Generate secure, random 64-character passwords. 421 bits of entropy — maximum strength. Everything runs in your browser.
Use ⌘ + D to bookmark this toolA 64-character password provides 421 bits of entropy. At this length, you're generating a cryptographic key rather than a traditional password. The number of possible combinations exceeds the number of atoms in the observable universe by a factor of 10⁴¹. This is used exclusively for machine-to-machine secrets where maximum theoretical security is required.
Entropy is calculated as: length × log₂(pool_size). With 64 characters from the full 95-char printable ASCII set, you get 421 bits of entropy. Brute-force time at 10 billion guesses/sec: ∞.
50 pre-generated examples. Use the generator above for a cryptographically fresh password — these are for illustration only.
HMAC-SHA512 requires a 64-byte key for full security. Ed25519 private keys are 64 bytes. Some enterprise token systems (Vault, CyberArk) generate 64-character secrets by default. AWS Lambda function URLs use 64-character authentication tokens.
JWT HS512 secrets and webhook HMAC-SHA512 verification keys require 64 bytes for full cryptographic strength. Using shorter keys reduces the effective security of the HMAC.
Hardware Security Module (HSM) wrapping keys, root encryption keys, and master key material. These protect the entire cryptographic hierarchy of an organization.
Forward-looking secrets designed to resist quantum attacks. With 421 bits, Grover's algorithm would still face 210+ bits of effective security — far beyond any conceivable quantum computer.
Encryption keys for data that must remain confidential for 50+ years — medical records, legal documents, trade secrets, and government archives. Maximum key length provides maximum future-proofing.
| Length | Entropy | Crack Time (GPU) | Rating | Recommended For |
|---|---|---|---|---|
| 6 chars | 39 bits | 3.5 seconds | Weak | temporary or throwaway accounts only |
| 8 chars | 53 bits | 1.3 days | Fair | low-security accounts where the site enforces rate limiting |
| 10 chars | 66 bits | 117 years | Good | general-purpose accounts and social media |
| 12 chars | 79 bits | 1.1 million years | Strong | general accounts |
| 14 chars | 92 bits | 10 billion years | Strong | sensitive accounts |
| 15 chars | 99 bits | 894 billion years | Excellent | business accounts |
| 16 chars | 105 bits | 84 trillion years | Excellent | master passwords |
| 20 chars | 132 bits | 7 × 10²¹ years | Overkill | master passwords |
| 24 chars | 158 bits | 6 × 10²⁹ years | Overkill | maximum security |
| 32 chars | 211 bits | 4 × 10⁴⁵ years | Overkill | encryption keys |
| 48 chars | 316 bits | ∞ | Maximum | cryptographic secrets and machine-to-machine authentication |
| 64 chars | 421 bits | ∞ | Maximum | cryptographic keys |
Crack times assume 10 billion guesses/sec (GPU cluster with MD5). Bcrypt/Argon2 hashing makes these 10,000x–100,000x slower.
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Yes. A 64-character password using uppercase, lowercase, numbers, and symbols provides 421 bits of entropy — well beyond what brute-force attacks can crack. It would take ∞ to break with current GPU technology.
With a modern GPU cluster computing 10 billion hashes per second, a random 64-character password using all character types (95-char pool) would take approximately ∞ to crack by brute force. Using only lowercase letters would be significantly faster to crack.
Both matter, but length has a greater impact. Each additional character multiplies the total combinations by the pool size (up to 95 for all printable ASCII). However, using all character types (uppercase, lowercase, numbers, symbols) maximizes the pool size, which also multiplies security exponentially.
Yes. You cannot reliably memorize unique random passwords for every account. A password manager securely stores all your passwords behind one strong master password, and can auto-fill them across devices and browsers.
A 64-character password is recommended for: cryptographic keys, HMAC secrets, and token signing. Always use the strongest password practical for each account, and never reuse passwords across sites.