About SHA-256 Hash Generator
The SHA-256 Hash Generator computes a secure SHA-256 cryptographic hash from any text string. The result is a 64-character hexadecimal digest. Hashes update in real-time as you type.
SHA-256 is part of the SHA-2 family and is the industry standard for cryptographic hashing. It is used in digital signatures (TLS/SSL, code signing), blockchain (Bitcoin proof-of-work, Ethereum), HMAC authentication, data integrity verification, and certificate fingerprints.
Hashing uses the browser's built-in Web Crypto API (SubtleCrypto.digest), ensuring high performance and security. Your data never leaves your device.
How to Use SHA-256 Hash Generator
Type or paste your text into the input.
The SHA-256 hash is generated in real-time using the browser's Web Crypto API.
Copy the 64-character hexadecimal digest.
Examples
Frequently Asked Questions
Is SHA-256 computed in the browser?
Yes — the Web Crypto API (SubtleCrypto.digest) is used for all hashing. Nothing is sent to a server.
What is the difference between SHA-256 and MD5?
SHA-256 produces a 256-bit (64 hex character) hash and is cryptographically secure. MD5 produces a 128-bit (32 hex character) hash and is cryptographically broken. Use SHA-256 for any security-sensitive application.
Can SHA-256 hashes be reversed?
No — SHA-256 is a one-way function. It is computationally infeasible to determine the input from the hash output. This is what makes it suitable for security applications.
Is SHA-256 suitable for password hashing?
Not on its own — SHA-256 is too fast, making brute-force attacks feasible. For passwords, use a dedicated slow hash function like bcrypt, scrypt, or Argon2.
What is HMAC-SHA256?
HMAC-SHA256 is a keyed hash function that combines SHA-256 with a secret key to produce a message authentication code (MAC). It is used for API authentication and data integrity verification.
What is SHA-256 used for in blockchain?
Bitcoin uses SHA-256 for its proof-of-work mining algorithm and for hashing transaction data into the blockchain. The double-SHA-256 (SHA256d) variant is specifically used in Bitcoin.