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MD5 Hash Checker

Paste the expected MD5 hash, then choose the file or type the text, and see at once whether it matches. Large files are streamed in slices with progress, entirely on your device. MD5 is fine for spotting a corrupted download, but it is broken for security: a deliberate attacker can produce different files with the same MD5, so the page tells you when to use SHA-256 instead.

  • Runs in your browser
  • No sign-up
  • Free to use
MD5 is not suitable for security. Collisions can be created on purpose, so a matching MD5 does not prove a file was not tampered with. Use it only to detect accidental corruption, and prefer SHA-256 where a publisher offers it.

How to use MD5 Hash Checker

  1. Paste the expected MD5 hash.
  2. Choose the file, or type the text.
  3. Read the result: match or mismatch.
  4. For security-relevant checks, use the SHA-256 hash if one is published.

MD5 Hash Checker features

Match or mismatch

Clear verdict against the expected hash.

Large files

Streamed in 4 MB slices with progress.

Flexible input

Accepts hex in any case and Base64.

Text too

UTF-8 text exactly as entered.

Honest warning

Explains the limits of MD5.

Private

Nothing is uploaded.

When to use MD5 Hash Checker

  • Checking that a download from an older mirror is complete.
  • Verifying files copied between disks or servers.
  • Comparing against an MD5 listed by a legacy system.
  • Confirming an upload arrived unchanged in storage that reports MD5 (ETag).

MD5 Hash Checker FAQ

Is MD5 secure?

No. Since 2004 practical collisions have been demonstrated, and attackers can craft two different files with the same MD5. It must not be used to prove a file is authentic or for passwords.

Then why check MD5 at all?

For detecting accidental damage, such as a truncated download or a disk error, MD5 still works: random corruption almost never preserves the hash. Many older systems publish only MD5.

What should I use instead?

SHA-256 for file integrity, with the hash obtained from a trusted source. For authenticity, a digital signature.

Is my file uploaded?

No. It is hashed in your browser.

Why do I get a mismatch for text?

Check line endings and trailing spaces or newlines. The tool hashes the UTF-8 bytes exactly as entered.

What does an MD5 look like?

32 hexadecimal characters, for example 9e107d9d372bb6826bd81d3542a419d6.

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A checksum from another era

MD5 was designed in 1991 and for years was the standard way to fingerprint files. It produces a 128-bit hash, written as 32 hexadecimal characters, and it is fast. Many download pages, package archives and storage systems still report MD5 values, so checking against them remains a practical need.

Its security failed in stages. Researchers found weaknesses in the 1990s, demonstrated real collisions in 2004, and later showed how to create chosen-prefix collisions: two meaningful but different files with the same hash. Attackers have used this to forge certificates. MD5 therefore says nothing about whether a file is authentic.

What MD5 can still do is detect accidents. When a download is cut short or a disk flips a bit, the resulting MD5 changes. For that purpose, comparing MD5 values remains reliable, and it is what this tool does.

For anything that matters for security, rely on SHA-256 or stronger, and on the trustworthiness of where the expected hash came from. Better still, verify a digital signature from the publisher, which proves both integrity and origin.

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