What is Password Generator?
The Password Generator is a client-side tool that creates cryptographically secure passwords and passphrases using your browser's Web Crypto API (crypto.getRandomValues). Unlike pseudo-random generators, the Web Crypto API sources entropy from your operating system's secure random number generator, ensuring that generated passwords are truly unpredictable and suitable for protecting sensitive accounts, encryption keys, API secrets, and database credentials. The tool offers two generation modes: character-based passwords (customizable mix of uppercase, lowercase, digits, and symbols) and word-based passphrases (random words from a curated dictionary, joined by a separator). Each generated password includes an entropy score and an estimated crack time based on current computing capabilities.
Why Use Password Generator?
Weak and reused passwords remain the leading cause of account compromises worldwide. Humans are notoriously bad at generating random strings — we fall into patterns, favor familiar characters, and underestimate what attackers can guess. This tool removes human bias entirely by producing passwords with maximum entropy for any given length and character set. The entropy estimation is not just a vague strength meter; it calculates the exact number of bits of randomness and estimates how long a brute-force attack would take at various speeds (from consumer hardware to nation-state clusters). For teams, the passphrase mode generates memorable but strong alternatives like 'correct-horse-battery-staple' that are easier to type and remember while still providing excellent security.
How to Use
Choose your generation mode: 'Password' for character-based or 'Passphrase' for word-based. For passwords, set the length (8–128 characters) and toggle character sets: uppercase (A–Z), lowercase (a–z), digits (0–9), symbols (!@#$%^&*), and ambiguous characters (0/O, l/1/I). For passphrases, set the number of words (3–10), choose a separator (hyphen, space, period, or none), and optionally capitalize each word. Click 'Generate' to create a password. The strength indicator shows entropy bits and estimated crack time. Generate multiple passwords at once and pick the one you prefer. Copy to clipboard with a single click.
Example Usage
You need a strong password for a production database. Set length to 24, enable all character sets, and exclude ambiguous characters (to avoid confusion when manually entering the password). Click 'Generate' and receive something like 'k$9Fy!mQ2xR#vN7pWz@jC4sE'. The entropy display shows 148 bits, and the estimated crack time at 10 billion guesses per second is trillions of years. Alternatively, for a WiFi password that guests need to type manually, switch to passphrase mode: 4 words, hyphen separator, producing 'marble-sunset-kingdom-forge' — 55 bits of entropy, memorable, and easy to communicate verbally.
Benefits
Cryptographic-quality randomness from the Web Crypto API ensures passwords cannot be predicted or reproduced. Customizable character sets and length let you meet any password policy requirements. The entropy calculator provides transparent, quantitative security analysis rather than vague colored bars. Passphrase mode offers a human-friendly alternative without sacrificing security. Bulk generation lets you create multiple candidates and choose your preference. No passwords are stored or transmitted — generation happens entirely in your browser.