SHA-256 Hash Generator — Free Online Tool
Generate SHA-256 cryptographic hash values from text or files online for free. Runs in your browser — your data is never uploaded. Instant result.
About SHA-256 Generator
SHA-256 (Secure Hash Algorithm 256-bit) produces a 64-character hexadecimal hash value and is the current gold standard for cryptographic hashing. Unlike MD5, SHA-256 is collision-resistant and remains secure for most applications including digital signatures, certificate generation, blockchain transactions, and data integrity verification. Our generator computes SHA-256 hashes from text strings or uploaded files entirely in your browser using the Web Crypto API — your data never touches any server.
Frequently Asked Questions
What is SHA-256 used for?
Password hashing (with bcrypt or PBKDF2), digital signatures, SSL/TLS certificates, blockchain, and file integrity verification.
Is SHA-256 more secure than MD5?
Yes — SHA-256 is significantly more secure. MD5 has known collision vulnerabilities.
Can I hash a file?
Yes — upload any file and get its SHA-256 checksum without the file leaving your browser.
What is HMAC-SHA256?
HMAC-SHA256 is a keyed version of SHA-256 that uses a secret key to authenticate messages. Used in API authentication and JWTs.
Is my data sent to your servers?
No — hashing runs locally using the browser's built-in Web Crypto API.