TrID

Allows to detect file type by recognition of binary signatures. Database with signatures can be downloaded from author site or trained by user with program named...

Free Personal Windows Linux Web

TrIDNet

TRIDNet is the GUI version of TrID, probably more practical to use than the CLI version, especially for those not very familiar with the command line prompt.

Free Windows

file

file is a standard Unix program for recognizing the type of data contained in a computer file using magic numbers.

Free Open Source Mac OS X Linux BSD

FileCHK

Identify and recover (as much as possible) data lost in CHK files.

Free Open Source Windows

HexBrowser

HexBrowser is a tool that identifies file types. It does not care about the file extension, but opens each file to look for signatures so it can determine the exact type...

Free Windows