SHA512 Hash
Free online SHA-512 hash tool with four modes: text, file, batch line-by-line, and HMAC. Computes locally in your browser with no server upload. Toggle freely between SHA-512, SHA-384, and SHA-512/256.
Related
What is SHA-512?
SHA-512 is the longest-output member of the SHA-2 family, standardized by NIST in FIPS 180-2 (2001). It accepts input of any length and produces a 512-bit digest (128 hexadecimal characters).
**Compared to SHA-256:** SHA-512's output is twice as long. On 64-bit CPUs, SHA-512 is typically faster than SHA-256 (word size matches the native registers); on 32-bit CPUs, SHA-256 wins.
**Typical uses:** ① Digital signatures (RSA, ECDSA); ② TLS / HTTPS protocols; ③ HMAC construction inside cryptographic protocols; ④ Integrity verification of distributed software packages; ⑤ Content fingerprinting in high-security scenarios.
**Security status:** SHA-512 is still collision-resistant today (no known practical collisions) and is recommended for new projects. Plan to migrate to SHA-3 / BLAKE3 once post-quantum cryptography becomes standard.
Use Cases
- Verify integrity of software installers and mirror files against published hashes
- Generate content fingerprints for digital signatures and certificate workflows
- Produce message digests inside TLS / HTTPS protocols
- Derive keys and authenticate messages using HMAC-SHA512
- Use as a content-addressable identifier in databases or caches (avoid storing full plaintext)
- Receiver-side verification of data transferred across systems
How to Use
- Pick a mode: text, file, batch line-by-line, or HMAC.
- Provide input: paste text into the editor, drop a file, paste multiple lines, or enter your HMAC key.
- The tool computes SHA-512 instantly and shows a 128-character hex result; switch between hex / base64 and upper/lower case as needed.
- Optionally switch variants (SHA-512 / SHA-384 / SHA-512/256) or paste a known hash to compare.
Features
- Four modes: text, file, batch line-by-line, and HMAC
- Local browser compute via Web Crypto API; nothing is uploaded
- Three SHA-512 variants: SHA-512 / SHA-384 / SHA-512/256
- Chunked file hashing: large files supported with live progress
- HMAC-SHA512 with utf8 / hex / base64 key encodings
- Multi-algorithm side-by-side output: MD5 / SHA-1 / SHA-256 / SHA-384 / SHA-512
- Known-hash comparison: paste a target hash to verify against
- Full Unicode support including Chinese characters and Emoji
Best Practices
Standardize encoding
different character encodings (UTF-8 vs Latin1) produce different hashes, so confirm the encoding matches across systems before verification.
Compare case-insensitively
hex digits' case does not affect equality — lowercase both sides before comparing.
Never store passwords with SHA-512
SHA-512 is too fast; use PBKDF2 / bcrypt / scrypt / Argon2 instead.
HMAC vs plain hash
HMAC-SHA512 authenticates messages with a key, while plain SHA-512 fingerprints content without a key.
SHA-512 vs SHA-512/256
choose SHA-512 when you need the full 128-character output; choose SHA-512/256 when you need 64 characters but want SHA-512's resistance.
FAQ
How long is a SHA-512 output?
SHA-512 outputs 512 bits, shown as 128 hexadecimal characters. SHA-384 outputs 96 characters, and SHA-512/256 outputs 64 characters.
SHA-512 or SHA-256 — which should I choose?
SHA-256 is plenty secure for most use cases. SHA-512 is faster on 64-bit CPUs and offers stronger collision resistance, making it a strong fit for high-security, performance-sensitive workloads.
Is SHA-512 an encryption algorithm?
No. SHA-512 is a one-way hash function; in theory you cannot reverse a digest back to its input. Calling it 'SHA-512 encryption' is imprecise — this tool only computes hashes.
Is SHA-512 secure?
Yes, it is still collision-resistant with no known practical collisions. Consider migrating to SHA-3 / BLAKE3 once post-quantum cryptography becomes standard.
Can I store passwords with SHA-512 directly?
No. SHA-512 is too fast and can be brute-forced with GPUs. Use a dedicated slow hash such as PBKDF2 (with salt and high iteration count), bcrypt, scrypt, or Argon2.
What is the difference between SHA-384 and SHA-512/256?
SHA-384 outputs 384 bits (96 chars), taken from a different offset of the full SHA-512 computation. SHA-512/256 outputs 256 bits (64 chars) using different initial values. Both belong to the SHA-2 family with comparable security strength.
What is HMAC-SHA512?
HMAC-SHA512 is a message authentication code built on SHA-512 that authenticates messages with a secret key. The HMAC mode here supports utf8 / hex / base64 key encodings.
Will hashing a large file freeze the page?
No. Files are processed in streamed chunks rather than loaded entirely into memory, so multi-GB files hash smoothly and the UI stays responsive.
Is anything uploaded to a server?
No. The tool computes inside your browser via the Web Crypto API; both text and files remain on your device.
Glossary
- SHA-512
- A 512-bit cryptographic hash function and the longest-output member of the SHA-2 family. Still collision-resistant; recommended for high-security use.
- SHA-384
- A truncated variant of SHA-512 that outputs 384 bits (96 hex chars). A member of the SHA-2 family.
- SHA-512/256
- A truncated variant of SHA-512 that outputs 256 bits (64 hex chars). Preserves SHA-512's collision resistance while matching SHA-256's length.
- SHA-2 family
- The series of algorithms SHA-256 / SHA-384 / SHA-512, standardized by NIST in FIPS 180-2. This tool supports three variants: SHA-512, SHA-384, and SHA-512/256.
- Hex encoding
- The usual way to display a hash digest. SHA-512's 512-bit output equals 128 hexadecimal characters.
- Collision resistance
- The property that no two distinct inputs can be found that produce the same hash. SHA-512 retains this property today.
- Web Crypto API
- The browser's built-in cryptography interface, offering hardware-accelerated SHA-1 / SHA-256 / SHA-384 / SHA-512. This tool uses it to compute locally.
SHA-2 family algorithm comparison
SHA-512 is the longest-output member of the SHA-2 family.
| Algorithm | Output bits | Hex length | Block bits | Typical use |
|---|---|---|---|---|
SHA-256 | 256 | 64 | 512 | General default |
SHA-384 | 384 | 96 | 1024 | High security |
SHA-512 | 512 | 128 | 1024 | High security / 64-bit CPUs |
SHA-512/256 | 256 | 64 | 1024 | 256-bit length with SHA-512 resistance |
Common hash algorithm performance reference
Approximate performance numbers; actual values depend on browser and hardware.
| Algorithm | 64-bit CPU | 32-bit CPU | Current status |
|---|---|---|---|
SHA-256 | Medium | Fast | Secure |
SHA-512 | Fast | Slow | Secure |
SHA-1 | Fast | Fast | Collision attacks exist |
MD5 | Very fast | Very fast | Collision / preimage attacks exist |
Typical SHA-512 application scenarios
Covers protocol-layer, signature-layer, and engineering-practice use.
| Scenario | Why SHA-512 | Core value |
|---|---|---|
| Software distribution fingerprint | Collision resistance, long output | Download verification |
| TLS 1.3 protocol | Recommended by RFC 8446 | HTTPS security |
| HMAC-SHA512 | Resistant to length-extension attacks | Message authentication |
| Database content fingerprint | 128-character hex output | Deduplication / cache key |
| Digital signatures | Pairs with RSA / ECDSA | Signature integrity |
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