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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
JFIF - Extension Details
Date Added: January 01, 1970
File Extension:  .JFIF
Description 1: .JFIF file extension is linked with JPEG File Interchange Format. This is the bitmap graphic which utilizes .JPEG compression. It is a variation of the typical JPEF format which is designed to use minimal data and allows JPEG bitstreams to be exchanged between applications and multi platforms. .JFIF format is seldom used and it has been outdated by enhancements to JPEG format.
File Type:   Bitmap Image File
Mode: Binary
Program(s) to Open:  Windows & Mac: any picture viewer or web browser
Common:
Extension: