Is my logo that I made with Adobe Illustrator already a vector file when saved as .ai?
I have designed a logo in Adobe CS5.1 Illustrator using the ellipse tool to create shapes, filled with colour and then added my type.
The file is saved as
Is it automatically a vector image?
If you haven't used any special effects, you should be good, but as Scott said, all special effects will Flatten to Raster (pixels).
The Flattening settings will also effect what gets Rasterized on export.
If you're not sure, use the Flattening Preview.
You can manually Flatten an object be selecting it and going to Object / Flatten Transparency
- Note the extra box on the bottom example. The Drop Shadow will be rastor inside that shape. Illustrator is basically 'boxing-out' the shadow, which will be made of pixels, not Vector art.
You can also switch to Outline View (Command + Y).
Anything you can see in Outline View will be Vector. Any object that is just a box, or not displayed (like Effects) is not Vector.