SHA-256 Generator Online

SHA-256 is the workhorse of modern cryptographic hashing — used in TLS certificates, code signing, blockchain transactions, and secure password storage (as the basis for PBKDF2 and HMAC-SHA256). This tool generates a SHA-256 hash from any text string.

How it works

The generator computes SHA-256 client-side using the browser's built-in SubtleCrypto API (part of the Web Crypto standard). Your input is processed in your browser and the 64-character hexadecimal hash is returned — nothing is transmitted to a server.

How to use it

1. Type or paste your input text
2. Click Generate Hash (or the hash updates automatically as you type)
3. Copy the 64-character hexadecimal output

A few things worth knowing

• Fixed output length: SHA-256 always produces a 256-bit (64 hex character) digest regardless of input size
• Deterministic: The same input always produces exactly the same hash — this is what makes it useful for integrity verification
• One-way: You cannot reverse a SHA-256 hash. There is no algorithm that recovers the original input from the hash
• Salting for passwords: If you're using SHA-256 to hash passwords, you must add a unique salt per password. Better still, use a purpose-built password hashing function like bcrypt or Argon2 that handles salting and work factor automatically

FAQ

What's the difference between SHA-256 and MD5? SHA-256 produces a 256-bit digest vs MD5's 128-bit. More importantly, SHA-256 has no known practical collision vulnerabilities, while MD5 does. Use SHA-256 for anything where integrity actually matters.

Can two different strings produce the same SHA-256 hash? Theoretically yes (all hash functions have collisions), but no practical collision has ever been found for SHA-256. For all real-world purposes, the output is unique.

Is it safe to hash sensitive data here? Yes — the hash is computed locally in your browser using the Web Crypto API. Your input is never sent to a server.

Related Tools

• SHA-512 Hash Generator
• MD5 Hash Generator