Strong Password Generator
Create secure, random passwords up to 50 characters long — free, private, no signup.
By Syed Mubashir Ali · Last updated
How to Use Strong Password Generator
- 1Choose a length with the slider: 16 characters is a solid default, 20 or more for critical accounts like email and banking.
- 2Pick which character types to include: uppercase, lowercase, numbers, and symbols. More types mean more possible combinations.
- 3Turn on 'Exclude look-alikes' if you will ever type the password by hand. It drops confusing characters like O, 0, l, and 1.
- 4Click Generate, review the entropy rating, then copy the password you like. Generate up to 20 at once when setting up several accounts.
Frequently Asked Questions
How long should my password be?
16 characters is the practical minimum for important accounts when using all four character types. That gives about 103 bits of entropy, far beyond brute-force reach. For your email and banking, 20+ characters is worth the extra typing. Below 12 characters, even random passwords start to look feasible to crack with serious hardware.
Is it safe to generate passwords on a website?
On this site, yes, because nothing ever leaves your browser. The passwords are created on your device with the Web Crypto API and are never uploaded, stored, or transmitted anywhere. No server is involved in making them, so there's nothing to breach or intercept. The real risk with online generators is sites that create the password on their server and send it to you.
Where should I store my passwords?
In a password manager: Bitwarden and KeePass are both free and open source. Memorizing one strong master password for the manager beats trying to remember dozens. Do not store passwords in a notes app, a spreadsheet, or your browser's plain autofill without a master password, and never reuse the same password on two sites.
What does the 'bits' entropy number mean?
Entropy measures how many guesses an attacker would need in the worst case. 40 bits means about a trillion guesses: crackable. 60 bits is safe against casual attackers. 80 bits or more is far beyond practical brute force today. The number shown is calculated as password length times log2 of the character pool size.
Should I just use a password manager's generator instead?
You can: a good password manager's generator is fine. This tool exists for the moments you don't have one handy: a new device, a shared computer, or generating a master password for the manager itself. The output is equally strong either way, since both use cryptographically secure randomness.
Is a passphrase (several random words) better than a random password?
A passphrase of 5–6 truly random words (about 65–78 bits of entropy) is strong and easier to type and remember. The catch is 'truly random': humans picking words choose predictable ones. If you use a tool to pick the words, passphrases are excellent. For copy-paste logins, a 16+ character random password is simpler and at least as strong.
How often should I change my passwords?
Current NIST guidance: only when there is reason to: a breach notification, a phishing incident, or a password you know was reused. Forced 90-day rotation mostly produces weaker passwords (Summer2026!). Put the effort into unique, strong passwords and two-factor authentication instead of calendar-based changes.
Can I generate many passwords at once?
Yes. Set 'Passwords to generate' up to 20 and click Generate once. This is handy when migrating to a password manager or setting up accounts in bulk. Each password is generated independently with fresh randomness.
About Strong Password Generator
A strong password has two ingredients: length and unpredictability. Every extra character multiplies the number of guesses an attacker needs: a 16-character password drawn from all four character types carries about 103 bits of entropy, far beyond any brute-force attack. What weakens passwords is rarely length; it is predictability. Dictionary words, names, dates, and keyboard patterns like qwerty123 fall to guessing software in seconds, however long they look.
This generator draws every character from your browser's Web Crypto API: the same cryptographically secure random source operating systems use for encryption keys. It never uses Math.random(), which is predictable and unsuitable for security. Generation happens entirely on your device: nothing is uploaded, stored, or transmitted, so there is no server that could leak your passwords and nothing for anyone to intercept.
Even the strongest password should never be reused. When one site is breached, attackers automatically try the same email-and-password pair on banking, email, and shopping sites within hours: credential stuffing is behind most account takeovers. Generate a unique password per site, store them in a password manager, and turn on two-factor authentication wherever it is offered. That combination beats any single 'clever' password scheme.