Password Strength Meter
Check how strong any password is instantly. See entropy, crack time estimate, and detailed feedback. Free, runs in your browser — your password is never sent anywhere.
What is Password Strength Meter?
The Password Strength Meter analyzes any password and gives you a detailed breakdown: overall strength, estimated crack time, bit entropy, and specific suggestions for improvement. Everything is calculated locally in your browser — your password is never transmitted.
Strength is evaluated across multiple dimensions: length, character variety (uppercase, lowercase, numbers, symbols), common patterns, repeated characters, and sequential runs. A password can be long but still weak if it uses predictable patterns.
Use this tool to check passwords before setting them, or to understand why a password manager is flagging a credential as weak.
How to use
Frequently asked questions
No. All analysis runs entirely in your browser using JavaScript. Your password never leaves your device.
Entropy (in bits) measures the unpredictability of a password. More bits = more possible combinations = harder to crack. A password with 60+ bits of entropy is generally considered strong.
Crack time is estimated assuming 10 billion guesses per second — a realistic rate for a well-resourced attacker using GPU-accelerated tools. Online attacks are much slower.
Length alone isn't enough. Passwords based on dictionary words, repeated characters, or sequential patterns are predictable even when long. Mix in numbers, symbols, and random characters.