What is Strong Password Generator?
This strong password generator runs entirely in your browser. The length slider spans 6 to 64 characters (default 16), with independent toggles for uppercase letters, lowercase letters, numbers, and symbols (!@#$%^&*()_+-=[]{}|;:,.<>?). A built-in strength meter scores the result across 5 criteria (length ≥12, length ≥16, mixed case, digits, symbols) and labels it weak, fair, strong, very strong, or excellent. Copy the password with one click. Generation is fully local — passwords never leave your device. Great for signups, account management, and security policy testing.
▶Use Cases5 scenarios
- ◆Passwords for website and app signups
- ◆Rotating personal account passwords
- ◆Sample passwords for security policy tests
- ◆Temporary credentials for teams
- ◆Demonstrating strong password standards
▶How to Use5 steps
- 1Set the length with the slider (6-64)
- 2Check the character types to include
- 3Click Generate Password
- 4Check the 5-level strength rating
- 5Copy the password with one click
▶Features8 features
- ✓Free
- ✓No signup
- ✓6-64 adjustable length
- ✓Four character types, freely combined
- ✓5-level strength meter
- ✓One-click copy
- ✓100% client-side
- ✓Works on mobile
▶FAQ10 questions
What is a strong password generator?
An online random password tool. Input: length (6-64) and character type options. Output: a random password matching your rules plus a 5-level strength rating. Used for signups, rotation, and policy tests. Generation is fully local.
What is the default length?
16 characters. The slider ranges from 6 to 64.
Which character types are available?
Uppercase A-Z, lowercase a-z, digits 0-9, and symbols !@#$%^&*()_+-=[]{}|;:,.<>? — each toggleable independently.
How is strength measured?
Five criteria are checked: length ≥12, length ≥16, mixed case, digits, and symbols. The more criteria met, the higher the 5-level rating.
Are generated passwords secure?
They are generated locally with a large character set; a 16-character password using all four types carries roughly 95 bits of entropy.
Is my password uploaded?
No. Everything runs in your browser; nothing is sent to any server.
Can I require at least one uppercase letter?
Yes — checking Uppercase guarantees uppercase in the result. If no type is checked, no password is generated.
How many passwords can I generate at once?
The tool generates one password per click. For bulk generation, use the batch mode to create up to 100 passwords at once.
Are the passwords truly random?
They use the browser's crypto.getRandomValues() API, which provides cryptographically secure random numbers. This is suitable for password generation.
Can I exclude ambiguous characters?
Yes. Enable the "Exclude ambiguous" option to remove characters like 0/O, 1/l/I that look similar. This reduces the character set slightly but improves readability.