Generate SHA-512 hashes from any text. 512-bit digest via the native Web Crypto API. Everything runs in your browser — nothing is transmitted.
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SHA-512 (Secure Hash Algorithm 512) is a cryptographic hash function from the SHA-2 family, designed by the NSA and published by NIST in 2001. It produces a fixed 512-bit (64-byte) hash value — rendered as a 128-character hexadecimal string.
SHA-512 operates on 64-bit words, making it faster than SHA-256 on 64-bit processors. It remains cryptographically secure with no known practical attacks. It's widely used in digital signatures, TLS certificates, blockchain systems, and anywhere strong data integrity is required.
| Algorithm | Output | Security | Speed (64-bit) | Use Case |
|---|---|---|---|---|
| MD5 | 128-bit | Broken | Fast | Legacy checksums only |
| SHA-1 | 160-bit | Broken | Fast | Deprecated everywhere |
| SHA-256 | 256-bit | Secure | Moderate | General purpose, Bitcoin |
| SHA-384 | 384-bit | Secure | Fast | TLS cipher suites |
| SHA-512 | 512-bit | Secure | Fastest* | Signatures, certificates |
| SHA-3 | Variable | Secure | Slower | Post-quantum readiness |
*SHA-512 is faster than SHA-256 on 64-bit CPUs because it uses 64-bit arithmetic operations natively.
SHA-512 is used with RSA, ECDSA, and EdDSA to create tamper-proof digital signatures. The 512-bit digest provides a large security margin, making it the preferred choice for signing critical documents and software packages.
TLS/SSL certificates use SHA-512 (or SHA-256) to sign certificate chains. Browsers and operating systems verify these signatures to establish trust between your device and websites.
SHA-512 verifies that files, messages, and database records haven't been tampered with. Unlike MD5, SHA-512 provides strong protection against adversarial collision attacks, making it suitable for security-critical integrity checks.
Some blockchain systems use SHA-512 in their consensus mechanisms and wallet generation. Ed25519 — used by Solana, Cardano, and others — internally uses SHA-512 for key derivation and signature computation.
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SHA-512 provides 256-bit security against quantum attacks (Grover's algorithm halves effective bit strength). This is considered sufficient for the foreseeable future. NIST has not recommended migrating away from SHA-2 for hashing purposes, even in post-quantum guidelines.
SHA-512 is actually faster than SHA-256 on 64-bit processors because it operates on 64-bit words. Use SHA-512 when you want maximum security margin or work with 64-bit systems. SHA-256 is fine for most applications and produces shorter hashes.
Raw SHA-512 is too fast for password hashing — attackers can compute billions of hashes per second. Use bcrypt, scrypt, or Argon2 instead, which are intentionally slow. SHA-512 is used internally by some password hashing schemes (like SHA-512/crypt in Linux).
SHA-2 is a set of hash functions designed by the NSA and published by NIST in 2001. It includes SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224, and SHA-512/256. All remain cryptographically secure with no practical attacks.
SHA-512 produces a 512-bit (64-byte) digest. In hexadecimal, each byte becomes 2 characters, resulting in 128 hex characters. The longer output provides a larger security margin against collision and preimage attacks compared to shorter hashes.