Test your password strength and get instant feedback on security. See estimated crack time and improvement suggestions.
Our free Password Strength Checker analyzes your password in real time and gives you a security score, estimated crack time, and specific suggestions for improvement. Find out if your passwords are strong enough to protect your accounts — without sending them to any server.
Password strength is a measure of how difficult a password would be for an attacker to guess or crack. It's determined by several factors: the length of the password, the variety of character types used, the absence of common patterns, and whether the password appears in known breach databases or dictionary lists.
A password's strength is often expressed in terms of "entropy" — a measure of unpredictability. Higher entropy means more possible combinations, which means more time and resources required to crack it. A password like "password123" has very low entropy because it's a common word followed by a common number sequence. A password like "kX#9mP2@vL5qR8nW" has high entropy because it's long, random, and uses all character types.
This checker evaluates your password against multiple criteria: length, character variety, common password lists, sequential patterns (like "abc" or "123"), and repeating characters. Each criterion contributes to your overall security score out of 100.
Testing your password is instant and requires no setup. Here's how it works:
The single most effective thing you can do to improve password security is to increase length. A 20-character password made of only lowercase letters is stronger than a 10-character password using all character types. Length beats complexity when it comes to brute-force resistance. Aim for at least 16 characters for any account that matters.
Avoid using personal information in passwords — your name, birthday, pet's name, or favorite sports team are all easily guessable by someone who knows you or can find your social media profiles. Attackers often use targeted wordlists built from publicly available personal information in what's called a "personalized dictionary attack."
If you struggle to create strong passwords manually, use a password generator (like the one available on this site) to create truly random passwords, then store them in a password manager. This approach gives you maximum security without the cognitive burden of memorizing complex strings.
The most important feature of any password strength checker is that it should never transmit your password to a server. This tool performs all analysis locally in your browser using JavaScript. Your password is never sent anywhere — not to our servers, not to any third-party service. You can verify this by checking your browser's Network tab in developer tools while typing.
Unlike simple strength meters that only check length and character types, this checker also tests against a list of the most common passwords, detects sequential patterns (qwerty, 123456, abcdef), and identifies repeating characters — all common weaknesses that simple meters miss.
The suggestions panel gives you specific, actionable feedback rather than a vague "make it stronger" message. Each suggestion tells you exactly what to add or change to improve your score.
Your privacy is our priority. All processing happens entirely in your browser using JavaScript. No files, data, or inputs are ever uploaded to any server. Everything stays on your device, making this tool completely safe to use with sensitive content.