File extension or filename suffix is usually three, four or more characters at the end of computer file names divided by a dot.
File extensions are useful to computer programs and operating systems like Windows or macOS (OS X), and basically telling them, what kind of data and file type they are working with and what associated program opens the file.
File-extensions.org library contains thousands of file extensions and the database is still growing.
A large number of file type entries have detailed descriptions, including their current use and the list of programs that can open, view, edit, convert or play unknown file you search for.
Latest articles
Check out the recently published articles related to file extensions, tutorials or software tips.
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Begin your search by entering the source and target file type specified by their file extensions. For example simply try flac to mp3.
File extension of the day
Random daily pick from File-Extensions.org's database.
.ncz - Netcad drawing file
For an overview of common file types,
visit the common file extensions page, which includes a list of the most important computer file formats you should know.
Popular file extensions
List of the most visited file extension records. Click on the link below for more details and software associations.
file extension apk - Google Android application package
file extension pdf - Adobe Portable document format
file extension rar - WinRAR RAR compressed archive
file extension mp4 - MPEG-4 video file format
file extension docx - Microsoft Word Open XML document
file extension jpg - JPEG bitmap image
file extension xlsx - Microsoft Excel Open XML workbook and spreadsheet
file extension epub - Open Publication structure e-book
file extension mp3 - Compressed audio and music file, mp3 songs or ringtones
file extension part - Partial download
file extension oxps - Microsoft OpenXPS document
file extension crypt12 - WhatsApp Messenger message database
file extension dwg - AutoCAD drawing
file extension dll - Dynamic Link Library
file extension numbers - Apple Numbers spreadsheet
Recently updated file extensions
The file extension database is maintained and improved on daily basis. Here you can check last updated entries.
file extension texture - Texture file
file extension obml - Opera Mini saved web page
file extension tst - ExamView test
file extension lbl - Database label file format
file extension dgn - MicroStation drawing
file extension whl - Python wheel package
file extension 23 - Creo Elements/Pro versioned data
file extension smc - Super Nintendo game-console ROM image
file extension cso - CISO compressed ISO image
file extension cdt - CorelDRAW template
file extension c3p - XPanel project
file extension dbk - Sony Ericsson mobile phone backup
file extension thmx - Microsoft Office theme
file extension ecu - TunerPro ECU configurator data
file extension swm - Windows Imaging Format split archive
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