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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
JPEG - Extension Details
Date Added: January 01, 1970
File Extension:  .JPEG
Description 1: .JPEG file extension is linked with JPEG Image File. It is the compressed graphic file format which has been standardized by JPEG or Joint Photographic Experts Group. It supports up to 24bit color which makes it an ideal format for storing digital photographs. .JPEG file utilizes lossy compression which entails loss of image quality once applied with compression; the more compression, the lesser the image quality.
File Type:   Bitmap Image File
Mode: Binary
Program(s) to Open:  Windows: ACDSee Photo Manger, any web browser, any picture viewer program, Microsoft Photo Editor, Nuance OmniPage Professional; Mac: any web browser, any picture viewer program, Apple Preview, Nuance OmniPage Pro X, Roxio Toast; Unix: GIMP [The GNU Image Manipulation Program]
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