How to Use the Hash Generator
- Type or paste the text you want to hash.
- Choose an algorithm: SHA-256, SHA-384, or SHA-512.
- The hash is generated instantly and shown in hexadecimal format.
- Click "Copy" to copy the hash to your clipboard.
What is hashing?
A hash function takes an input of any size and deterministically produces a fixed-length output. SHA-256 always produces 256 bits (64 hex characters), no matter whether you hash one character or one gigabyte of text. Hashing is one-way: it is computationally infeasible to reconstruct the original input from the hash alone.
Hashing vs. encryption
These are often confused but serve different purposes. Encryption is reversible — with the right key, you can decrypt ciphertext back into the original data. Hashing is one-way by design; there is no key that "un-hashes" a value. That is exactly why hashing is used for things like verifying file integrity or storing password hashes, where you never need to recover the original input, only compare it.
Common uses
Hashes are used to verify that a downloaded file has not been corrupted or tampered with, to detect duplicate data, as part of digital signatures, and as a building block in password storage systems (though real password storage adds salting and slow, purpose-built algorithms like bcrypt or Argon2 rather than a single raw SHA-2 hash).
Example
hello
2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824
Tips
- Hashes cannot be "decrypted" — if you need to recover original data, you need encryption, not hashing.
- A single-character change in the input produces a completely different hash (this is called the avalanche effect).
- For password storage, use a dedicated password-hashing algorithm (bcrypt, scrypt, Argon2), not a raw SHA-2 hash.
Frequently Asked Questions
Can a hash be reversed back into the original text?
No, not directly. Hash functions are one-way by design. The only practical way to "crack" a hash is to guess inputs and hash them until one matches, which is why weak or predictable inputs are risky.
Is SHA-256 encryption?
No. SHA-256 is a hash function, not an encryption algorithm. It cannot be decrypted because it was never encrypted in the first place.
Is my text sent to a server to be hashed?
No. Hashing is performed locally using your browser's built-in Web Crypto API.
Which algorithm should I use?
SHA-256 is the most widely used and sufficient for most purposes like checksums. SHA-384 and SHA-512 produce longer digests and are used where a larger security margin is desired.