Adobe PDF files (Portable Document Files) are generally used to share high-resolution documents containing both text and images. Unlike other document file formats, like Microsoft Word documents, PDFs maintain their original fonts, colors and spacing, so everyone viewing the document sees the same thing no matter what monitor size or computer platform is being used. AI files are Adobe Illustrator files; Illustrator is used to create and edit high-resolution vector graphics. While Illustrator is not designed to be a PDF editor, it is possible to convert PDF files into AI files.
Launch Adobe Illustrator.
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Go to "File," then "Open" and select the PDF file you wish to convert to an AI file.
Once open, go to "File," then "Save As" and change the file type to an AI file.