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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
JPG - Extension Details
Date Added: February 09, 2008
File Extension:  .JPG
Description 1: .JPG file extension is linked with JPEG [Joint Photographic Experts Group] Bitmap Image File Format. JPEG is the bitmap representation for images. A loss of compression reduces the image size and increasing compression allows higher quality images. JPEG is the best format for image files such as photos with significant number of colors that are used on emails or the internet. .JPG file extension is associated with PhotoOnWeb from VSOSoftware, Free PDF Converter from Baltsoft Software, IrfanView from Irfan Skiljan, NERO from Nero AG, ACDSee 10 Photo Manager from ACD Systems International Inc.
File Type:   Bitmap image file
Mode: Binary
Program(s) to Open:  Windows: ACDSee Photo Manager, Adobe Photoshop, Corel Paint Shop Pro, Microsoft Photo Editor; Mac: Adobe Photosho, Apple Preview, Nuance OmniPage Pro X, Roxio Toast; Unix: Th GNU Image Manipulation Program
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