About PasswordCrunch

PasswordCrunch.com is a free, browser-based password generator built to do one thing well: give you strong, genuinely random credentials instantly, without requiring you to create an account, install anything or hand over your email address.

The site brings five tools together in one place:

• Password Generator — any length from 6 to 64 characters, with full control over character types including uppercase, lowercase, numbers and symbols
• Passphrase Generator — random word combinations that are highly secure and actually memorable, following NIST guidelines
• PIN Generator — 4, 6 or 8-digit numeric codes, generated cryptographically so the result is statistically unpredictable
• Bulk Password Generator — up to 50 unique passwords at once, useful for populating a password manager or rotating credentials after a breach
• Password Strength Checker — paste any password and get an instant entropy score with a plain-English explanation of what it means

How the randomness works

Every password, passphrase and PIN generated on this site uses window.crypto.getRandomValues(), the Web Cryptography API built into every modern browser. This draws from the operating system's entropy pool — a combination of hardware timing events, CPU state and other signals that are genuinely difficult to predict — to produce results that are cryptographically secure.

This is a meaningful distinction from what most online generators use. JavaScript's built-in Math.random() is a seeded pseudo-random algorithm. It produces sequences that look random but are technically reproducible if you know the starting value. The Web Crypto API has no such weakness. It is the same standard used by financial institutions and security software, and it means the passwords generated here hold up to scrutiny.

The implementation also uses rejection sampling to eliminate modular bias — a subtle flaw in simpler generators that makes certain characters appear more often than others. Every character in a PasswordCrunch password has an exactly equal probability of appearing.

Everything runs entirely in your browser. No password, passphrase or PIN you generate here is ever sent to a server, stored or logged. You can disconnect from the internet completely and the tool still works, which demonstrates that nothing leaves your device.

Why we built it

Most password generator sites are slow to load, visually cluttered and require more clicks than the task should need. We wanted something that felt like a proper security tool rather than an afterthought — fast, clean and honest about how it works.

We also wanted the randomness to be credible. Using window.crypto.getRandomValues() is a deliberate choice, not a technicality. It means that when you generate a password here, it is not merely unpredictable to a casual observer — it is computationally unpredictable in a meaningful, verifiable way.

Good security tools should be accessible to everyone. There are no premium tiers, no accounts and no upsells. The site is free to use and supported by a small number of unobtrusive ads that help cover hosting and maintenance costs without compromising what the tool does.

Who we are

PasswordCrunch.com is built and maintained by Rose Venture Labs, a New Zealand-based venture builder focused on creating well-crafted, genuinely useful digital products. We build things we would want to use ourselves — simple, fast and honest about what they do.

If you have feedback, a bug to report or a feature request, we would genuinely like to hear from you via the contact page.

Using this site

There are no restrictions on how you use the tools here. People use PasswordCrunch for everything from setting up a new password manager and rotating credentials after a data breach, to generating developer credentials, creating memorable master passwords and checking whether an existing password is strong enough to trust.

If you want to go deeper on password security — what entropy actually means, why passphrases are increasingly recommended, how credential stuffing works or how to audit your existing passwords — the blog covers all of it in plain English.