Live Hash Generator
updates as you type
Algorithm
Your Password
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Algorithm
MD5
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Hash Output
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MD5 Hash
128 bits · 32 hex chars
Hash will appear here as you type...
Avalanche Effect
one character change = completely different hash
Change one character in a password and the entire hash changes — not just one character in the output, but the whole thing. This is called the avalanche effect and it's a required property of secure hash functions.
Base Password
Salt Demo
why two identical passwords can have different hashes
Without a salt, every user with the password "password" has the exact same hash. An attacker cracks one, they crack them all. A salt is a random string added to the password before hashing — making every hash unique even for identical passwords.
Enable Salting
Toggle to see the difference salting makes
Password
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→ Hash
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Two users, same password — what the database sees:
User A
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User B
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Key Concepts
One-Way Function
You can turn a password into a hash instantly. You cannot turn a hash back into the password. It's a one-way street — mathematically irreversible.
Fixed Length Output
"cat" and the entire text of Harry Potter produce hashes of exactly the same length. The input size doesn't matter — the output is always the same size.
Avalanche Effect
Change one character in the input and the entire hash changes completely. This makes it impossible to guess what the original input was from a small change in output.
Salting
A random value added before hashing. Means two users with the same password get different hashes — defeating rainbow tables and bulk cracking attacks.
Collisions
When two different inputs produce the same hash. MD5 and SHA-1 have known collision attacks — one reason they're no longer trusted for security purposes.
Rainbow Tables
Pre-computed databases of hashes for common passwords. If your password is "password123" and it's unsalted, the attacker already knows the hash before they start.