SHA-512 Hash Generator — 128-Character Digests in Your Browser
Compute SHA-512 or SHA-384 hashes for any text or file using the browser-native Web Crypto API — no server upload, no tracking. Includes HMAC-SHA512 for high-security API signing, hash comparison, and a multi-algorithm panel for side-by-side digest comparison.
HMAC requires a secret key and a message. Both are required to produce the authentication code.
Drop any file to compute all its hashes in your browser. The file is never uploaded to any server.
Drop file here or click to browse
How to Use the SHA-512 Hash Generator
- On the Text Hash tab, choose SHA-512 or SHA-384 with the algorithm toggle, then type or paste text — the digest appears immediately.
- Toggle Uppercase or Lowercase hex output to match your target system's format.
- Switch to HMAC Mode, select HMAC-SHA512 or HMAC-SHA384, enter your secret key and message to generate a keyed authentication code.
- Use Hash Compare to paste an expected hash value and verify it matches — choose the correct algorithm variant first.
- Open Multi-Hash to view MD5, SHA-1, SHA-256, and SHA-512 simultaneously for any input.
- In the File Hash tab, drop any local file to compute all four hash values in your browser — the file is never uploaded.
Key Features
- SHA-512 and SHA-384 algorithm toggle: Switch between the two strongest SHA-2 variants without leaving the tool.
- HMAC-SHA512 and HMAC-SHA384: Generate keyed authentication codes for high-security API signing and token issuance.
- Fully client-side via Web Crypto API: All hashing runs in the browser — your text and files are never transmitted anywhere.
- Live hashing: SHA-512 output updates as you type in the Text Hash tab.
- Hash comparison: Instantly verify whether a computed digest matches an expected value.
- File hashing with multi-algorithm output: Drop any file to see MD5, SHA-1, SHA-256, and SHA-512 simultaneously.
- Offline capable: Works without internet access once the page has loaded.
Use Cases
High-Security File Integrity Verification
Security tools, cryptographic libraries, and operating system kernels are often distributed with SHA-512 checksums. Drop the downloaded file into the File Hash tab to verify its SHA-512 digest against the published value. SHA-512 provides a larger security margin than SHA-256 and is the preferred checksum format for security-critical software.
HMAC-SHA512 for High-Value API Authentication
Applications handling financial transactions, healthcare data, or other high-value payloads often use HMAC-SHA512 for request signing to provide a greater security margin than HMAC-SHA256. The HMAC tab lets you generate and verify HMAC-SHA512 codes for development and testing.
SHA-384 for TLS Cipher Suite Compatibility
SHA-384 is used in TLS 1.2 cipher suites such as TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384. When debugging TLS handshakes, certificate chains, or testing server configurations that require SHA-384, this tool computes the correct digest without any software installation.
Digital Signature Verification
RSA-SHA512 and ECDSA-SHA512 signatures are used in high-security certificate authorities and code-signing workflows. Computing the SHA-512 digest of a document or code artifact is the first step in manual signature verification, and this tool handles that step entirely in the browser.
Algorithm Comparison and Education
The Multi-Hash tab shows MD5, SHA-1, SHA-256, and SHA-512 outputs side by side for the same input. The visible difference in digest length (32 vs 40 vs 64 vs 128 hex characters) and the avalanche effect across all four algorithms make this a practical tool for teaching and exploring cryptographic hash functions.
FAQ's
A SHA-512 hash is always exactly 128 hexadecimal characters (512 bits = 64 bytes = 128 hex digits), regardless of input size. SHA-384 produces 96 hex characters (384 bits = 48 bytes).
SHA-512 provides a larger security margin — 256-bit collision resistance versus 128-bit for SHA-256 — and is faster than SHA-256 on 64-bit processors because it processes 64-bit word blocks. For most web applications, SHA-256 is entirely sufficient. SHA-512 is preferred when extra security margin or specific protocol compatibility is required.
SHA-384 is a truncated variant of SHA-512 that uses a different initialization vector and produces a 96-character hex digest. It is the hash function used in TLS 1.2 cipher suites like TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 and is a good choice when a shorter digest than SHA-512 is needed without losing the architectural advantages of 64-bit processing.
No. SHA-512 is a fast hash function — modern GPUs can compute billions of SHA-512 hashes per second. This makes it unsuitable for raw password storage. Always use bcrypt, scrypt, or Argon2id for passwords. These algorithms are intentionally slow and include automatic salting, making brute-force attacks impractical.
HMAC-SHA512 is used for signing high-value API requests, securing JSON Web Tokens with HS512, and webhook verification where maximum signature security is required. It combines SHA-512 with a secret key to produce a 128-character authentication code that cannot be forged without the key.
Yes. Once this page has loaded, all file hashing works entirely offline. Files are read using the browser's FileReader API and processed by the Web Crypto API. No data is sent to any server at any point.
SHA-256 operates on 32-bit words, while SHA-512 uses 64-bit words. On 64-bit CPUs — which are now universal for desktops, servers, and modern mobile devices — SHA-512 can process data in fewer instruction cycles, making it measurably faster than SHA-256 for large inputs despite producing a longer digest.
All hashing runs locally in your browser via the Web Crypto API. No text, file content, or keys are transmitted to any server. That said, avoid pasting production secrets (private keys, API tokens) into any browser-based tool as a general security practice.