Secure Password Generator
This secure password generator creates strong, random passwords right in your browser. Choose the length and which character types to include — uppercase letters, lowercase letters, numbers and symbols — and get a fresh password instantly. Because it uses your browser's cryptographic random number generator and never contacts a server, the passwords you create are private to you: nothing is transmitted, logged or stored anywhere.
Your password
Passwords are generated locally in your browser: nothing is stored or sent to any server.
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How it works
The generator builds a character pool from the options you enable (A–Z, a–z, 0–9 and a set of symbols). It then asks the browser's built-in Web Crypto API for cryptographically secure random values and maps each one onto a character in the pool, one per position, until it reaches the length you chose. Because the randomness comes from crypto.getRandomValues rather than Math.random, the result is unpredictable and suitable for real passwords. Every calculation happens locally on your device, so no password ever leaves your browser.
How long a password takes to crack
The time an attacker needs to guess a password by brute force depends above all on its length and the variety of characters. These are rough orders of magnitude against a modern attack; the exact figures change with the hardware, but the trend is clear: every extra character and every new character type multiplies the effort.
| Length and composition | Estimated time to crack |
|---|---|
| 8, lowercase only | Instant |
| 8, uppercase + numbers + symbols | Hours |
| 12, mix of all four types | Centuries |
| 16, mix of all four types | Practically infeasible |
Security best practices
Generating a strong password is only the first step. Use a password manager to create and remember a different password for every site, so a breach at one service does not compromise the rest. Do not reuse the same password across accounts and do not base it on personal details that are easy to find out. Turn on two-factor authentication (2FA) whenever it is available: even if your password is stolen, the second factor would still be needed. Aim for a minimum of 12 to 16 characters, and for passwords you have to memorise consider a passphrase: several random words are long, easy to remember and very hard to guess.
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Preguntas frecuentes
- What makes a password secure?
- A secure password is long, random and mixes character types — uppercase, lowercase, numbers and symbols. Randomness matters most: avoid names, dates, dictionary words or keyboard patterns, because those are the first things attackers try. A password made of unpredictable characters, like the ones this tool generates, is far harder to guess or crack.
- How long should my password be?
- Aim for at least 12 characters, and 16 or more for important accounts such as email, banking or password managers. Each extra character multiplies the number of possible combinations, so length is the single most effective way to make a password harder to crack. This generator lets you go up to 64 characters.
- Should I use symbols and numbers?
- Yes. Enabling all four character types (uppercase, lowercase, numbers and symbols) enlarges the pool of possible characters and makes each position less predictable. If a particular site rejects certain symbols, turn that option off and add a couple of extra characters of length to compensate.
- Are these passwords really private?
- Yes. The generator runs entirely in your browser using the Web Crypto API. No password is ever sent over the network, logged, or stored — not even by this site. When you close the page, the password is gone unless you saved it yourself.
- How should I store the passwords I generate?
- The safest option is a reputable password manager, which encrypts and remembers a unique password for every account so you only memorise one master password. Avoid reusing passwords across sites and never store them in plain text files or notes that sync unencrypted.