Hash Generator

Text

Result

SHA-256083a13c03c3dc61f2ba7bca0a675ca63b0c7e811e2ea685eaf414dc6248eb9ff
MD58e223d9a23dbeaa9b1fd45f20accc83b
CRC3273df8690
SHA-256 uppercase083A13C03C3DC61F2BA7BCA0A675CA63B0C7E811E2EA685EAF414DC6248EB9FF
UTF-8 bytes15

Three algorithms for three different jobs

Computes SHA-256, MD5 and CRC32 of any string in the browser — nothing is sent anywhere.

A hash is a fixed-length fingerprint of data. The same input always gives the same output, and changing one character changes the result entirely. Verifying a file arrived intact, or comparing two strings without revealing them, are the usual reasons to want one.

The three algorithms are not decoration. SHA-256 is fit for security work, MD5 has been broken for years and suits only integrity checks, and CRC32 is not cryptographic at all — it catches accidental transmission errors and computes instantly.

What this calculator shows

SHA-256 in lower and upper case
MD5 and CRC32 for integrity checking
The UTF-8 byte length, which differs from the character count

What to keep in mind

Everything runs locally in the browser; the text is never uploaded.
Encoding is UTF-8, so a Cyrillic string hashes differently from visually similar Latin text.

FAQs

Can a hash be reversed?

No, hashing is one-way. Sites offering to "decrypt MD5" simply look the value up in a database of precomputed hashes of common passwords.

Why is MD5 considered unsafe?

Collisions have been found: two different files can be made to share a hash. It is unfit for signatures or passwords, though still adequate against accidental corruption.

What should hash passwords?

None of these — they are far too fast. Passwords need bcrypt, scrypt or Argon2, which are deliberately slow and salted.

Why bother with CRC32?

It is much faster and only eight characters long. Its job is spotting accidental corruption in transit, not resisting forgery, which is why zip archives and Ethernet use it.

Worked example

Hashing a short string

Input: Hello, UniTools

Output: SHA-256 beginning 8b8a2b…

Note: Change one letter and the hash changes completely rather than partially. That property is called the avalanche effect and underpins every use of hashing.

Useful links

All tools in Dev Tools

Hash Generator

Result

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