SHA-512 is part of the SHA-2 family and produces a 512-bit (128 hex character) hash. It provides stronger collision resistance than SHA-256, making it suitable for high-security applications. This tool uses the browser's built-in Web Crypto API — your data never leaves your device.
SHA-512 is the 64-bit member of the SHA-2 family. It uses the same Merkle-Damgård construction as SHA-256 but operates on 64-bit words and an 80-round compression function, producing a 512-bit (128 hex character) digest. On 64-bit CPUs it is typically faster than SHA-256 for inputs over a few hundred bytes.
The 256-bit collision resistance and 512-bit preimage resistance put it well beyond brute force, which is why it appears in TLS, HMAC, password key-derivation (Argon2id, bcrypt-sha512) and large-file integrity workflows. This calculator uses the browser's Web Crypto API and matches openssl dgst -sha512 exactly.
When you need higher collision resistance (256-bit vs 128-bit) or you're hashing large amounts of data on a 64-bit CPU — SHA-512's 64-bit internal arithmetic outperforms SHA-256's 32-bit on long inputs. For short messages, SHA-256 is usually faster on 32-bit and ARM platforms.
No. Like SHA-256, the full internal state is exposed in the output, so an attacker who knows H(secret + data) can compute H(secret + data + padding + extra) without knowing the secret. Use HMAC-SHA-512 if you're building a MAC; use SHA-512/256 if you need length-extension resistance.
They share the digest size (512 bits) but nothing else. SHA-512 uses Merkle-Damgård with a 64-bit Davies-Meyer compression function. SHA-3-512 (Keccak) uses a sponge construction. Both are NIST-standardised; SHA-3 was added as a structurally different alternative, not a replacement.
512 bits = 64 bytes, and each byte is rendered as two lowercase hex characters, giving 128 characters total. The same digest in Base64 would be about 88 characters, and in raw bytes 64.
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