Make sure each object you want to export is in separate artboards. Then select all the objects. Go to File -> Export Selection. Got to 'Artboards' tab, Tick off the 'Include Bleed' box under the artboard range. Set the artboard range and choose your desired format. Then click 'Export Artboard'. Done! Now every images that you exported will be as the same as the artboard sizes you set.

Hope this tip helps! Enjoy.. Cheers! Arun

1. Make sure each object you want to export is in separate artboards.
2. Select all the objects.
3. Go to File -> Export Selection.
4. Go to 'Artboards' tab, Tick off the 'Include Bleed' box under the artboard range.
5. Set the artboard range and choose your desired format.
6. Click 'Export Artboard'.

Done! Now every images that you exported will be as the same as the artboard sizes you set.