A hash is one-way
The same input always produces the same digest, and there is no way back. That is what makes hashes useful for checking that a file arrived intact, and useless as a way to store something you need to read again.
Do not hash passwords this way
Plain SHA-256 is far too fast for password storage — a modern GPU tries billions per second. Passwords want a slow, salted function built for the job: bcrypt, scrypt or Argon2.
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Frequently asked questions
Q. Why is the digest always the same length?
By design. SHA-256 always returns 256 bits, written as 64 hex characters, whether the input was one letter or a gigabyte.
Q. Can two inputs give the same hash?
In principle yes — there are more possible inputs than digests. In practice no one has produced a SHA-256 collision, and finding one deliberately is considered infeasible.
Q. Does the text leave my browser?
No. The Web Crypto API in your browser does the hashing. Nothing is sent anywhere.