SHA-512 Checksum Calculator

SHA-512 produces a 512-bit digest, doubling SHA-256's output. This makes it ideal for applications requiring maximum collision resistance — such as long-term archival integrity, high-security password hashing (e.g. SHA-512/crypt), and cryptographic key derivation.

Unlike SHA-256, SHA-512 operates natively on 64-bit word arithmetic, making it faster than SHA-256 on modern 64-bit hardware for large inputs — while remaining constant-time and side-channel resistant.

SHA-512 is used in RSA-SHA512 and ECDSA-SHA512 signatures for high-assurance environments such as government PKI, code-signing certificates, and TLS 1.3 handshakes where maximum hash strength is mandated.

SHA-512 is part of the SHA-2 family, designed by the NSA and published by NIST in 2001. It produces a 512-bit (64-byte) digest, always represented as a 128-character hexadecimal string — regardless of input size.

With a 512-bit output space, a brute-force collision requires ~2²⁵⁶ operations — vastly exceeding even SHA-256's security margin. No practical attack or collision against SHA-512 has ever been demonstrated.

This tool uses window.crypto.subtle.digest('SHA-512', …) — a native browser API with no external dependencies. The implementation is FIPS-certified on supporting platforms and significantly faster than any pure-JavaScript alternative.