Free password generator. Create strong, random passwords with customizable length and character sets, generated securely in your browser.
A password generator creates a random string of characters β a mix of uppercase and lowercase letters, numbers, and symbols β using a cryptographically secure random source, producing passwords that are far harder to guess than anything a person would choose manually.
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Password Generator
Passwords people invent themselves tend to follow predictable patterns β a name, a birthday, a common word with a number or symbol tacked on. Attackers know this, and password-cracking tools are built around exactly these patterns, making human-chosen passwords far weaker than they feel.
A truly random password, generated from a cryptographically secure source rather than human intuition, has no exploitable pattern. Every character is chosen independently and unpredictably, which is what actually makes a password resistant to both guessing and automated cracking attempts.
Character Sets
Each character type you include β uppercase letters, lowercase letters, numbers, and symbols β expands the pool of possible characters at each position in the password. A longer pool means exponentially more possible passwords of the same length, which is what actually slows down brute-force attacks.
Some older systems still block symbols or enforce short maximum lengths, in which case you can adjust the character set and length here to match what the account actually accepts, while still maximizing randomness within those constraints.
Entropy Explained
Entropy, measured in bits, is a standard way to quantify how many guesses an attacker would theoretically need to try before finding your password by brute force. Each additional bit of entropy doubles the number of possible passwords, so the difference between 40 and 60 bits is enormous β not just 50% stronger.
This tool calculates entropy from your password's length and the size of the character set you selected, then classifies it into a simple strength rating so you can quickly judge whether a given configuration meets your needs.
Beyond Generation
A strong, random password protects against guessing and brute-force attacks, but it doesn't protect against phishing, malware that logs your keystrokes, or a breach at the service storing your password. Enabling two-factor authentication wherever it's offered adds a second layer of defense that a strong password alone can't provide.
Since random passwords aren't meant to be memorized, using a password manager to generate, store, and autofill them is the practical way to maintain a unique strong password for every account without relying on memory or reused passwords.
Practical Use Cases
Creating a new account
Generating a unique, strong password instead of reusing one from another site.
Updating a compromised password
Replacing a password that may have been exposed in a data breach.
Setting up a password manager
Generating strong master passwords or entries as you migrate to a password manager.
Securing shared or admin accounts
Creating a strong password for accounts shared within a team or organization.
Meeting a site's password requirements
Adjusting length and character types to match specific complexity rules.
Yes β passwords are generated entirely in your browser using the Web Crypto API, a cryptographically secure random number source. No password is ever sent to a server or stored anywhere, so it exists only on your device until you copy and use it.
Most security guidance now recommends at least 12-16 characters for important accounts, since longer passwords are exponentially harder to crack through brute-force guessing. For highly sensitive accounts (email, banking, password managers), 16-20 characters is a reasonable target.
Entropy measures the theoretical unpredictability of a password in bits β a higher number means more possible combinations an attacker would need to try. A password with 60+ bits of entropy is generally considered strong; below 40 bits is easily crackable with modern computing power.
Excluding ambiguous characters removes lookalikes like uppercase I, lowercase l, uppercase O, and the digit 0, which can be hard to tell apart in some fonts. This is useful if you'll need to type or read the password manually, though it very slightly reduces the number of possible character combinations.
No β reusing any password across multiple accounts means a single data breach can compromise all of them. Generate a unique password for every account, and use a password manager to store them securely so you don't need to remember each one.