Strong Password Generator
Enter a length from 8 to 128 and this generator builds a random password containing at least one uppercase letter, one lowercase letter, one digit and one symbol, then shuffles the characters. Each run produces a different password.
What this calculator does
The Strong Password Generator estimates your result instantly from the values you enter, using standard math & conversions formulas. Enter a length from 8 to 128 and this generator builds a random password containing at least one uppercase letter, one lowercase letter, one digit and one symbol, then shuffles the characters. Each run produces a different password. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate rather than a certified or official figure.
Result
About Strong Password Generator
The Strong Password Generator builds a random password of the length you choose (8 to 128 characters). It guarantees at least one uppercase letter, one lowercase letter, one digit and one symbol from !@#$%^&*()-_=+, fills the rest from all four sets, then shuffles the order. It runs in your browser using JavaScript's Math.random.
Calculation Example
Enter Password Length 16 and click Calculate. The Password box fills with a random 16-character string of the form K7#mQ2p!vX9zR4$w (an illustration only — the actual output changes every time you click), and the note reads 'Generated a 16-character password with upper, lower, digit and symbol characters.'
Key Benefits
- Generates passwords from 8 to 128 characters long
- Guarantees at least one uppercase, lowercase, digit and symbol
- Shuffles the characters so the required types are not in fixed positions
- Produces a fresh password on every calculation
How to Use this Calculator
-
Enter a length
Type a password length between 8 and 128. -
Generate
Click Calculate. -
Copy the password
Read the generated string from the Password box.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Any rate or interval you enter is assumed to hold for the whole period unless the form asks for it separately.
- Results use standard published formulas and account only for the values entered above.
- Rounding is applied for display; the underlying calculation uses your full precision.
- Results are returned in the same units you enter, unless the tool states the output unit.
What it does not cover
- Strong Password Generator produces a calculated result for reference and learning, not a certified or official measurement.
- Real-world outcomes differ when tolerances, rounding rules or local standards apply.
- Definitions and standards vary by region and change over time; verify the convention that applies to your case.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For work where the result carries real consequences, confirm it against an authoritative source.
Frequently Asked Questions
Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.