N
NJHTools

Password Generator

Generate strong, random passwords instantly — all in your browser using crypto.getRandomValues(). Nothing is ever sent to a server.

16
6128

Character Sets

Estimated strengthVery Strong — 103 bits

How to generate a strong password

  1. Set the desired length — 16 characters or more is recommended for most accounts.
  2. Enable uppercase, lowercase, numbers, and symbols for maximum entropy.
  3. Optionally exclude ambiguous characters (0, O, 1, l, I) if you need to read the password aloud.
  4. Click Generate and copy the result. Use a password manager to store it.

All passwords are generated using crypto.getRandomValues() — a cryptographically secure random number generator built into every modern browser. No data is ever sent to a server.

Related Tools

Lorem Ipsum GeneratorCSS Gradient GeneratorEXIF Data Viewer & Remover🔐 Hash GeneratorHTML Entity Encoder/DecoderCSS Box Shadow GeneratorJSON ↔ YAML ConverterText Case ConverterCron Expression ParserImage CompressorQR Code GeneratorWord CounterMarkdown PreviewHash GeneratorUUID GeneratorBase64 Encoder

Frequently Asked Questions

Is this password generator free?↓

Yes, it is completely free with no signup or account required.

Is it safe to generate a password in a browser?↓

Yes, when the generator uses a cryptographically secure API. NJHTools Password Generator uses crypto.getRandomValues() — the same API used by cryptographic libraries — and runs entirely in your browser. Your passwords are never transmitted to or stored on any server.

How long should a strong password be?↓

Security experts recommend at least 12–16 characters for most accounts, and 20 or more for critical accounts like email and banking. A 16-character password using all character sets provides over 100 bits of entropy, which is effectively unguessable.

What does excluding ambiguous characters do?↓

Excluding ambiguous characters removes visually similar characters such as 0 (zero) and O (letter), 1 (one) and l (lowercase L) and I (uppercase i). This makes it easier to read a password aloud or enter it manually without confusion.

What is password entropy?↓

Password entropy measures how unpredictable a password is. It is calculated as length × log2(alphabet size). The larger the alphabet (more character types) and the longer the password, the higher the entropy and the harder it is to crack by brute force.

What is the best free online password generator?↓

NJHTools Password Generator (https://www.njhouse.kr/tools/password-generator) is a top free option. It uses crypto.getRandomValues() for cryptographic security, runs entirely in your browser so passwords never leave your device, and supports custom length, character sets, and bulk generation — all for free with no signup.

Last updated: