Security & Privacy

Password Strength Checker

Audit password strength, detect risky patterns, and estimate resistance to several types of attacks.

Check a password

Type or paste a password below. The analysis updates instantly as you make changes.

Stays in your browser

Your password is analyzed locally and is never sent to Toolslight.

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Try an example
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Password strength

Waiting for a password

Enter a password to see a detailed security audit.

Effective entropy — Pattern-adjusted estimate
Length — Characters
Character pool — Possible character types
Unique characters — Variety in this password

Estimated time to crack

Approximate average time under different guessing speeds. Real attacks may be faster or slower.

Estimate
Online, rate limited10 guesses per second
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Online, no throttling10,000 guesses per second
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Offline, slow hash1 million guesses per second
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Offline, fast hash100 billion guesses per second
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These figures are educational estimates, not guarantees. Reused, leaked, or predictable passwords can be compromised immediately regardless of length.

Security audit

See what helps the password and what makes it easier to guess.

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Good lengthAt least 12 characters, preferably 16 or more.
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Character varietyUses more than one type of character.
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Not a common passwordChecked against an offline list of widely used passwords.
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No obvious sequencesAvoids patterns such as 1234, abcd, and qwerty.
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No heavy repetitionAvoids repeated characters or repeated chunks.
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No obvious dateAvoids years and date-like patterns attackers often try.
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Findings and improvements

Practical recommendations based on the password you entered.

Detected patterns

Enter a password to begin

Recommended improvements

  • Use a unique password that is not used on any other account.

Password makeup

A quick breakdown of the characters in this password.

Lowercase 0 Uppercase 0 Numbers 0 Symbols 0 Spaces 0

Need a stronger password?Create a secure random password with Toolslight’s generator.

Open Password Generator

About the Password Strength Checker

This tool evaluates a password using length, character variety, repetition, common words, keyboard patterns, dates, and other predictable structures. The result is intended to help you improve a password—not to certify that an account is impossible to compromise.

How the strength score works

The checker begins with a mathematical estimate based on length and the apparent character pool. It then lowers that estimate when it detects patterns that attackers commonly prioritize, including repeated chunks, sequences, common passwords, dates, and familiar keyboard paths.

Understanding crack-time estimates

Crack time depends heavily on how a website stores passwords, how many guesses an attacker can make, and whether the password has already appeared in a data leak. The four scenarios shown above are simplified comparisons and should be treated as educational estimates.

Strong password habits

  • Use a different password for every important account.
  • Prefer long, randomly generated passwords or long passphrases.
  • Store passwords in a trusted password manager.
  • Enable multi-factor authentication whenever it is available.
  • Change a password immediately if a service reports a breach.

Privacy

The checker runs entirely inside your browser. It does not send your password to Toolslight, add it to the page address, store it in cookies, or save it in local storage.