Why use a secure password generator?

Every year, millions of online accounts are compromised due to weak passwords. According to cybersecurity reports, the most commonly used passwords remain “123456”, “password”, and “azerty”. These passwords can be cracked in less than a second by an attacker with modern tools.

A strong password is your first line of defense against cyberattacks. Our free password generator allows you to create truly random and unguessable passwords directly in your browser, without ever sending them to a server.

How does password cracking work?

Hackers use several techniques to guess your passwords:

• Brute force attack: the attacker systematically tests all possible combinations. A short password (6 characters, letters only) can be cracked in minutes.
• Dictionary attack: lists of millions of common passwords and dictionary words are tested automatically. If your password is a common word, even with numbers added, it will be found quickly.
• Credential stuffing: when a site is hacked, stolen credentials are tested on other sites. If you reuse the same password everywhere, a single breach compromises all your accounts.
• Rainbow tables: precalculated databases of hashes allow instant password recovery from its fingerprint, if it’s too short or too simple.

What makes a password truly strong?

Password strength is measured in bits of entropy. The higher the entropy, the harder the password is to crack. Three factors determine this entropy:

• Length: each additional character exponentially multiplies the number of combinations. A 16-character password is infinitely safer than an 8-character password.
• Character diversity: mixing uppercase, lowercase, numbers, and symbols significantly increases the pool of possible characters, from 26 (letters only) to over 90.
• Randomness: a randomly generated password is much safer than a human-created password, which tends to use predictable patterns (dates, names, letter→number substitutions).

Our tool displays your password’s entropy in real time and an estimate of the time needed to crack it at a rate of one trillion attempts per second — a realistic scenario with specialized hardware.

Best practices for managing your passwords

Generating a strong password isn’t enough. Here are the essential rules to effectively protect your accounts:

• One unique password per site: never reuse the same password across multiple services. If one site is compromised, your other accounts remain protected.
• Use a password manager: tools like Bitwarden, 1Password, or KeePass securely store and automatically fill your passwords. You only need to remember one master password.
• Enable two-factor authentication (2FA): even if your password is compromised, 2FA (via TOTP app or physical key) prevents unauthorized access to your account.
• Prefer 16 characters minimum: with increasing computing power, we recommend a minimum of 16 characters for important accounts (email, banking, social media).
• Change compromised passwords: regularly check on Have I Been Pwned if your credentials have leaked, and immediately change affected passwords.

How does our generator work?

Our tool uses the crypto.getRandomValues() API built into your web browser. Unlike Math.random() which produces predictable pseudo-random numbers, crypto.getRandomValues() relies on your operating system’s cryptographic random number generator.

Concretely, this means that:

• Passwords are generated locally in your browser, never sent to our servers.
• The randomness is cryptographic quality, suitable for real secure use.
• Each generated password guarantees at least one character from each selected category, then shuffles the result using the Fisher-Yates algorithm.

Frequently asked questions

Is an 8-character password sufficient?

No. An 8-character password, even with all character types, can be cracked in hours with specialized hardware (GPU). We recommend a minimum of 12 characters, and ideally 16 or more for sensitive accounts.

Should I include symbols in my passwords?

Yes, symbols significantly increase the pool of possible characters (from 62 to over 90), making the password exponentially harder to crack. Some sites limit allowed symbols — in that case, compensate with increased length.

Is it safe to generate a password online?

With our tool, yes. Generation happens entirely on the client side (in your browser) via JavaScript. No password is transmitted to our servers. You can even use the tool offline once the page is loaded.

How often should I change my passwords?

Current NIST (National Institute of Standards and Technology) recommendations advise against systematic periodic changes, which push users to choose weak passwords. Change your passwords only if you suspect compromise or after a confirmed data breach.

Why exclude ambiguous characters?

Ambiguous characters (0/O, 1/l/I) look similar in certain fonts, which can be problematic if you need to manually enter the password. This option is useful for passwords you might need to read visually, but it slightly reduces the character pool.