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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.

5
Indexed file extensions

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.
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5 extensions
Video Letter: A Clear all
.AAF

Advanced Authoring Format

The Advanced Authoring Format (AAF) is a professional-level, cross-platform file format designed for the interchange of digital media…

Video
.AEP

Adobe After Effects Project File

An AEP file stands for Adobe After Effects Project file. It is the native project file format used by Adobe After Effects, a professio…

Video
.ASF

Advanced Systems Format

The Advanced Systems Format (ASF), formerly known as Active Streaming Format or Advanced Streaming Format, is Microsoft's proprietary…

Video
.ASS

Advanced SubStation Alpha

The .ass file extension represents a subtitle file format known as Advanced SubStation Alpha. It's a text-based format used to store s…

Video
.AVI

Audio Video Interleave

AVI (Audio Video Interleave) is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Window…

Video

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.