Generate secure, random passwords with customisable length and character options. Includes password strength checker with entropy scoring and visual strength bar. Free online tool.
What Is Strong Password Generator Online?
A password generator creates cryptographically random passwords that are virtually impossible to guess or crack through brute force. Unlike human-created passwords, which follow predictable patterns (capitalising the first letter, adding numbers at the end, common substitutions like @ for a), generated passwords are truly random, using every character position independently.
Password strength is measured in entropy — the number of bits of randomness. A 16-character password with uppercase, lowercase, numbers and symbols has approximately 105 bits of entropy, which would take billions of years to crack with current technology. This tool lets you customise the length, character types and format to meet any security requirement.
How to Use This Tool
Set your desired password length (16 characters or more is recommended).
Choose which character types to include: uppercase, lowercase, numbers, symbols.
Click "Generate" to create a random password.
View the strength rating and estimated crack time.
Copy the password and store it in your password manager.
Tips & Best Practices
Length is more important than complexity — a 20-character password with only letters is stronger than an 8-character password with all character types.
Never reuse passwords across different accounts — each account should have a unique password.
Use a password manager to store generated passwords — you should not need to memorise them.
For memorable passwords, use a passphrase of 4–5 random unrelated words (e.g. "correct horse battery staple").
Enable two-factor authentication (2FA) wherever possible for an additional layer of security.
Common Use Cases
Creating strong, unique passwords for every online account.
Generating API keys, tokens and secret strings for development.
Meeting specific password requirements (minimum length, required character types) for different services.
Creating temporary passwords for shared accounts or new user accounts.
Frequently Asked Questions
What makes a password strong?
A strong password is at least 16 characters long and includes a mix of uppercase letters, lowercase letters, numbers and symbols. Avoid dictionary words, personal information and common patterns.
Are the generated passwords stored anywhere?
No. Passwords are generated entirely in your browser using cryptographically secure random numbers. They are never sent to any server or stored anywhere.