SHA-256 Hash Generator Online — Industry Standard Cryptographic Hash
All 4 algorithms simultaneously · HMAC mode · File hashing · Compare · Batch · 100% browser-side
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MD5 · SHA-1 · SHA-256 · SHA-512 · Real-time
SHA-256 is the industry standard cryptographic hash — used in SSL/TLS certificates, Bitcoin blockchain, code signing, and API authentication. Generates a 256-bit (64 hex char) hash. Enable HMAC mode for HMAC-SHA256 API signatures.
What is a Hash Function?
A hash function converts any input — text, password, file — into a fixed-length string of hexadecimal characters. The same input always produces the same hash, but even a single character change produces a completely different hash. Hashes are one-way — you cannot reverse them to recover the original input.
MD5 vs SHA-1 vs SHA-256 vs SHA-512
MD5 (128-bit, 32 hex chars) is fast and widely used for non-security checksums but is cryptographically broken. SHA-1 (160-bit, 40 hex chars) is deprecated for security use since 2017. SHA-256 (256-bit, 64 hex chars) is the current industry standard — used in SSL certificates, Bitcoin, and code signing. SHA-512 (512-bit, 128 hex chars) offers maximum security for highly sensitive applications.
Frequently Asked Questions
What is SHA-256?
SHA-256 (Secure Hash Algorithm 256-bit) is part of the SHA-2 family developed by the NSA. It produces a 64-character hex hash and is currently considered secure for all cryptographic applications.
Where is SHA-256 used?
SHA-256 is used in SSL/TLS certificates, Bitcoin mining and transactions, code signing (Apple, Microsoft), HTTPS certificate fingerprints, Git commit IDs, and HMAC-SHA256 for API authentication.
Is SHA-256 unbreakable?
No hash is theoretically unbreakable, but SHA-256 has no known practical attacks. With 2^256 possible outputs, a brute-force attack is computationally infeasible with any foreseeable technology.
SHA-256 vs SHA-512 — which is better?
Both are secure. SHA-512 is theoretically stronger (512-bit vs 256-bit) but both exceed current security needs. SHA-256 is faster on 32-bit systems; SHA-512 is faster on 64-bit. Choose SHA-256 for compatibility, SHA-512 for maximum security.
How do I use HMAC-SHA256 for API auth?
Enable HMAC mode, enter your API secret key, and paste the request body or message. The HMAC-SHA256 output is your signature. Compare with the signature in the API documentation to verify.