File extensions

How many of these file extensions can you name?

A file extension is the part after the dot in a filename, such as .txt in README.txt

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Last updated: September 19, 2023

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Adobe
Extension	Description
AI	Adobe Illustrator artwork
PDF	Adobe's Portable Document Format
PSD	Photoshop native file format

Audio
Extension	Description
AIFF	Audio Interchange File Format
M3U8	MPEG Audio Layer 3 Uniform Resource Locator playlist, using UTF-8 encoding
M4A	MPEG-4 Part 14 audio
MID	Standard MIDI file
MP3	MPEG audio stream, layer 3
OGG	Vorbis audio in the Ogg container format
WAV	Sound format (Microsoft Windows RIFF WAVE)
XMF	eXtensible Music Format

Code
Extension	Description
BIN	Binary file
CSS	Cascading Style Sheet
HTML	Hypertext Markup Language
JAVA	Java source code file
JAR	Java archive
JS	JavaScript file
JSON	JavaScript Object Notation
PHP	PHP file
PY	Python script file
SQL	Structured Query Language
TS	TypeScript
XML	eXtensible Markup Language file

Image
Extension	Description
GIF	Compuserves' Graphics Interchange Format
JPG	Joint Photographic Group
PNG	Portable Network Graphics file
SPIFF	Still Picture Interchange File Format
SVG	Scalable Vector Graphics
THM	Thumbnail File
TIFF	Tag Image File Format image

Microsoft
Extension	Description
DOCX	Microsoft Word Document
PPTX	MS Office Open-XML Presentation
XLS	Microsoft Excel Spreadsheet

Other
Extension	Description
DAT	Data file
EXE	Directly executable program
RAR	Archive
TAR
ZIP
TMP	Temporary file
URL	Remote file shortcut

Text
Extension	Description
CSV	Comma Separated Values
MD	Markdown-formatted text file
TSV	Tab-separated values

Video
Extension	Description
M4V	MPEG-4 Part 14 video, which may optionally be encumbered by FairPlay DRM
MOV	Animation format (Mac)
MP4	multimedia container format, MPEG 4 Part 14
MPEG	multimedia container format
MXF	Material exchange format (RFC 4539, SMPTE 377M)
WEBM	Royalty-free video/audio container