DROID is described as '(Digital Record and Object Identification) is a software tool developed by The National Archives to perform automated batch identification of file formats. Developed by its Digital Preservation Department as part of its broader digital preservation activities, DROID is' and is an app in the security & privacy category. There are seven alternatives to DROID for Windows, Linux, Web-based, Mac and BSD. The best DROID alternative is TrID. It's not free, so if you're looking for a free alternative, you could try TrID or TrIDNet. Other great apps like DROID are Toolsley File Identifier, FileCHK, HexBrowser and JHOVE.
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 TrIDScan(see at author site).
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.
file is a standard Unix program for recognizing the type of data contained in a computer file using magic numbers.
Identify files based on the libmagic database in your browser. HTML5/JS port of the "file" tool. No downloads, no installation and no uploads!.
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 of a file. It now recognizes more than 800 different file formats.
JHOVE is a file format identification, validation and characterisation tool. It is implemented as a Java application and is usable on any Unix, Windows, or OS X platform with appropriate Java installation.
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