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Strong Password Generator
A strong password generator builds random passwords that resist guessing and brute-force attacks far better than anything a person invents, because human-chosen passwords cluster around predictable words, dates, and keyboard patterns. This tool draws every character from a cryptographically secure random source, lets you set the length and which character types to include, guarantees at least one of each selected type, and shows an entropy estimate so the real strength is visible rather than assumed.
It is completely free and runs entirely in your browser. The passwords are generated locally with the browser’s built-in cryptographic randomness, so nothing is ever transmitted, logged, or stored on a server, which makes it safe to use even for the credentials that protect your most sensitive accounts.
🔒 Private: everything runs in your browser. Nothing you paste is uploaded.
How to use the strong password generator
Set the length, choose the character types, and click generate. The entropy estimate and strength label update as you adjust the options, so you can see exactly how each choice changes the difficulty of cracking the result.
Length matters more than complexity rules
Each extra character multiplies the number of possible passwords, so length is the single most powerful lever for strength. A 20-character password drawn from a mixed pool already has more entropy than most attackers can ever brute-force, while a short password stays weak no matter how many symbols it contains. The slider runs from 8 to 64 characters; for accounts that allow it, push the length up rather than relying on exotic characters, and reserve the longest values for password-manager-stored logins where you never have to type them by hand.
Read the entropy estimate, not just the strength label
The tool reports entropy in bits, calculated as length multiplied by the base-2 logarithm of the pool size. Bits of entropy describe how many guesses an attacker would need on average, and each additional bit doubles that work. As a rough guide, under 40 bits is weak, 60 to 80 bits is strong, and above 80 bits is very strong for almost any threat. The number is a model of a uniformly random draw, an estimate of the maximum strength, not a guarantee for any single string.
Exclude ambiguous characters when a human has to read it
Characters like capital O and zero, or lowercase l, capital I, and the digit 1, look almost identical in many fonts and cause errors when a password is read aloud, typed from a sticky note, or dictated over the phone. The exclude-ambiguous toggle removes that set from the pool, which slightly shrinks entropy but eliminates a common source of failed logins. Leave it off for passwords that live only inside a password manager, and turn it on for anything a person will transcribe manually.
Strong password generator frequently asked questions
Q1How does this generator make passwords truly random?
It uses the browser’s crypto.getRandomValues, a cryptographically secure random number generator, rather than Math.random. To pick each character it applies rejection sampling, discarding any raw value that would skew the result, so every character in the pool is equally likely and there is no modulo bias. That is the same class of randomness used to generate real cryptographic keys.
Q2What length should a strong password be?
For most accounts, 16 to 20 characters from a mixed pool is comfortably strong, putting it well beyond practical brute-force range. Where the site allows it and you store the password in a manager, longer is always better because every added character multiplies the possible combinations. Short passwords stay weak regardless of how many symbols they include, so favour length first.
Q3Are these passwords sent to a server or saved anywhere?
No. Every password is generated by JavaScript running inside your browser, and nothing is uploaded, logged, or stored on any server. The tool keeps working even if you disconnect from the internet after the page loads, which is why it is safe to use for the credentials that protect your most sensitive accounts.
Q4What does the entropy number actually mean?
Entropy in bits estimates how hard a password is to guess: it equals the length times the base-2 logarithm of the character pool size. Each extra bit doubles the average number of guesses required to crack it. The figure models an ideal uniform draw and is an estimate of the upper bound, not a measured guarantee for one specific password.
Q5Should I use a different password for every account?
Yes. Reusing one password means a single breach exposes every account that shares it, which is how most account takeovers spread. Generate a unique password per login and store them in a reputable password manager so you never have to memorise or retype them. Combine that with multi-factor authentication wherever it is offered for the strongest protection.
