What is AI? AI, short name for Adobe Illustrator, is used as the file extension for Adobe Illustrator files. .AI files are binary files that can be opened by Adobe Illustrator software. See the sample .AI file included below.

File Extension: .AI

MIME Type: application/octet-stream

File Content: Adobe Illustrator

.AI files are Adobe Illustrator files saved as binary files. Here are the first 128 bytes of a sample .AI file dumped in HEX values:

25 50 44 46 2d 31 2e 35 0d 25 e2 e3 cf d3 0d 0a .PDF.1.5........
31 20 30 20 6f 62 6a 0d 3c 3c 2f 4d 65 74 61 64 1.0.obj....Metad
61 74 61 20 32 20 30 20 52 2f 50 61 67 65 73 20 ata.2.0.R.Pages.
33 20 30 20 52 2f 54 79 70 65 2f 43 61 74 61 6c 3.0.R.Type.Catal
6f 67 3e 3e 0d 65 6e 64 6f 62 6a 0d 32 20 30 20 og...endobj.2.0.
6f 62 6a 0d 3c 3c 2f 4c 65 6e 67 74 68 20 34 36 obj....Length.46
33 37 37 2f 53 75 62 74 79 70 65 2f 58 4d 4c 2f 377.Subtype.XML.
54 79 70 65 2f 4d 65 74 61 64 61 74 61 3e 3e 73 Type.Metadata..s

Note that .AI files shares the same file identifier "PDF" as .PDF files.

.AI Adobe Illustrator file sample: Click sample.ai to download.

.AI Adobe Illustrator files can be created and modified by these software:

• Adobe Illustrator - Creates and edits .AI files.