Password Generator
Generate strong random passwords with custom length, symbols, and character sets. Free browser-based — no passwords stored or transmitted.
How Password Generator Works
Generates passwords using crypto.getRandomValues() — the browser's cryptographic RNG, not Math.random(). Configure length (8–128), character sets (uppercase, lowercase, numbers, symbols), and ambiguous character exclusion.
This tool uses industry-standard formulas and calculations to provide accurate results instantly. All calculations happen in your browser — your data never leaves your device, ensuring complete privacy and security.
Whether you're optimizing marketing campaigns, managing finances, or processing data, this tool gives you the precision and speed you need to make informed decisions quickly.
Password Strength Recommendations
| Label | Meaning |
|---|---|
| 16+ chars, mixed set | NIST recommended minimum for general accounts |
| 20+ chars, mixed set | Strong — recommended for admin and email accounts |
| 12–15 chars, mixed set | Acceptable minimum for most sites |
| Below 12 chars | Weak — brute-forceable with modern hardware |
Frequently Asked Questions
Is this password generator secure?
Yes. Passwords are generated using crypto.getRandomValues() — the Web Crypto API's cryptographic random source. Nothing is transmitted to any server. The generated password is never stored. Close the browser tab and it's gone.
What makes a strong password?
Length matters most — a 20-character password with only lowercase is stronger than a 10-character password with all character types. NIST SP 800-63B (2023) recommends at least 15 characters and removing complexity rules in favour of length and uniqueness.
Should I include symbols?
Yes for maximum security, but verify the target site accepts them first. Some systems reject certain symbols (!, @, #) or have unexpected length limits. If a site rejects your generated password, use the 'exclude symbols' option.
Is my data stored?
No. Generated entirely in browser. Never transmitted.
Can I use this on mobile?
Yes.
About This Tool
Built by the Calcyo team and last updated June 2026. All calculations follow industry-standard methodology. No data leaves your browser — calculations run entirely client-side using JavaScript. If you spot an error in the formula or benchmark data, email us at support@calcyo.xyz.