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File Extensions

Browse file extensions by category or letter. Learn what each file type is used for and find software that can open, view, edit, or convert it.

3
Indexed file extensions
Popular searches:
.DOCX .7Z .AUTOCAD (DWG, DXF) .PDF .TXT .OBJ (.OBJ)

Find the right information for any file extension

Use this directory to look up file formats, understand what files are used for, and find compatible applications for Windows, macOS, Linux, mobile, and online tools.

Search by extension Enter extensions like PDF, APK, DAT, HEIC, ZIP, or DOCX.
Browse categories Filter by documents, images, videos, archives, data, and more.
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3 extensions
Executable Letter: P Clear all
.PKG

macOS Installer Package

A .pkg file is a package installer used on macOS. It's essentially an archive containing the files and instructions needed to install…

Executable
.PYO

Compiled Python File

A .pyo file is a compiled version of a Python source code file (.py). It's created when Python is run with the `-O` or `-OO` optimizat…

Executable
.PYZ

Python Zip Application

A .pyz file is a Python Zip Application, which is an archive containing Python code that can be executed directly. It's essentially a…

Executable
.PKG

macOS Installer Package

A .pkg file is a package installer used on macOS. It's essentially an archive containing the files and instructions needed to install software, fonts, drivers…

Executable
.PYO

Compiled Python File

A .pyo file is a compiled version of a Python source code file (.py). It's created when Python is run with the `-O` or `-OO` optimization flags. These flags in…

Executable
.PYZ

Python Zip Application

A .pyz file is a Python Zip Application, which is an archive containing Python code that can be executed directly. It's essentially a self-contained Python app…

Executable

Frequently Asked Questions

Everything you need to know about file extensions

You can search by entering a file extension directly in the search bar or browse the directory by category or alphabetical index.

Each listing provides a definition of the file extension, common use cases, compatible software, supported platforms, and related or alternative formats.

The database is updated regularly to reflect new file extensions, changes in software compatibility, and evolving file format standards.