SHA512 Encrypt/Decrypt

What is Online SHA512 Encrypt/Decrypt?

SHA512 Encrypt/Decrypt is a free online tool for generating SHA512 hashes from strings and decrypting SHA512 hashes to strings. In other words, this tool is a combination of SHA512 hash generator and SHA512 decrypter. SHA512 is a hashing function that creates a unique 512-bit hash with 128 characters long for every string. After MD5 started to lose its popularity because of its vulnerabilities, people started to look for new hashing functions as a replacement. SHA256 and SHA512 was founded for this purpose which have more strength for collusions than MD5 and have less vulnerabilities.

People are asking whether to use SHA256 or SHA512, which one is safer and what is the main difference between SHA256 and SHA512. The main difference is SHA256 generates a 64 characters long output while SHA512 generates 128. That means SHA512 is more collusion resistant. In terms of security, they are identical because both are open to dictionary attacks and brute force attacks. If you want to hash your passwords in your databases, think twice since short length strings which converted to SHA256 or SHA512 can be easily cracked/decrypted with modern computers as this tool offers. In terms of storage, people tend to use SHA256 because it takes up half space in the database.

Here is a representation of how SHA512 encoder decoder works; there are two different strings with different character lengths, both produces unique SHA512 hashes with 128 characters long.

SHA512 Encrypt and Decrypt

Encryption and decryption process is same for SHA256 and SHA512. It can be decrypted either by a dictionary attack or a brute force attack. This tool uses a list which includes most common 100k passwords for the first method. If this does not work, you can skip to the second method which is more time consuming.

How to use Online SHA512 Encrypt/Decrypt?

You can encode or decode your string into/from SHA512 by following the guide below.

1. Generating a SHA512 has is straightforward. Just enter your text into input area and press "Encrypt" button.
2. For SHA512 decryption, best practice is to use default settings first which looks for a common password dictionary. If there is no result, you can widen your trials by extending character sets which is available in "Decryption Settings".

Frequently asked questions

Can this reverse a SHA-512 hash back to the original text?

No. The function is one-way by construction — any input, however large, becomes a fixed 512 bits, so there is nothing left to reverse. Sites advertising hash decryption are searching precomputed tables.

Is SHA-512 slower than SHA-256?

Usually the opposite, which surprises people. It works on 64-bit words, so on 64-bit hardware it often runs faster despite producing twice the output. On 32-bit systems the ranking flips.

Should I use it instead of SHA-256?

Either is a sound choice. SHA-256 is more widely assumed by other systems; SHA-512 gives a larger margin and may be quicker on your hardware. Interoperability is usually the deciding factor, not security.

Does the longer output make it more secure?

More margin, yes, but SHA-256 has no practical weakness to improve on. The extra length matters for very long-lived signatures and for standards that specify a higher security level.

Why 128 characters?

512 bits in hexadecimal. Fixed regardless of what went in.

What about the shorter variants?

SHA384 is a truncated form of this one, and SHA256 is the usual default across the Security Tools.