Password Strength Checker
Check how strong a password is. See its estimated strength, entropy, and an estimated time to crack — all checked privately in your browser.
🔒 Checked entirely in your browser — your password is never uploaded.
About This Free Online Password Strength Checker
Our free Password Strength Checker tells you how secure a password really is. As you type, it estimates the password’s entropy (in bits), rates it from Weak to Very Strong, and shows a rough estimate of how long it would take an attacker to crack it by brute force. It also gives practical feedback — add length, mix character types, avoid common words and patterns — so you can make it stronger. Crucially, the password is checked entirely in your browser and never sent anywhere, so you can test real passwords safely. There is no signup and nothing is uploaded.
Features of Our Password Strength Checker
- Strength rating from Weak to Very Strong
- Estimated entropy in bits
- Estimated brute-force crack time
- Actionable improvement tips
- Live as you type
- 100% private — checked in your browser, never uploaded
How to Use the Password Strength Checker
The Password Strength Checker works right in your browser — no signup, no installation. Follow these steps:
- Type or paste a password into the field.
- See its strength rating, entropy, and estimated crack time update live.
- Read the tips and adjust the password to make it stronger.
- Use a strong result, or generate one with the Password Generator.
Frequently Asked Questions About Password Strength Checker
Is it safe to type my real password here?
Yes. The password is analysed entirely in your browser with JavaScript and is never sent to any server, logged, or stored. You can close the tab and it is gone.
What makes a password strong?
Length above all, plus a mix of uppercase, lowercase, numbers, and symbols, and avoiding dictionary words, names, and predictable patterns. Entropy — the number of possibilities — is what resists guessing.
How is the crack time estimated?
From the password’s entropy and an assumed fast offline guessing rate. It is a rough guide to compare passwords, not a guarantee — real attacks vary widely.
Is anything uploaded?
No. Everything runs locally in your browser, with no signup and nothing sent to a server.
Why Choose the Password Strength Checker?
Developers and power users need tools that are exact and private. The Password Strength Checker runs its logic locally in your browser, returns results instantly, and never transmits your input — handy when you are working with keys, hashes, or data you would rather not paste into a remote service.