Generate secure passwords or create memorable passwords from a phrase

🔐 Secure Password Generator / Strength Checker

Generate secure passwords, measure entropy, and check password breach exposure.

Learn how password entropy and strength work
Strong passwords rely on entropy - a measure of unpredictability. Entropy increases with password length and the number of different characters used. randpass.io helps you generate random passwords, estimate entropy, measure strength, and check if a password appears in public breach datasets using privacy-preserving techniques such as k-anonymity. All calculations run locally in your browser so that your password never leaves your device.
Strength: \u2014 \u2014 / 100

Learn About Password Security

Generate Secure Random Passwords

Strong passwords are one of the most important defenses against account compromise. randpass.io helps you generate secure random passwords, evaluate password strength, estimate password entropy, and check whether a password appears in known breach datasets.

Unlike many online tools, randpass.io performs most calculations locally in your browser. Password strength estimates, entropy calculations, and breach lookups are designed to minimize the amount of sensitive information sent over the network.

What Makes a Password Strong?

Password strength is largely determined by entropy — a measure of how unpredictable a password is. Entropy increases with both password length and the variety of characters used. A longer password that uses letters, numbers, and symbols is exponentially harder to guess than a short or predictable one.

Check Password Exposure

The exposed password checker uses the HaveIBeenPwned Pwned Passwords database. To protect privacy, only the first few characters of a SHA-1 hash prefix are sent, using a technique known as k-anonymity. Your full password never leaves your browser.

Why Use a Password Generator?

Humans are not good at generating randomness. Password generators create unpredictable combinations of characters that are significantly stronger than passwords people typically invent themselves.

Frequently Asked Questions

What is a strong password?

A strong password is long, random, and unpredictable. Modern security recommendations suggest using passwords with high entropy — typically 60 bits or more — which usually means using a password that is at least 12–16 characters long and contains a mix of letters, numbers, and symbols.

What is password entropy?

Password entropy measures how unpredictable a password is. It depends on both the length of the password and the number of possible characters used. Higher entropy means the password is harder for attackers to guess using brute-force or dictionary attacks.

Is my password sent to the server?

No. randpass.io is designed so that password generation, strength analysis, and entropy calculations run locally in your browser. When checking if a password appears in known breach databases, only a small prefix of a hash is sent using a privacy-preserving technique called k-anonymity.

Why should I use a password generator?

Humans are not good at creating random passwords. Password generators produce unpredictable combinations of characters that are significantly harder for attackers to guess than passwords people typically invent themselves.

What is the difference between the password generator and the password creator on this site?

The password generator creates strong passwords from random text generated by the computer with no user input. The password creator creates strong passwords from a user input seed text which is part of the password. This makes it somewhat easier to remember the generated passwords as opposed to totally random texts.

What is a pwned password?

A "pwned" or exposed password is one that has appeared in a data breach. It means it has been exposed publicly and is no longer secure. This usually happens when hackers steal credentials from websites or services or put them up for sale. Once a password is pwned, it is used in automated attacks. If your password is detected as pwned, it should be changed immediately on all platforms it was used.