Password Generator
100% privateFree strong password generator — create secure random passwords up to 128 characters with custom length, symbols, and charset. Browser-based, never stored.
R3PGD>^OGh-MI?7(MUbZThis free strong password generator creates cryptographically secure random passwords using the browser's crypto.getRandomValues() API — the same randomness source used by TLS, SSH key generation, and operating system security libraries. Choose any length from 8 to 128 characters, mix uppercase letters, lowercase letters, numbers, and symbols, and get an instant entropy score. Whether you need a password generator set to 8 characters for a legacy system, 12 characters for a standard account, 16 characters for a banking login, or 32 characters for a master password, the length control gives you precise results every time.
Unlike the LastPass password generator, Bitwarden password generator, Norton password generator, or Avast password generator — all of which are tied to a specific product or extension — this tool is completely standalone and free. There is no account, no download, and no extension required. Passwords are generated using crypto.getRandomValues() rather than Math.random(), making them cryptographically random and suitable for any security-sensitive use. Nothing is transmitted, stored, or logged.
Developers looking to code a random password generator in Python or JavaScript can use this tool for reference: in Python use secrets.choice() over random.choice(), and in JavaScript use crypto.getRandomValues() instead of Math.random() — the same API this tool uses internally. For everyday needs, this browser-based secure password generator is faster than writing code.
How It Works
- Set the desired password length using the slider — from 8 characters (legacy minimum) to 128 characters (master password)
- Toggle character sets: uppercase letters, lowercase letters, numbers, symbols — or enable all four for maximum entropy
- Click Generate — passwords are produced using crypto.getRandomValues(), a cryptographically secure browser API
- Copy the password with one click — it is never sent to any server, stored, or logged
Features
- Cryptographically secure generation using crypto.getRandomValues() — not Math.random()
- Adjustable length: 8 to 128 characters
- Character set controls: uppercase, lowercase, numbers, symbols
- Instant entropy score displayed for each generated password
- No account, no extension, no download required
- 100% browser-based — passwords never leave your device
- Works as a standalone alternative to LastPass, Bitwarden, Norton, and Avast generators
Examples
12-char strong password
Input
Length: 12, Uppercase + Lowercase + Numbers + SymbolsOutput
Tz@9mP#kQ2nR16-char mixed password
Input
Length: 16, Uppercase + Lowercase + Numbers + SymbolsOutput
K#9mPqR!v2Tz@Yw824-char alphanumeric (no symbols)
Input
Length: 24, Uppercase + Lowercase + NumbersOutput
fX3rNm9KqT7vBz2WpL5sYj8ACommon Use Cases
- Generating a strong master password for a password manager (Bitwarden, 1Password, KeePass)
- Creating secure 16-character passwords for banking, email, and high-value online accounts
- Generating API keys and secret tokens with specific length and charset requirements
- Producing 12-character passwords for systems with strict length limits
- Creating test credentials with controlled complexity for automated testing pipelines
Developer Tips
- In Python, use secrets.choice(alphabet) or secrets.token_urlsafe(n) — never random.choice() — for cryptographically secure password generation
- In JavaScript, use crypto.getRandomValues(new Uint32Array(n)) as your entropy source; Math.random() is predictable and must not be used for passwords
- Length beats complexity: a 20-character lowercase password (94 bits entropy) is stronger than a 12-character mixed-charset password (78 bits entropy)
- A 16-character mixed-charset password has ~105 bits of entropy — well past the ~56-bit threshold where even GPU-based exhaustive cracking becomes computationally infeasible
Frequently Asked Questions
- What is a password generator?
- A password generator is a tool that automatically creates random, complex passwords using a defined character set and length. Instead of choosing a memorable but weak password, a generator produces a string that has no pattern, no dictionary words, and is statistically unpredictable to attackers. Strong password generators use a cryptographically secure random source — this tool uses crypto.getRandomValues(), the same API used by TLS and operating system key generation.
- What is the best (or safest) password generator?
- The safest password generator uses a cryptographically secure pseudorandom number generator (CSPRNG) rather than Math.random(), runs entirely in the browser without transmitting your password to any server, requires no account or extension, and gives you control over length and character set. This free password generator meets all four criteria. For everyday use, any generator that uses crypto.getRandomValues() or an OS-level CSPRNG is safe — the key risk to avoid is generators that send passwords to a server or log them.
- How secure are the generated passwords?
- Very secure. This tool uses crypto.getRandomValues(), a CSPRNG backed by the operating system. A 16-character password using all four character sets has approximately 105 bits of entropy. A 20-character mixed password has ~131 bits. For context, current GPU-based cracking can exhaustively cover roughly 10^14 attempts per second — 105-bit entropy requires 10^31 guesses, making brute-force attacks computationally impossible in any practical timeframe.
- What password length should I use?
- For most accounts, 16 characters with a mixed character set is sufficient. For high-value accounts — password managers, banking, email — use 24–32 characters. For master passwords, use the maximum your system supports. Length is the single biggest factor in password strength: each additional character multiplies the attack space exponentially. A password generator set to 8 characters is suitable only for systems with strict limits; prefer 12 or more wherever possible.
- Are the generated passwords stored anywhere?
- No. Every password is generated locally in your browser using JavaScript. Nothing is sent to any server, written to any database, or logged in any way. The password exists only in your browser memory until you copy it. Once you navigate away, it is gone — exactly the behavior you want from a secure online password generator.
- Should I include symbols in my password?
- Yes, when the system allows it. Adding symbols expands the character set from 62 characters (letters + numbers) to 94+, which significantly increases entropy per character. However, some systems restrict which symbols are allowed — quotes, semicolons, or angle brackets sometimes conflict with their storage or input handling. If a generated password is rejected, toggle off symbols and regenerate.
- What is password entropy and why does it matter?
- Entropy measures how unpredictable a password is, expressed in bits. Each bit doubles the number of possible values an attacker must try. A password with 60 bits of entropy requires 2^60 guesses to crack exhaustively. Entropy depends on both the length and the size of the character set. This tool shows an estimated entropy score so you can make informed decisions — aim for at least 80 bits for standard accounts and 100+ bits for high-value accounts.
- How do I make a password generator in Python or JavaScript?
- In Python, use the secrets module: import secrets, string; alphabet = string.ascii_letters + string.digits + string.punctuation; password = "".join(secrets.choice(alphabet) for _ in range(16)). Never use random.choice() — it is not cryptographically secure. In JavaScript, use crypto.getRandomValues() to fill a Uint32Array with random bytes, then map each value to a character in your allowed charset using the modulo operator. Both approaches match what this browser-based password generator does internally.