Secure Password Generator
Generate strong, random passwords with customizable length and character sets using this free online tool. No sign-up required, runs entirely in your browser.
What Is a Secure Password Generator?
A secure password generator creates random, unpredictable passwords using a cryptographically secure random number generator (CSPRNG). Unlike human-chosen passwords that tend to follow predictable patterns, generated passwords draw from a uniform distribution across the selected character set, maximizing entropy per character. Password strength is measured in bits of entropy — calculated as length × log₂(charset size). A 16-character password using uppercase, lowercase, digits, and symbols provides roughly 105 bits of entropy, which is considered very strong against brute-force attacks even with modern hardware.
How to Use This Password Generator
- Adjust the password length using the slider (default is 16 characters).
- Toggle character types: uppercase, lowercase, digits, and symbols.
- Optionally exclude ambiguous characters (like l, I, 1, O, 0) in the exclude field.
- A new password is generated automatically when you change any setting.
- Use the Bulk Generate section to create multiple passwords at once.
Common Use Cases for Password Generation
- Creating unique passwords for each account — Generate a different strong password for every online account to limit the damage from a single data breach.
- Database and API credentials — Generate long, high-entropy passwords for database users, API keys, and service accounts where human memorability is not needed.
- Wi-Fi and network passwords — Create strong WPA2/WPA3 passwords for routers and access points to prevent unauthorized network access.
- Temporary or one-time passwords — Quickly generate disposable passwords for temporary access, test accounts, or short-lived tokens.
- Seed data for development — Generate bulk passwords for seeding user databases in development and testing environments.