About the Hash Generator
The Hash Generator creates MD5, SHA-1, SHA-256 and other hashes from any text. A hash function turns input of any length into a fixed-length fingerprint. The same input always produces the same hash, and even a one-letter change produces a completely different result. Developers use hashes to verify file downloads, detect changes, build cache keys and compare data without storing the original.
How to Use the Hash Generator
- Type or paste the text you want to hash.
- Choose the algorithm, or view all supported hashes at once.
- Copy the hash in hexadecimal form.
- To verify data, hash it again and compare the two values exactly.
Which Algorithm Should I Use?
SHA-256 is the safe default for integrity checks, signatures and general purpose hashing. SHA-512 gives a longer output. MD5 and SHA-1 are fast and still appear in older systems and checksums, but they are broken for security purposes because attackers can create collisions. Do not use them for anything security-sensitive.
Hashing Passwords Correctly
Plain SHA-256 or MD5 is not suitable for storing passwords, because attackers can try billions of guesses per second. Use a slow, salted password hashing algorithm such as bcrypt, scrypt, Argon2 or PBKDF2. In ASP.NET Core, the built-in PasswordHasher handles this for you.
Example
The SHA-256 hash of hello is 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824. Change it to Hello and the hash is completely different. This avalanche effect is what makes hashes useful for detecting changes.
Frequently Asked Questions
Can a hash be reversed?
No, hashing is one-way. However, common short inputs can be guessed by trying many values, which is why passwords need salts and slow algorithms.
Why does my hash differ from another tool?
Check for extra spaces or new lines, letter case, and character encoding. Hashes are calculated on exact bytes.
Is MD5 still useful?
Only for non-security checksums and legacy compatibility. Prefer SHA-256 for new work.
What is a hash collision?
Two different inputs that produce the same hash. Collisions are practically impossible for SHA-256 but have been demonstrated for MD5 and SHA-1.