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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
J2K - Extension Details
Date Added: January 01, 1970
File Extension:  .J2K
Description 1: .J2K file extension is linked with JPEG 2000 Image. It is the compressed bitmap image which utilizes wavelet compression instead of DCT compression that is normally used by standard JPEG image files. .J2K files may include alpha transparency, may be losslessly compressed, and it may also contain 16bit color.
File Type:   Bitmap Image File
Mode: Binary
Program(s) to Open:  Windows: Adobe Photoshop with JPEG 2000 plugin, Apple QuickTime 6.0 or later, Corel Paint Shop Pro, IvanView; Mac: Adobe Photoshop with JPEG 2000 plugin, Apple QuickTime 6.0 or later, GraphicConverter, ToyViewer
Common:
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