AI is Adobe Illustrator's native vector format — it stores shapes, paths, and artwork as mathematical definitions that scale from a business card to a billboard without losing clarity.
Safe format
Type Image
By Adobe
MIMEapplication/illustrator
Drop any file to identify it
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AI is Adobe Illustrator's native vector format — it stores shapes, paths, and artwork as mathematical definitions that scale from a business card to a billboard without losing clarity. Illustrator's vector kingdom, and you are not on the guest list. A designer sends you an .ai file and your computer shrugs. Logos, icons, illustrations, print layouts: this is the format professionals build in. The twist is that most AI files are secretly PDFs under the hood. Adobe embeds a PDF-compatible preview by default, which means renaming the extension to .pdf sometimes works. Sometimes. For real editing, you need Illustrator, Affinity Designer, or a generous friend with a subscription.
Technical details
Full Name
Adobe Illustrator Artwork
MIME Type
application/illustrator
Developer
Adobe
Magic Bytes
25 50 44 46
Safety
.ai is a known, safe format.
What opens it
Adobe Illustrator
SubscriptionAll
Affinity Designer
$70All
Inkscape
FREEAll
* Limited compatibility
FAQ
How do I open an AI file without Illustrator?
Affinity Designer ($70 one-time) is the best non-Adobe option. Inkscape (free) can handle simpler files. Many AI files are actually PDFs internally — try renaming to .pdf and opening in a PDF reader.
What is the difference between AI and SVG?
Both are vector formats, but SVG is an open web standard that browsers render natively, while AI is Adobe's proprietary format with richer editing features (multiple artboards, effects, linked assets). Use SVG for the web, AI for professional print and design work.
What is the difference between AI and EPS?
AI is Illustrator's native format and preserves every feature — layers, artboards, effects, editable text. EPS is an older interchange format that flattens most of that away. AI is for working files; EPS is for handing off to systems that just need the artwork.
What are alternatives to Adobe Illustrator for opening AI files?
Affinity Designer ($70 one-time) has the best AI compatibility outside Adobe. Inkscape (free) opens simpler files. CorelDRAW handles AI import. For quick viewing, rename .ai to .pdf — most AI files embed a PDF preview that any PDF reader can display.