MD5 Hash
Generate MD5 hash digests from text input
Input Text
MD5 Hash
About MD5
MD5 (Message-Digest Algorithm 5) produces a 128-bit hash value. While MD5 is no longer considered cryptographically secure for digital signatures, it is still commonly used for checksums and data integrity verification.
About this tool
MD5 produces a 128-bit fingerprint of any input, and it is genuinely fast - which is both why it spread everywhere and why it is now unsuitable for anything security-related. The break is specific and worth understanding: MD5 is vulnerable to collisions, meaning two different inputs can be deliberately constructed to produce the same hash. That was demonstrated in 2004 and is now trivial, which is why a matching MD5 no longer proves a file has not been substituted. What MD5 remains perfectly good at is detecting accidental change. A corrupted download, a truncated transfer, a bit flipped on a failing disk - all produce a completely different hash, and no attacker is involved. So the rule is simple: MD5 for integrity checks against accident, SHA-256 for anything where someone might be trying to deceive you, and BCrypt or Argon2 for passwords, never a fast hash. Note this processes on the server rather than in your browser.
How to use this tool
- Enter your textAny string. This is transmitted to the server for hashing, so use test data rather than secrets.
- Generate the hashYou get the standard 32-character hexadecimal MD5 digest.
- Compare against your expected valueCompare the whole string, not just the first and last few characters.
- Use a stronger algorithm if security mattersSHA-256 for tamper detection, BCrypt or Argon2 for passwords.
When MD5 is still fine - and when it is not
MD5 is still fine as a quick checksum to spot accidental corruption, to compare files you already trust, or as a cache key. It is not fine for passwords, digital signatures or anything an attacker could tamper with, because MD5 collisions can be produced on purpose.
For passwords use bcrypt or Argon2, and for integrity checks against tampering use SHA-256.
Key features
- Fast and universally supported, which is why legacy systems still use it.
- Produces the standard 32-character digest any other MD5 implementation will match.
- Fine for detecting accidental corruption, which remains a real use.
- No account and no limit.
- Useful for comparing whether two pieces of data are identical.
Common uses
- Checking a download against a publisher-supplied MD5 checksum.
- Detecting whether a file changed between two points in time.
- Working with a legacy system that expects MD5.
- Quickly comparing two strings for equality without storing them.
- Generating cache keys or deduplication fingerprints where security is irrelevant.
Tips for better results
- Use MD5 only where an attacker is not part of the threat model. For anything adversarial, SHA-256.
- Never hash passwords with MD5. Its speed is exactly what makes it wrong - use BCrypt or Argon2.
- Compare the full hash string. Checking only the ends is precisely what a constructed collision would exploit.
- For files rather than text, the File Checksum Generator handles large files by hashing in chunks.
- If a system still requires MD5 and you can influence it, that is usually worth raising - it signals other dated choices.
Mistakes to avoid
- Storing passwords as MD5 hashes, which is fast to crack and has been unacceptable for over a decade.
- Treating a matching MD5 as proof a file is authentic. Collisions can be deliberately constructed.
- Using MD5 for a security token or signature, where it provides no meaningful protection.
- Assuming MD5 is encryption. It is one-way - there is nothing to decrypt.
- Pasting sensitive data into this tool, since it is processed server-side rather than locally.
Frequently asked questions
Enter your text above and the 32-character hexadecimal digest is generated. Note that hashing happens on the server, so use test data rather than anything sensitive.
No, emphatically. MD5 is fast, which means an attacker with a stolen database can try billions of guesses per second. Password storage needs a deliberately slow algorithm - BCrypt or Argon2.
Detecting accidental change - a corrupted download, a truncated transfer, a failing disk. All of those produce a completely different hash, and no attacker is involved. That use remains entirely valid.
Because collisions can be deliberately constructed: two different files can be made to share one hash. That was first demonstrated in 2004 and is now cheap, so a matching MD5 cannot prove a file has not been substituted.
Not directly - it is one-way, and there is no key. But short or common inputs can be looked up in precomputed tables, which is a different attack and one reason MD5 is unsuitable for anything secret.
Yes, this tool hashes server-side. The input is not stored, but for that reason use test data rather than passwords or confidential strings.
This page hashes text. For a downloaded file, use the File Checksum Generator, which computes the MD5 of a file in your browser, then compare it with the checksum on the publisher's page - every character must match. Prefer a SHA-256 checksum when one is offered.
Usually because of invisible differences: a trailing newline, Windows line endings (CRLF) versus Unix (LF), or a different text encoding. Hash exactly the same bytes and the result will match.
Always 128 bits, written as 32 hexadecimal characters, whatever the size of the input - a single letter and a 4 GB file both produce a 32-character fingerprint.