People say encrypted when they mean hashed, and the mix-up causes real damage - usually when someone converts a list of values to SHA-256, deletes the originals, and then asks how to decrypt them back. There is no decrypt. This page draws the line between the two ideas so it never happens to you.
Encryption and hashing both turn readable data into unreadable-looking characters, which is exactly where the confusion starts. But they were built for opposite jobs. Encryption is a locked box: whatever goes in is meant to come back out, and the key decides who can open it. A hash is a fingerprint: it identifies the input and proves it has not changed, and it is designed so that nobody can reconstruct the input from it. SHA-256, the algorithm in the bulk converter video, is firmly on the fingerprint side.
Think of encryption as putting a letter in a locked box. The letter still exists inside, complete and readable, and anyone with the key can take it out and read it exactly as written. Password managers, encrypted drives and secure messaging all work this way - the whole point is getting the original back.
A hash is like a fingerprint lifted from a person. The fingerprint identifies them and can be matched against another fingerprint, but you cannot rebuild the person from it. SHA-256 digests your input through a one-way mathematical scramble. The original data is not stored inside the hash in any form - not compressed, not encoded, not hidden. It is gone by design.
Every few days someone searches for how to decrypt a SHA-256 hash, sometimes offering to pay for the key. No such key exists, for anyone, including the algorithm's designers. If a website or a person claims they can decrypt SHA-256 for you, they are either guessing inputs and hashing them to compare - brute force, which only works on short, predictable inputs - or they are running a scam.
This matters for the bulk number converter. The moment your list is hashed, that file is a one-way door. If the original list matters, back it up first. The hash file can prove and match, but it can never give the numbers back.
Run SHA-256 on the word hello on any machine in the world and you get 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824, every single time. That reliability is what makes hashing useful for matching lists, spotting duplicate files and checking downloads.
Encryption deliberately does the opposite. Good encryption tools add randomness so the same file encrypted twice produces two completely different outputs - otherwise patterns would leak. So when a tool promises that identical inputs will always produce identical outputs, you are looking at hashing, and you should expect all of hashing's limits along with its benefits.
Watch the video to see SHA-256 explained simply, then the bulk conversion done live with the Python script.
Watch Full VideoNo. There is no password and no key in hashing at all. The only way to find what produced a hash is to guess inputs, hash them, and compare - which works only for short or common inputs like phone numbers and simple passwords.
Neither is weaker - they do different jobs. Hashing is stronger for proving data is unchanged and for matching, because there is nothing to steal that unlocks it. Encryption is the only choice when the original data must be read again.
The wording is wrong and so is the method. Passwords should be stored with a slow, salted password hashing function such as bcrypt or Argon2, not a fast general hash like SHA-256. The password storage page explains why in full.