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SHA512 Hash Generator 128-Char Hash, HMAC & More

Generate SHA512 hashes from text or files the 512-bit high-security standard. Verify integrity, run HMAC-SHA512 for JWT HS512 and high-security APIs, visualize the avalanche effect across all 128 characters, and batch-hash multiple inputs. All in your browser, nothing uploaded.

Always Free 512-bit · 128 hex chars File hashing HMAC-SHA512
Text · File · Batch · HMAC · Avalanche (128 chars) · Identicon
✅ Secure 512 bits, no known practical attacks
Hash any file client-side nothing ever uploaded
Avalanche across 128 characters the most dramatic visualization
SHA512 produces a 128-character hash (512 bits) twice the length of SHA256. Faster than SHA256 on 64-bit hardware. Used for JWT HS512, high-security APIs, and Linux password hashing (SHA512crypt).
Input text
0 chars
SHA512 Secure high security 128 hex chars
Algorithm comparison
AlgorithmBitsHex length64-bit speedSecurity
MD512832Fastest⚠️ Broken
SHA116040Fast⚠️ Deprecated
SHA25625664Fast✅ Secure standard
SHA512 ← you are here512128Faster than SHA256✅ Secure high security

What makes it different

Every other SHA512 tool
does one thing. This does ten.

File hashing, verification, HMAC, batch, format detection, identicons, hash chains and the most dramatic avalanche visualization on the internet, across 128 characters.

512 bits of security

SHA512 produces a 128-character hash twice SHA256's length. No known practical attacks. Faster than SHA256 on 64-bit hardware due to 64-bit word operations.

high security standard

Most dramatic avalanche

128 characters of SHA512 hash all changing when you alter one input character the most visually compelling avalanche visualization in any free tool.

128-char diff, highlighted

HMAC-SHA512

Generate HMAC-SHA512 for JWT HS512 tokens and high-security APIs. Same Web Crypto API used by your browser's own TLS implementation.

JWT HS512 · high-sec APIs

All 4 hashes from one file

Drop a file and get MD5, SHA1, SHA256, and SHA512 simultaneously all computed client-side with a progress bar, nothing uploaded.

4 hashes · 1 drop

Verification mode

Compare a computed SHA512 hash against an expected 128-character value get an instant match result with exact character diff count.

128-char integrity check

Hash identicon

512 bits of entropy drive a richer, more varied identicon pattern than shorter hashes download as PNG.

richest visual fingerprint

Quick guide

Generate SHA512 hashes in seconds

Seven tools in one text, file, verify, batch, HMAC, detect, avalanche.

1

Choose your mode

Text for quick hashing, File for large files, Verify for integrity checks, HMAC for JWT HS512 signing.

2

Type, paste, or drop

128-character hash updates live as you type. Drop any file all four algorithms run simultaneously with a progress bar.

3

Copy, verify, or explore

Copy the hash, verify it, sign a JWT payload with HMAC, or watch 128 characters change in the Avalanche visualizer.

SHA512 the high-security standard explained

SHA512 is part of the SHA-2 family, designed by the NSA and published by NIST in 2001 alongside SHA256. Both are secure with no known practical attacks, but SHA512 offers a significantly longer hash 512 bits (128 hexadecimal characters) versus SHA256's 256 bits (64 characters).

Why SHA512 is faster than SHA256 on modern hardware

This surprises most people. SHA256 operates on 32-bit words, processing 512 bits at a time. SHA512 operates on 64-bit words, processing 1024 bits at a time. On modern 64-bit hardware, each 64-bit operation takes the same CPU time as a 32-bit operation, so SHA512 can hash roughly twice as much data per operation. In practice, SHA512 is 25–50% faster than SHA256 on 64-bit CPUs for the same amount of data. On 32-bit hardware (rare today), SHA256 is faster.

SHA512 vs SHA256 when does it matter? For most web applications, both are equally secure and the speed difference is negligible. SHA512 is preferred when: (1) you need a longer hash output for a specific protocol like JWT HS512, (2) you are running on guaranteed 64-bit hardware and want to maximize throughput for bulk hashing, or (3) you want extra security margin for long-lived keys or signatures.

SHA512 in password hashing

SHA512 alone is not suitable for password hashing it is too fast, making brute-force attacks easy. However, SHA512 is used as the underlying primitive in SHA512crypt, the default password hashing scheme on Linux systems (used in /etc/shadow), and in PBKDF2-SHA512. These schemes add thousands of rounds of iteration and a random salt, making brute-force computationally expensive regardless of the underlying hash speed.

Use caseRecommendedWhy
File checksumsSHA256 or SHA512Both secure, SHA256 more widely checked
Digital signaturesSHA256 or SHA512Both secure
JWT tokensHS256 (SHA256) or HS512 (SHA512)HS512 for higher security margin
Password hashingbcrypt / Argon2SHA512 alone is too fast
High-throughput bulk hashing on 64-bitSHA512Faster than SHA256 on 64-bit hardware
API webhooksHMAC-SHA256 or HMAC-SHA512Both secure; SHA512 for extra margin

The avalanche effect at 128 characters

The avalanche effect where a tiny input change produces a completely different output is most visually striking in SHA512 due to its 128-character length. Change one letter in your input and typically 110–120 of the 128 hex characters will change. Try the Avalanche tab above to see this in real time. This dramatic visual difference is what makes SHA512 identicons so varied and unique compared to shorter hash algorithms.

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FAQ

SHA512 questions,
answered.

Everything about SHA512 security, speed, and when to use it over SHA256.

Ask a question
SHA512 is a cryptographic hash function from the SHA-2 family producing a 512-bit (128 hexadecimal character) hash. It is secure with no known practical attacks, and is faster than SHA256 on 64-bit hardware. It is used for JWT HS512 tokens, high-security API signing, and as the underlying function in Linux password hashing (SHA512crypt).
On 64-bit hardware (virtually all modern computers), SHA512 is typically 25–50% faster than SHA256 because it operates on 64-bit words while SHA256 uses 32-bit words. Each 64-bit operation takes the same time as a 32-bit one on a 64-bit CPU, so SHA512 processes twice as much data per operation. On 32-bit hardware, SHA256 is faster.
Both are secure with no known practical attacks. SHA256 is the more widely supported standard and recommended for most applications. SHA512 is preferred when you need a longer hash, when running on 64-bit hardware and want maximum throughput, or when using JWT HS512. The security difference is theoretical both are far beyond any realistic attack.
HMAC-SHA512 is used for JWT tokens with the HS512 algorithm, high-security API request signing, and situations where a longer MAC output is required. It provides a stronger security margin than HMAC-SHA256 at comparable or better speed on 64-bit hardware.
Not alone. SHA512 is too fast for direct password hashing modern hardware can compute billions of SHA512 hashes per second. SHA512 is used as the underlying primitive in SHA512crypt and PBKDF2-SHA512, which add salting and many rounds of iteration to make brute-force slow. For passwords, use bcrypt, scrypt, or Argon2.
No. All file hashing uses the Web Crypto API built into your browser and runs entirely client-side. Your files are never sent to any server and can be hashed offline once the page has loaded.