SHA-256 Hash Generator: Online Free Secure Hashing

How to generate a SHA-256 hash

1. Type or paste the text you want to hash into the input panel. If Live Hash is enabled, the output refreshes automatically while you type.
2. Turn Live Hash Off if you want to control when the digest is calculated, then click the Generate SHA-256 button when ready.
3. Read the output in the hash panel. The result is a 64-character hexadecimal digest generated from your input.
4. Use the copy button to send the hash to a clipboard, notes, or a checksum compare step.

Example

These examples match the real SHA-256 algorithm used by the tool and are verified against the actual digest output.

What SHA-256 is used for

• File integrity checks: A downloaded file can be verified by comparing its SHA-256 digest to the publisher’s checksum.
• Git commit hashes: Git uses SHA-1 for object IDs in older setups and SHA-256 in some newer workflows; these hashes identify content and changes without revealing the content itself.
• Data fingerprinting: A digest can identify whether data changed, even if the original content is not stored.
• Digital signatures: Many signature schemes use a hash such as SHA-256 as a digest of the message before signing.
• Blockchain and distribution records: Hashes are commonly used to represent transaction or file state in systems that rely on digest comparison.

SHA-256 is not a password-storage algorithm. It is fast, deterministic, and unsalted, which is why password hashes should use bcrypt, scrypt, or Argon2 instead.

SHA-256 vs SHA-512 vs MD5

SHA-1 and MD5 are both broken for collision resistance. For modern security work, use SHA-256 or a stronger variant such as SHA-512.

Generate a SHA-256 hash in code

const text = 'hello';
const bytes = new TextEncoder().encode(text);
const digest = await crypto.subtle.digest('SHA-256', bytes);
const hex = Array.from(new Uint8Array(digest))
  .map((b) => b.toString(16).padStart(2, '0'))
  .join('');
console.log(hex);

import hashlib
print(hashlib.sha256(b'hello').hexdigest())

package main

import (
  "crypto/sha256"
  "fmt"
)

func main() {
  sum := sha256.Sum256([]byte("hello"))
  fmt.Printf("%x
", sum)
}

Verifying a file checksum

A real-world use for SHA-256 is verifying that a downloaded file matches the publisher’s checksum. After downloading a file, run the command below and compare the digest to the official value.

sha256sum your-file.zip

Get-FileHash .\your-file.zip -Algorithm SHA256

Privacy

This tool hashes while you type when Live Hash is enabled. If Live Hash is turned off, the hash is generated only when you click the Generate SHA-256 button. The hash calculation happens in the browser with the JavaScript crypto library, and no network request is made to hash your input.

FAQ

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