We are going to upload a document from HTML input & we can find the magic number of that file & from that number we can find the file type of that file.

Magic Number:

• A magic number is a number embedded at or near the beginning of a file that indicates its file format (i.e. the type of file it is).
• This number is not visible to us.
• Every file has a number that represents the name of file types which is hexadecimal format.
• In our program, we will convert it into bytes and an array for checking file type.

Chart for the magic number

Note: Refer chart source for file types Wikipedia.

1. Known Mime Types

2. Common MIME Type 

Digital Investigation Site for Magic Numbers - https://asecuritysite.com/forensics/magic

Validate File Extension Demo