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Strong Password Generator

Create strong passwords with high entropy

Strength
Length: 20

Generated in your browser and not uploaded to our servers during creation.

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A strong password is your first and most important line of defense against unauthorized access. Yet many people still use passwords that can be cracked quickly -- dictionary words, birthdays, pet names, or slight variations of "password123." Attackers do not guess manually; they use automated tools that test huge numbers of combinations per second. A stronger password is typically longer, more random, and drawn from a larger character set.

Coda One's Strong Password Generator uses your browser's Web Crypto API to generate passwords with high entropy. The default output uses 20+ characters combining uppercase, lowercase, numbers, and symbols. The built-in entropy meter shows an estimate of how resistant each password is to guessing, measured in bits.

Password generation happens in your browser. No server request is needed for generation, and generated passwords are not uploaded to our servers. Use the tool to create distinct passwords for email, banking, social media, work accounts, or any other login you manage. Pair them with a password manager so you do not need to memorize every random string yourself.

Frequently Asked Questions

What makes a password "strong" in 2026?
A strong password in 2026 should be at least 16 characters long, use a mix of uppercase, lowercase, numbers, and symbols, and be completely random -- not based on words, patterns, or personal information. Our generator creates passwords with 100+ bits of entropy, which would take billions of years to crack with current hardware.
How does the entropy meter work?
Entropy measures randomness in bits. It is calculated as password length multiplied by log2 of the character set size. A 20-character password using all four character types (uppercase, lowercase, digits, symbols) has about 131 bits of entropy. Above 80 bits is considered strong; above 100 is very strong.
Is this generator truly random?
Yes. We use the Web Crypto API (crypto.getRandomValues), which provides cryptographic-grade randomness from your operating system. This is fundamentally different from Math.random(), which is predictable and should never be used for security purposes.
Should I use a different strong password for every account?
Absolutely. Reusing passwords means one breach exposes all your accounts. Use this generator to create a unique strong password for every service, and store them in a password manager like Bitwarden, 1Password, or KeePass. You only need to memorize one master password.
Can I generate strong passwords on my phone?
Yes. This tool works fully in any modern mobile browser -- Chrome, Safari, Firefox, or Edge. No app download needed. The same Web Crypto API powers the generation on mobile devices, so your passwords are equally secure regardless of which device you use.

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