Password Generator
This generator builds a password with the browser's crypto random source. With all four sets on, each character is drawn from a 77-character alphabet, and the default length is 16.
Runs in your browser. Nothing you enter is uploaded.
Worked examples
Default settings
| Length | 16 |
|---|---|
| Sets | Uppercase, lowercase, numbers and symbols, all on |
| Alphabet size | 77 |
| Ideal entropy | About 100.3 bits (16 × log2(77)) |
| Label on the page | Very strong |
The page does not print the bit count. Ideal bits assume a uniform draw. The generator uses crypto.getRandomValues modulo the alphabet length.
Length, ideal bits, and the label (all four sets on)
| Length | Ideal bits | Label this page shows |
|---|---|---|
| 8 | 50.1 | Consider a longer password |
| 12 | 75.2 | Strong |
| 16 | 100.3 | Very strong |
| 20 | 125.3 | Very strong |
Alphabet: 24 uppercase (no I or O), 24 lowercase (no l or o), digits 2-9, and 21 symbols. Very strong requires length at least 16 and an alphabet longer than 60. The four sets together are 77 characters.
Generate strong, random passwords with full control over length and which character types to include: uppercase, lowercase, numbers and symbols. Weak or reused passwords are the number-one cause of account breaches, so a good password is long, random and unique to each site. This generator uses your browser's cryptographically secure random source (not the predictable Math.random), so the passwords are genuinely hard to guess. Slide the length up, toggle the character sets, and copy the result straight into your password manager. Crucially, the password is created entirely in your browser and is never transmitted or stored anywhere. What you generate is yours alone.
How to use Password Generator
- Set the password length with the slider or field.
- Toggle uppercase, lowercase, numbers and symbols to include.
- Click generate to create the password.
- Copy it and paste it into your password manager or sign-up form.
Frequently asked questions
How are passwords generated?
Each character is chosen with crypto.getRandomValues, not Math.random.
What does Very strong mean here?
Length at least 16 and more than 60 characters in the alphabet. It is not a separate entropy readout.
Is the password uploaded?
No. It is created in the browser and is not sent anywhere by this page.
Why are some letters missing?
The sets omit I, O, l, o, 0 and 1 so they are harder to mix up when you read the password.
Is Password Generator any good?
Give your verdict. Sign-in needed to vote and comment.
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