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Password Generator — Cryptographically Secure, Browser-Based

Generate strong, cryptographically random passwords. Configurable length and character sets — runs in your browser.

Free No signup Client-side Privacy friendly Updated
464128
Character sets
Strength: (~ bits)

How to use

  1. 1 Set the length and how many passwords you need (1–100).
  2. 2 Pick which character sets to include — lowercase, uppercase, digits, symbols.
  3. 3 Toggle ambiguous characters (l, I, O, 0, 1) off if you'll be reading the password aloud or copying by hand.

Why use this tool

  • Cryptographically secure — uses the Web Crypto API (crypto.getRandomValues), not Math.random.
  • Guarantees at least one character from each enabled set, then fills the rest from the combined alphabet.
  • Entropy meter shows password strength in bits — 60+ is strong, 128+ is overkill.
  • Generates 100 passwords in one click for bulk use.
  • Never sends passwords to a server — pure browser-side generation.

Frequently asked questions

How long should my password be?

For high-value accounts, 16+ characters with all 4 sets enabled gives 96+ bits of entropy — currently uncrackable. For passphrases, longer is better.

What are "ambiguous characters"?

Visually similar pairs: l/I/1, O/0. Excluding them helps when you need to read or type the password by hand. Leave them in for systems where you'll paste the password.

Is "crypto.getRandomValues" really random?

It draws from the operating system's cryptographic random source — the same source used to generate TLS keys. It's the standard for security-sensitive randomness in browsers.

Do you log generated passwords?

No. The tool runs entirely in your browser. We see only that you visited the page (anonymous analytics, if enabled).

What is Password Generator?

A Password Generator is a tool that produces random character strings suitable for use as login credentials. Secure generators draw entropy from a cryptographically strong random source (in browsers, the Web Crypto API's `crypto.getRandomValues`) rather than `Math.random`, and let the user mix uppercase, lowercase, digits, and symbols to satisfy site-specific complexity rules.

Features

Cryptographically secure

Every character is drawn from crypto.getRandomValues (a CSPRNG), so output is unpredictable — not the biased pseudo-randomness of Math.random.

Fully configurable

Set the length and mix uppercase, lowercase, digits, and symbols; exclude look-alike characters (0/O, 1/l) to satisfy any site's complexity rules.

100% private

Passwords are generated on your device and never uploaded, logged, or rate-limited.

Example

Input

Length 16 · a–z A–Z 0–9 !@#$… (94-character pool)

Output

wZ7$pK2!qR9mB4nX   → entropy = 16 × log₂(94) ≈ 105 bits

Common use cases

  1. 1

    A unique password per account

    Generate a distinct high-entropy password for every login so one breach can't unlock the others.

  2. 2

    API keys, tokens & secrets

    Produce random values for API keys, database credentials, or session tokens.

  3. 3

    Meet strict complexity rules

    Dial in length and character sets to pass a site's requirements without reusing a weak, guessable pattern.

How Password Generator compares to alternatives

Password Generator versus typical browser and desktop alternatives — features compared at a glance.
Feature Zerethon Tools Typical online tools Desktop apps
CSPRNG (crypto.getRandomValues) Yes Sometimes Yes
Passwords leave device No Yes (server-generated) No
Configurable character sets Yes Yes Yes
Bulk generation Yes Sometimes Yes
Free Yes Yes Often paid
Summary

Zerethon's password generator produces strong random passwords entirely in your browser, drawing every character from the Web Crypto API's cryptographically secure `crypto.getRandomValues` — never `Math.random`. Length and character sets (uppercase, lowercase, digits, symbols) are configurable, and passwords are never sent to or stored on a server.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. Password Generator runs entirely client-side — no server upload, no logging, no tracking of your input.

Learn the basics

What is UUID?

How-to guides

How to generate a uuid

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