SHA-256 Generator
Hash FunctionsProcessed locally in your browser using the Web Crypto API. Nothing is sent to any server.
How It Works
This tool computes the SHA-256 hash of your input using the browser's built-in
crypto.subtle.digest() API — the same Web Crypto API used by security professionals.
Algorithm Details
- Algorithm: SHA-256 (SHA-2 family, designed by NSA)
- Output size: 256 bits (32 bytes, displayed as 64 hex characters)
- Block size: 512 bits
- Implementation:
crypto.subtle.digest('SHA-256', data)— native browser, no JavaScript libraries - Input encoding: UTF-8 via
TextEncoder
Common Use Cases
- Verifying file integrity (downloaded files often provide SHA-256 checksums)
- Storing password hashes in databases
- Digital signatures and certificate generation
- Blockchain proof-of-work (Bitcoin uses double SHA-256)
- Git commit hashing
Frequently Asked Questions
What is SHA-256?
SHA-256 is a cryptographic hash function that produces a fixed 256-bit output. Part of the SHA-2 family designed by the NSA, it is used in digital signatures, certificates, and blockchain technology.
Is SHA-256 reversible?
No. SHA-256 is a one-way function — you cannot recover the original input from its hash. This makes it ideal for password storage and data integrity verification.
Can two inputs produce the same hash?
Theoretically possible (a "collision"), but the probability is ~1 in 2^128 — computationally infeasible with current technology.
Privacy Note
This tool runs entirely in your browser. Your input is never uploaded, stored, or sent to any server.
Disclaimer: This tool is provided for educational and informational purposes only. The results do not constitute professional security advice. Use at your own discretion.