SHA-512 Hash Generator

SHA-512 (Secure Hash Algorithm 512-bit) is part of the SHA-2 family, designed by the NSA and standardized in 2001. It produces a 512-bit (64-byte) hash value, displayed as a 128-character hexadecimal string. SHA-512 processes input in 1024-bit blocks through 80 rounds of operations using 64-bit words on a 512-bit internal state. The 64-bit operations make SHA-512 faster than SHA-256 on most 64-bit CPUs.

Use this SHA-512 generator: paste text into the input box for instant hashing, or drop a file onto the File tab. The 128-character SHA-512 hash appears immediately, computed in your browser via the Web Crypto API. Free, no signup, no upload.

SHA-512 provides a larger security margin: 256 bits of collision resistance vs 128 bits for SHA-256. Both are considered secure for practical purposes in 2026 — there are no known attacks against either. SHA-512 is preferred for applications requiring long-term security (decades of resistance), or where the protocol benefits from a larger output size. For most applications, SHA-256 is sufficient and more widely supported.

SHA-512 is used in Linux password hashing ($6$ format in /etc/shadow), some TLS 1.3 cipher suites, NSA Suite B cryptography, IPsec, OpenPGP, Bitcoin in some implementations (Stratum mining protocol), Ed25519 signature scheme (uses SHA-512 internally), high-security file integrity verification, and long-term archival systems where digest collisions over decades are a concern.

A SHA-512 hash is 512 bits = 64 bytes. In hexadecimal it is exactly 128 characters. In Base64 it is 88 characters with padding. The empty string hashes to cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e.

On 64-bit CPUs without hardware crypto acceleration, SHA-512 is typically 30-50% faster than SHA-256 because it uses native 64-bit operations. On 32-bit systems or with hardware acceleration (Intel SHA-NI, ARM Crypto Extensions), SHA-256 is often faster because the hardware is optimized for 32-bit SHA-2. For most use cases the difference is negligible.

No — SHA-512 cannot be efficiently reversed. With 256 bits of collision resistance and 512 bits of preimage resistance, finding a preimage would require ~2^512 operations, far beyond any conceivable computation. Even Grover's quantum algorithm would only reduce preimage attacks to ~2^256 — still infeasible. SHA-512 is one of the most resistant hash functions to brute force currently in widespread use.

Yes — modern Linux distributions (since ~2010) use SHA-512 by default for password hashing in /etc/shadow. Password lines starting with $6$ indicate SHA-512 crypt format with a random salt and 5000 default iterations. While SHA-512-crypt is more secure than older crypt formats, modern systems should use bcrypt, scrypt, or Argon2id for new applications.

Bitcoin's core protocol uses SHA-256 (specifically double SHA-256), not SHA-512. However, SHA-512 appears in some related contexts: BIP-32 hierarchical deterministic wallets use HMAC-SHA-512 for key derivation, and some altcoins and mining protocols use SHA-512.