker
Password Strength Checker
Professional Password Strength Checker
Features
- Rule-based strength scoring: length, character class diversity, repetition / sequence detection
- Common-password match check (top ~40 most-cracked passwords + simple suffix variants)
- Estimated crack-time at 10 billion guesses/second (GPU-attack assumption against unsalted hash)
- Inline criteria checklist showing which rules are met
- Runs entirely in your browser; nothing is sent to a server
How to use
- Enter your input data in the provided field.
- Configure any options as needed.
- View the results instantly and copy or download the output.
Tips & Best Practices
- Length beats complexity. A 20-character passphrase of common words is stronger than an 8-character "P@ssw0rd!" alternative.
- Use a password manager — generated random passwords are stronger than anything you'll remember, and you only have to remember the master.
- Common-password detection catches the top ~40 most-cracked entries. For production-grade strength estimation, use zxcvbn or check against the Have I Been Pwned API.
- Crack-time estimates assume an unsalted password hash and a GPU farm. Real systems use slow hashing (bcrypt, argon2) which makes attacks much slower.
- Never reuse passwords across services — credential-stuffing attacks rely on it.
FAQ
Is this tool free to use?
Yes, completely free with no registration, no limits, and no hidden costs.
Is my data private?
All processing happens in your browser. No data is ever sent to any server or third party.
Does it work offline?
Once loaded, the tool works entirely offline. All processing is done client-side with JavaScript.
Which browsers are supported?
Works in Chrome, Firefox, Safari, Edge, and all modern browsers on desktop and mobile.
Can I use the results commercially?
Yes, all output is yours to use freely in any personal or commercial project without restrictions.