SHA-512 Hash Generator - Free, No Sign-Up
Overview
SHA-512 produces a 512-bit digest encoded as 128 hexadecimal characters. It is slower than SHA-256 but offers a larger security margin, making it the preferred choice for password-based key derivation (PBKDF2-HMAC-SHA512) and high-security HMAC signatures. The tool uses the browser's SubtleCrypto API for exact, native computation.
How to Use This Tool
Paste text or drop a file. The 128-character SHA-512 hex string appears immediately. Enable HMAC mode and enter a secret key for HMAC-SHA512 output. Both text and binary file inputs are supported. The output matches openssl dgst -sha512 on the same input.
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PDF Tool →Frequently Asked Questions
When should I use SHA-512 instead of SHA-256?
SHA-512 is preferred when you need the longest standard digest, for instance in PBKDF2-HMAC-SHA512 key derivation, bcrypt alternatives, or systems that require 512-bit integrity guarantees. For most API signatures and file checksums, SHA-256 is sufficient.
Is SHA-512 slower than SHA-256?
On 64-bit CPUs, SHA-512 can be faster than SHA-256 per byte because it processes 1024-bit blocks compared to SHA-256's 512-bit blocks. On 32-bit hardware, SHA-512 is significantly slower. Browser performance depends on the native SubtleCrypto implementation.
Does HMAC-SHA512 use the full 512-bit key?
HMAC uses the key as-is if it is 128 bytes (1024 bits) or shorter. If the key exceeds 128 bytes, it is hashed with SHA-512 first. A 32-byte secret key is common and provides 256 bits of key entropy, which is sufficient for HMAC-SHA512.