Not sure what an AI file is or how to open one? We explain why designers use this format, where it comes from, and the best ...

This free PDF editor is full of pro-level editing tools and an "AI co-pilot" that streamlines your workflow.

Adobe's PDF viewer faces some stiff competition from more comprehensive tools, like the AI PDF editor from PDFgear, which has more than 30 features and multi-platform support—for free.