Can a SHA-256 hash be reversed?

No. SHA-256 is one-way — you cannot recover the input from the digest. Identical inputs always hash to the same value, which is what makes hashes useful for integrity checks and lookups.

Should I use SHA-256 to store passwords?

No. Plain SHA-256 is too fast for passwords. Use a slow, salted password hash such as bcrypt, scrypt, or Argon2 designed to resist brute-force attacks.

Answer

How to generate a SHA-256 hash of a string

Generate the SHA-256 hash of any text instantly in your browser. Free, private, nothing uploaded.

SHA-256 is a one-way cryptographic hash that turns any input into a fixed 64-character (256-bit) hex digest. Paste your text into a hash tool to get it — for example, the SHA-256 of "hello" is 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824.

Input

hello

Output

2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824

The same input always yields the same digest; the smallest change produces a completely different one.

Open the Hash Generator → Free · runs in your browser · nothing uploaded

Steps

Open the Hash tool and paste your text.
Read the SHA-256 digest (also available: MD5, SHA-1, SHA-512, CRC32).
Copy the 64-character hex digest.
For keyed integrity (HMAC), use the HMAC tool with a secret key instead.

Frequently asked questions

Can a SHA-256 hash be reversed?: No. SHA-256 is one-way — you cannot recover the input from the digest. Identical inputs always hash to the same value, which is what makes hashes useful for integrity checks and lookups.
Should I use SHA-256 to store passwords?: No. Plain SHA-256 is too fast for passwords. Use a slow, salted password hash such as bcrypt, scrypt, or Argon2 designed to resist brute-force attacks.

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