File Extension Wiki
What popular file extensions mean, how to open them, and how to convert locally (no uploads).
Browse extensions
Pick a file extension to learn what it is, how to open it, and common local-only conversions.
.AI
Adobe Illustrator Artwork
Design / Vector Image
.AVIF
AV1 Image File Format
Image
.DAT
Generic Data File
System / Data
.DWG
AutoCAD Drawing Database
CAD / Vector Image
.HEIC
High Efficiency Image Container
Image
.HEVC
High Efficiency Video Coding
Video
.MKV
Matroska Video Container
Video
.MOV
QuickTime File Format
Video
.PDF
Portable Document Format
Document
.PSD
Adobe Photoshop Document
Design / Image
.SVG
Scalable Vector Graphics
Vector Image
.WEBP
WebP
Image