Finance & Economics / Blockchain & Crypto
SHA-256 Hash Calculator
Any text input will produce a unique 256-bit hash
SHA-256 Hash Function
What is SHA-256?
SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function that produces a 256-bit (32-byte) hash value, typically displayed as 64 hexadecimal characters.
Key Properties:
- Deterministic: Same input always produces same output
- One-way: Cannot reverse the hash to get original input
- Avalanche Effect: Small input change = completely different hash
- Collision Resistant: Nearly impossible to find two inputs with same hash
- Fixed Size: Always 256 bits, regardless of input size
Cryptocurrency Use Cases:
- Bitcoin Mining: Proof-of-Work requires finding hashes below target
- Block Hashing: Each block's hash links to previous block
- Transaction IDs: Hash of transaction data
- Merkle Trees: Hierarchical hashing of transactions
- Address Generation: Part of deriving Bitcoin addresses
Example Hashes:
Input: "Hello, World!"
Hash: dffd6021bb2bd5b0af676290809ec3a53191dd81c7f70a4b28688a362182986f
Input: "Hello, World!!" (one extra !)
Hash: d14a91c1b3e7b1dfaeb4fa78d793b5856e6e33c4edea28097e062bd13e61e42e
Notice: Tiny input change = completely different hash
💡 Important Notes:
- SHA-256 is used in Bitcoin's Proof-of-Work
- It's part of the SHA-2 family (SHA-224, SHA-256, SHA-384, SHA-512)
- Designed by the NSA, published by NIST in 2001
- This calculator uses browser's native Web Crypto API
- Never hash passwords without salt - use bcrypt/scrypt instead
Use this sha-256 hash calculator to compute blockchain & crypto results from your inputs.