MD5 Hash Generator

Create MD5 hashes and checksums of text or files.

0 chars
MD5 · 128 bits

Result will appear here...

Free Online MD5 Hash Generator

Generate the MD5 hash of any text or file instantly. Type in the box and the 128-bit digest is recalculated on every keystroke; switch to File mode to fingerprint a download, an ISO image, or a backup archive. Everything runs in your browser — nothing is sent to a server.

What is MD5?

MD5 (Message-Digest Algorithm 5) was designed by Ron Rivest in 1991 and published as RFC 1321. It turns input of any length into a fixed 128-bit value, usually written as 32 hexadecimal characters. The same input always gives the same hash, and changing even one bit produces a completely different result. For example, hello hashes to 5d41402abc4b2a76b9719d911017c592.

Features of this MD5 generator

  • Text or file input – hash strings, hex bytes, Base64 data, or local files up to 200 MB.
  • Hash each line – generate one MD5 per line, handy for bulk lists of e-mails or IDs.
  • Output formats – lowercase hex, uppercase HEX, or Base64 (the format used by the Content-MD5 header and many cloud storage APIs).
  • Checksum verification – paste an expected MD5 and see immediately whether it matches.

When MD5 is still useful

Although MD5 is cryptographically broken, it remains everywhere: package mirrors publish MD5 checksums, databases use it to build short cache keys, ETags are often MD5-based, and many legacy systems store identifiers as MD5 strings. For these integrity and lookup tasks MD5 is fast and perfectly adequate.

When not to use MD5

Never use MD5 to protect passwords or to sign anything an attacker could tamper with. For integrity against attackers, use the SHA256 Hash Generator or SHA3-256. For passwords, use a slow algorithm such as bcrypt — see the WordPress Password Hash Generator. To sign messages with a secret key, use the HMAC Generator.

Frequently Asked Questions

No. MD5 is a one-way function, not encryption, so there is no key that turns the hash back into the input. Sites that claim to “decrypt” MD5 simply look the hash up in huge tables of previously hashed words, which only works for short or common inputs.

Not for security. Practical collision attacks have existed since 2004, so MD5 must not be used for digital signatures, certificates, or password storage. It is still fine for non-adversarial jobs such as detecting accidental file corruption, cache keys, or de-duplicating data.

The input bytes differ. Common causes are a trailing newline (echo adds one unless you use echo -n), Windows CRLF line endings, a different text encoding, or leading/trailing spaces. Switch the input type to Hex if you need to hash exact bytes.

Switch to File mode, drop the file in, and paste the published checksum into the “Compare with a known hash” box. A green match message means the file is identical to the original. The file is read locally and never uploaded.