File Types

There are hundreds of file types floating around on our computers. Let's figure out which ones do what and which programs will open them.
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AV1 logo
What Is an AVIF File?
A man saving a Pages document as a PDF in Pages on a MacBook Pro.
How to Make a PDF File
An illustration of typefaces
What is WOFF (Web Open Font Format)?
Person editing SVG files on a laptop
SVG Files: What They Are and How to Open & Convert Them
Person looking at an Android smartphone with an APK file on the screen
What Is an APK File?
GIF Files
What Is a GIF?
XVID files in Windows 10
What Is an XVID File?
A green zip file
What Are 'Zip' and 'WinZip'?
JPG Files
What Is a JPG (JPEG) File?
Screenshot of several PNG files in Windows 10
What Is a PNG File?
Row of red work files, with one yellow one
What Is a Computer File?
EPUB files in Windows 10
What Is an EPUB File?
What Is a CSV File?
Screenshot of several MOBI files in Windows 10
What Is a MOBI File?
Screenshot of several FLAC files in Windows 10
What Is a FLAC File?
What Is a RAR File?
EPS files in a folder in Windows 10
What Is an EPS File?
What Is an FLV File?
Screenshot of several empty DEB files on Ubuntu
What Is a DEB File?
INDD files in a folder in Windows 10
What Is an INDD File?
IPSW files in Windows 10
What Is an IPSW File?
Person sitting on a desk under three XML file icons holding an XML folder near a computer
What Is an XML File?
PSD files in Windows 10
What Is a PSD File?
ARW files in Windows 10 that open with Photos
What Is an ARW File?
7Z files in Windows 10
What Is a 7Z File?
Screenshot of several WMA files in Windows 10
What Is a WMA File?
several EXE files in Windows 11
What Is an EXE File?
Image of a person reading an ePub ebook
How to Convert PDF to ePub
Screenshot of several SWF files in Windows 10
What Is an SWF File?
Screenshot of several MKV files in Windows 10
What Is an MKV File?
DXF Files
What Is a DXF File?
Screenshot of several TIF files in Windows 10
What Are TIF and TIFF Files?
Several ISO files in Windows 10
What Is an ISO File?
SRT Files
What Is an SRT File?
Screenshot of several VOB files
What Is a VOB File?
Screenshot of several MPEG files in Windows 10
What Is an MPEG File?
Person looking at aspx files on a computer
What Is an ASPX File?
VCF files in Windows 11
What Is a VCF File?
AI Files
What Is an AI File?
Screenshot of several ODT files in Windows 10
What Is an ODT File?
RTF files
What Is an RTF File?
Screenshot of several M4A files in Windows 10
What Is an M4A File?
Screenshot of several files in a folder
What Is a File Extension?
What Is a 3GP File?
MD files
What Is an MD File?
What is an MP4 File? (and How to Open or Convert One)
Screenshot of several XVO files in Windows 10
What Is an XVO File?
DMG files in macOS High Sierra
What Is a DMG File?
Screenshot of several PAGES files in macOS High Sierra
What Is a PAGES File?
WAV Files
What Are WAV & WAVE Files?
Person managing CR2 files
What Is a CR2 File?
PHP files in Windows 10
What Is a PHP File?
M3U8 files that open in iTunes
What Is an M3U8 File?
ZIP files in Windows 11
What Is a ZIP File?
Illustration of a person looking at ACSM files on a computer monitor.
What Is an ACSM File? (And How to Open One)
PPTX files in a folder
What Is a PPTX File?
OGG files in Windows 10
What Is an OGG File?
WMV Files
What Is a WMV File?
KML files that open in Google Earth
What Is a KML File?