オンラインパスワードジェネレーター
カスタム長さと文字セットで強力なランダムパスワードを生成します。
What Is Password Generator?
Password Generator is a free online tool that creates strong, random passwords using your browser's cryptographically secure random number generator. You can customize the password length (4–64 characters) and choose which character sets to include — uppercase letters, lowercase letters, digits, and symbols — to meet any password policy requirement.
How to Use Password Generator
- Set the desired password length using the slider.
- Select the character sets to include: uppercase, lowercase, digits, and/or symbols.
- Choose how many passwords to generate (1–20).
- Click Generate and copy any password to your clipboard.
Features
- Cryptographically secure random generation via Web Crypto API
- Configurable length from 4 to 64 characters
- Toggle uppercase, lowercase, digits, and symbols
- Generate up to 20 passwords at once
- Password strength indicator for each result
- Runs entirely in your browser — zero data uploaded
FAQ
How are passwords generated?
Passwords are generated using the browser's built-in crypto.getRandomValues() API, which provides cryptographically secure random numbers. No server is involved.
What makes a strong password?
A strong password is at least 12 characters long and includes a mix of uppercase letters, lowercase letters, numbers, and symbols. Longer passwords with more character variety are harder to crack.
Are generated passwords stored anywhere?
No. Passwords are generated entirely in your browser and never sent to any server. They exist only in your browser memory until you close or refresh the page.