SHA-256 Generator - Free, No Sign-Up Required
Overview
SHA-256 produces a 256-bit (64-character hex) digest used to verify file integrity, store passwords (with a salt), and sign data in HMAC-SHA256. The tool uses the browser's SubtleCrypto API, the same engine behind HTTPS and modern web authentication, so the output matches any server-side SHA-256 implementation exactly.
How to Use This Tool
Type or paste text, or drop a file. The SHA-256 hash appears as a 64-character hex string. For HMAC-SHA256, enable the HMAC toggle, enter a secret key, and the tool computes the keyed hash. Both modes run in your browser with no network requests.
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PDF Tool →Frequently Asked Questions
What is SHA-256 used for?
SHA-256 is used for verifying file integrity (checksums), signing JWT tokens (HMAC-SHA256), generating API request signatures (AWS SigV4, Stripe webhooks), and deriving keys in password hashing schemes like PBKDF2.
Can two different inputs produce the same SHA-256 hash?
Theoretically yes (collision), but SHA-256 has a 2^256 output space, making accidental or intentional collisions computationally infeasible with current technology. No known practical SHA-256 collision has been produced.
Is SHA-256 safe for storing passwords?
No, not alone. Plain SHA-256 is too fast, making it vulnerable to brute-force attacks. Password storage requires a slow, salted algorithm like bcrypt, scrypt, or Argon2. SHA-256 is appropriate as a building block inside PBKDF2 with many iterations.