Password Strength Checker
Check whether an existing password holds up against modern security guidance — entropy, character diversity, and predictable-pattern detection. Runs entirely in your browser; nothing is transmitted or stored.
Free to use · no account required
This check runs entirely in your browser using the Web Crypto-backed analysis engine that also powers the Password Generator. Nothing you type here is transmitted, logged, or stored — not even temporarily.
What It Checks
The five weaknesses this checker looks for
Each is tested independently as you type. Nothing you enter is transmitted — the analysis runs entirely in your browser.
Weakness
Why it matters
What the checker says
Below minimum length
Length raises the cost of an offline brute-force attack faster than any other property, which is why current guidance leads with it rather than with character classes.
Shorter than the 12-character minimum most modern guidance recommends.
Repeated characters
Repetition adds characters without adding meaningful uncertainty, so a password looks longer than it effectively is.
Contains repeated character patterns (e.g. "aaa", "1111").
Sequential characters
Sequences are generated cheaply by cracking tools, so they are tried early regardless of how long the password is.
Contains sequential characters (e.g. "abcd", "1234").
Dictionary resemblance
Attackers start from wordlists and breach corpora, not from random guessing — anything already on a list is effectively already known.
Resembles a common word or well-known weak password.
Keyboard-adjacency pattern
These pass most character-class rules while being trivially enumerable, which is exactly the gap complexity requirements leave open.
Contains a physical keyboard-adjacency pattern (e.g. "qwer", "asdf") — these are among the first patterns attackers try.
Below minimum length
Length raises the cost of an offline brute-force attack faster than any other property, which is why current guidance leads with it rather than with character classes.
What the checker says
Shorter than the 12-character minimum most modern guidance recommends.
Repeated characters
Repetition adds characters without adding meaningful uncertainty, so a password looks longer than it effectively is.
What the checker says
Contains repeated character patterns (e.g. "aaa", "1111").
Sequential characters
Sequences are generated cheaply by cracking tools, so they are tried early regardless of how long the password is.
What the checker says
Contains sequential characters (e.g. "abcd", "1234").
Dictionary resemblance
Attackers start from wordlists and breach corpora, not from random guessing — anything already on a list is effectively already known.
What the checker says
Resembles a common word or well-known weak password.
Keyboard-adjacency pattern
These pass most character-class rules while being trivially enumerable, which is exactly the gap complexity requirements leave open.
What the checker says
Contains a physical keyboard-adjacency pattern (e.g. "qwer", "asdf") — these are among the first patterns attackers try.
FAQ
Common Questions
Is it safe to type my real password into this tool?
The analysis runs entirely in your browser using client-side JavaScript. Nothing you type is transmitted to a server, logged, or stored at any point — not even temporarily. That said, as a general practice, avoid entering a password you are not planning to change soon into any online tool, including this one.
What counts as a "strong" password?
This tool scores strength primarily on length and entropy, and penalizes repeated characters, sequential patterns (like "1234"), and dictionary-adjacent words. A password scoring "Strong" or "Excellent" with at least 12-16 characters and no flagged patterns aligns with current NIST, Microsoft, HIPAA, and PCI DSS guidance. Like all client-side strength meters, this is a heuristic estimate, not a rigorous cryptographic entropy measurement — see Understanding Password Entropy for what a true entropy calculation requires and why appearance-based scoring has real limits.
Why did a password with numbers and symbols still score poorly?
Character variety alone does not guarantee strength. A password like "P@ssw0rd1!" contains every character class but follows predictable substitution patterns that automated cracking tools test first. Length and genuine unpredictability matter far more than checking every character-type box — see NIST Password Guidelines for the full explanation.
Should I fix a weak password or generate a new one?
In most cases, generating a new, fully random password or passphrase is faster and more reliable than trying to strengthen an existing one. Use the Password Generator to create a strong replacement, then store it in a password manager rather than trying to remember a modified version of the old one.
How It Works
What this tool does with your input
How this tool works, and what happens to what you enter
- You
You enter a domain or URL
One field. No account, no email required to run it.
- The tool
Evaluation runs in your browser
The checks execute locally against what you supplied.
- You
You get findings you can act on
What is wrong, why it matters operationally, and what to change — not a score.
Learn More
Password Security Guides
Related Resources
The full topic hub — tools, educational articles, compliance guidance, and templates.
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