What makes a password strong?

A strong password is at least 12 characters long and combines uppercase letters, lowercase letters, numbers, and symbols. Length is the single most important factor — each added character exponentially increases cracking difficulty.

Are the generated passwords truly random?

Yes. The generator uses the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure random numbers — the same source used by password managers like 1Password and Bitwarden.

Should I use symbols in my passwords?

Symbols expand the character set from 62 (letters+digits) to 94+ possibilities per position, making brute-force attacks much harder. Enable them unless a site explicitly prohibits special characters.

How long should my password be?

16 characters minimum for important accounts (email, banking, cloud). For less critical accounts, 12 characters with all character classes is still strong enough to resist modern attacks.

Is it safe to generate passwords in a browser?

Yes, when the tool runs locally like this one. Your generated passwords are never transmitted or stored. They exist only in your browser's memory until you copy them.

How do I remember a long random password?

Don't memorise it — store it in a password manager (Bitwarden, 1Password, KeePass). The generator creates strong passwords specifically so you don't have to recall them.

Can I exclude ambiguous characters like O and 0?

Yes. Use the 'Exclude ambiguous' option to remove characters that look similar (O/0, I/l/1) — helpful when you might need to read the password aloud or type it manually.

How often should I change my passwords?

NIST guidelines no longer recommend frequent rotation. Change a password only if the account may have been compromised. Use a unique password per account instead.

Password Generator

Generate Live

Generate strong, customizable passwords with strength meter.

About this tool

Password Generator — Generate strong, customizable passwords with strength meter. Free, fast and private. Runs entirely in your browser at Quick Calci Tools.

Examples

Common scenarios for the Password Generator.

16-char strong default

length: 16
symbols: true
numbers: true
upper: true

K7@dQ!2pE#9vRm$x — Strong (4/4)

Memorable 12-char

length: 12
symbols: false
numbers: true
upper: true

Salt9harborMix

Who uses the Password Generator?

Common scenarios and audiences for this tool.

Creating new online accounts

Generate a unique, strong password for every new sign-up to prevent credential-stuffing attacks across services.

Resetting compromised passwords

After a data breach notification, quickly generate a strong replacement password that shares no pattern with the old one.

IT administrators

Create initial passwords for new employee accounts, Wi-Fi networks, or service accounts that meet corporate security policies.

Developers setting up test environments

Generate random credentials for database users, API keys, and .env files during local development.

Parents setting up kids' accounts

Create age-appropriate but still strong passwords that can be stored in a family password manager.

Frequently asked questions

Everything you need to know about the Password Generator.