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MD5 Generator

Generate MD5 hash from text or string.

How to Use MD5 Generator

1

Paste the exact string to hash into the box, remembering that spaces and letter case are significant.

2

Optionally add a salt or prefix value if the system you are matching uses one.

3

Click the "Process" button to generate the 32-character MD5 digest in lowercase hex.

4

Compare it with an expected checksum, or copy it into your query, cache key, or filename.

Features

Produces the standard 32-character lowercase digest, matching md5sum and PHP md5()
Case sensitive and whitespace exact, so results line up with command-line output
Optional salt or prefix support to reproduce salted MD5 schemes
Useful for legacy ETags, file de-duplication, and avatar style lookups
No installation and no upload, since hashing happens in your browser
Clearly explains where MD5 is still appropriate and where it is not

Frequently Asked Questions

For checksums and cache keys, yes. For passwords, signatures, or anything an attacker could manipulate, absolutely not. Practical collision attacks exist, so never use MD5 to prove that a file or message is authentic.
It is d41d8cd98f00b204e9800998ecf8427e. That constant appears often in databases and logs when a field was never populated, and it is worth recognising so you do not mistake it for a real value.
It is free, needs no sign-up, and hashing runs locally in your browser. The text you paste is never transmitted, which matters when you are checking a value that is a secret or an internal identifier.
Different algorithm, different digest. MD5 gives 32 hex characters from 128 bits and is broken for security use, while SHA-256 gives 64 hex characters from 256 bits and remains sound. For anything new, choose SHA-256.

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About MD5 Generator

MD5 turns any string into a 128-bit digest, written as 32 hexadecimal characters. It dates from 1992 and was the default fingerprint function for two decades, which is why it appears in legacy databases, old Gravatar-style avatar URLs, HTTP ETag headers, and file de-duplication scripts that nobody has rewritten yet.

It should not be used for anything security related. Collision attacks have been practical since 2004, and chosen-prefix collisions can be generated in seconds on a laptop. That means an attacker can craft two different files with the same MD5, so the digest cannot prove a file is the one you expected. Password storage is an even worse fit, because MD5 is fast enough to brute force at billions of attempts per second.

For non-adversarial purposes it is still perfectly serviceable. Detecting accidental file changes, generating a stable cache key from a string, and matching a legacy checksum all work fine, and this generator produces exactly the lowercase 32-character digest that PHP md5(), md5sum, and every other implementation returns, so your values will match.

When to Use This Tool

  • Reproducing a legacy MD5 checksum so an old system accepts your value
  • Looking up a Gravatar-style avatar address from an email hash
  • Checking whether a downloaded file has changed since you last saw it
  • Building a cache key or filename from a short string
  • Matching a hash stored in an existing database column