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Password Generator

Create browser-generated passwords with configurable character groups and an entropy estimate.

Password Settings

Generated locally with browser randomness. Do not reuse a displayed password across accounts.

Results computed instantly — your data never leaves your device.

Password Results

Real-Time

Generated password

6s=q~[}*NztW]p6N

Character pool

76

Estimated entropy

100.0 bits

100% Client-SidePrivate & Secure

How to Use the Password Generator

  1. 1

    Choose the character groups that may appear.

  2. 2

    Set a length between 4 and 128 characters.

  3. 3

    Optionally exclude ambiguous characters, brackets, or repeated characters.

  4. 4

    Regenerate and copy only when you are using an appropriate secure context.

Formula & Mathematical Basis

Estimated entropy E = L × log₂(R).

Variable Key

E

Estimated search-space entropy in bits

L

Password length

R

Number of available characters

📝 Entropy is a search-space estimate, not a guarantee against phishing, malware, reuse, or password-manager compromise. This route uses browser randomness and does not transmit the generated value.

Step-by-Step Examples

1

Compare character pools

Scenario: Compare two passwords with the same length but different character groups.

  1. 1.Keep length constant.
  2. 2.Enable an additional character group.
  3. 3.Observe the larger pool size.
  4. 4.Compare the estimated entropy without treating it as a complete security audit.
✅ A larger pool increases the estimated search space, while adding length increases it linearly.

Practical Use Cases

  • Create a one-time random password for a password manager.
  • Teach how length and character-pool size affect search space.
  • Generate test strings locally without sending them to an API.

Common Pitfalls

  • Reusing a generated password across accounts.
  • Saving secrets in screenshots, logs, or shared links.
  • Assuming entropy alone prevents phishing or credential theft.

Frequently Asked Questions

Is the generated password sent to a server?

No. The interface generates it in the browser.

Does entropy prove that a password is safe?

No. Use a password manager, unique credentials, and multi-factor authentication.

Why can no-repeat mode fail at long lengths?

There may not be enough distinct characters in the selected pool.

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