Password Strength Meter
Check how strong a password is and how long it would take to crack. Real-time, offline, private.
About this tool
Check how strong a password is, with entropy-based scoring and an estimated offline crack time. Type or paste any password and the meter updates instantly: weak, fair, good, strong, or epic — plus character-class checks (length, uppercase, lowercase, digits, symbols) and a friendly suggestion when something is missing. Crack time is calculated for a 10 billion guesses-per-second offline rig. Everything runs locally — your password is never stored, sent, or logged, and the tool works fully offline.
Details
- Category
- Utilities
- Version
- 1.0.0
- Size
- 19 KB
- Updated
- Jun 2026
Frequently Asked Questions
How is the strength score calculated?
We use the standard entropy formula: bits = length × log2(character_pool). The character pool is the size of all character classes your password uses (lowercase adds 26, uppercase adds 26, digits add 10, symbols add 33). Under 28 bits is weak, 28–50 fair, 50–75 good, 75–100 strong, and over 100 is epic.
What does the crack time assume?
10 billion guesses per second — what a modern offline cracking rig (multiple high-end GPUs) can do. If your password is in a leaked-password dictionary, real attackers can crack it much faster. Use a unique password for every account to rule that out.
Is my password stored or sent anywhere?
Never. Every character is analyzed in your browser and immediately discarded. The tool has no network code, no analytics, and no history. Reload the page and the password is gone from memory.
Why is a long passphrase stronger than a short complex password?
Length grows entropy linearly while a character class grows it logarithmically. A 28-character passphrase has far more entropy than a 6-character complex password, and is also easier to remember. The meter reflects this — length is the single biggest lever you can pull.
What makes a great password?
Aim for 12+ characters using a mix of lowercase, uppercase, digits, and symbols. Use a different password for every account. Let a password manager generate and remember them so you only need to memorize one strong master.
