Check MD5 and SHA1 Hashes to Verify File Integrity

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What Is an MD5 Hash?

MD5 (short for Message-Digest algorithm 5) is a widely used cryptographic hash function that produces a 128-bit value. An MD5 hash is usually represented as a 32-character hexadecimal number.
MD5 has been used in many security applications and is also commonly used to check file integrity. So MD5 can be understood simply as a code used to check the accuracy and integrity of a file when it is transferred over the Internet or copied somewhere; every file has its own MD5 hash.

Why You Should Check the MD5

While a file is downloading, the connection may be interrupted or your hard drive may have a problem. If the file ends up corrupted, even in a small part, it will cause errors when you use it, especially Ghost files.
For small files, there is no need to provide an MD5 hash because they can be downloaded again quickly. But for large files, from several GB to tens of GB, the uploader usually provides an MD5 hash so that people who download the file can check whether it differs from the file the uploader uploaded. Even if the file size and file name check out, if the MD5 hash is wrong, you will have to download the file again until the hashes match, or ask the uploader to check the MD5 hash of the original file.

How to Check MD5 and SHA1 with HashCalc

Step 1:

First, download HashCalc below, then open it

Step 2: 

To check the MD5 or SHA1 of a file, in the Data Format field, choose File.
In the Data field, click the three-dot button circled in red and select the file you want to check the MD5 or SHA1.
 

Step 3

Then choose which hashes to check the file with. I need to check MD5 and SHA1, then click Calculate to check the MD5 and SHA1
After checking the MD5 and SHA1 hashes, compare them with the hashes from the person who shared the file. If they match, the downloaded file is complete. Otherwise, if the hashes don’t match, the downloaded file has errors and you will have to download it again.