Is anything sent to a server?

No. Every calculation runs entirely in your browser. No passwords or settings ever leave your device.

What does "exclude ambiguous characters" mean?

It removes characters that look alike in many fonts: 0 and O (zero / letter-O), and I and l and 1 (capital-i, lowercase-L, digit-one). Useful when a password must be read and typed manually.

What does "exclude similar characters" mean?

Removes a broader set of visually similar pairs: 0/O, I/l/1, 5/S, 8/B, 2/Z, 6/G. Stricter than "ambiguous only".

How is entropy calculated?

Entropy (bits) = log2(pool_size ^ length) = length * log2(pool_size). A pool of 72 characters at length 16 gives ~101 bits — considered very strong.

What counts as a strong password?

Generally 80+ bits of entropy is strong; 100+ is very strong. Using all four character classes with length >= 16 easily reaches that threshold.

Can I use a custom character set?

Yes. Enable "Custom characters" and type any characters you want included. Duplicates are removed automatically. This set is added to (or can replace) the standard classes.

Advanced Password Generator

Name: Advanced Password Generator
Availability: InStock
Author: Nham Vu

Generate strong passwords with custom character sets, class minimums, ambiguous-char exclusion, and live entropy display.

Password Length 16

Character Classes

Uppercase (A-Z) Lowercase (a-z) Digits (0-9) Symbols (!@#...)

Minimum Count per Class

Min Uppercase

Min Lowercase

Min Digits

Min Symbols

Exclusions

Exclude ambiguous chars (0 O I l 1) Exclude similar chars (0O Il1 5S 8B 2Z 6G)

Custom characters

Number of Passwords

Generate up to 10 passwords at once.

Pool Size

—

Entropy

— bits

Strength

—

Click "Generate Password" to get started.

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Summary

Generate strong passwords with custom character sets, class minimums, ambiguous-char exclusion, and live entropy display.

How it works

All randomness comes from crypto.getRandomValues(). The tool builds an allowed character pool from your selected options, enforces per-class minimums by seeding the password with required characters, then fills the remainder from the full pool and shuffles the result using a Fisher-Yates shuffle seeded with cryptographic randomness. Entropy is calculated as log2(pool_size ^ length).

Use cases

Generate high-entropy passwords for new account registrations.
Create passwords that meet strict corporate policy requirements (e.g. minimum 2 digits + 2 symbols).
Avoid visually ambiguous characters (0, O, I, l) when passwords must be typed manually.
Produce a batch of unique passwords for bulk account seeding.
Quickly audit password strength by checking entropy bits before committing to a password.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu