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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
GIF - Extension Details
Date Added: February 09, 2008
File Extension:  .GIF
Description 1: .GIF file extension is linked with Graphics Interchange File Format a standard bitmap graphics file format developed by CompuServ during the late 1980's that is used by the World Wide Web. GIF supports 256 color levels. .GIF file extension is also associated with other applications such as PhotoOnWeb from VSOSoftware, Free PDF Converter from Baltsoft Software, Adobe Creative Suite & Adobe Photoshop from Adobe Systems Incorporated, IrfanView from Irfan Skiljkan, Zoner GIF Animator from ZONER Inc.
File Type:   Bitmap image file
Mode: Binary
Program(s) to Open:  Windows: ACDSee Photo Manager, Adobe Photoshop, Adobe Photoshop Elements, Microsoft Windows Photo Gallery Viewer, Nuance OmniPage Professional; Mac: Adobe Photoshop, Adobe Photoshop Elements for Mac, Apple Preveiw or Safari, Nuance OniPage Pro X, Other Picture Viewer or Web Browser; Unix: The GIMP
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