Is it safe to blend seeded grapes without removing seeds? It's doubtless unproductive and wearisome to remove seeds from each seeded grape before placing each into a blender. But if I don't remove seeds, can the seeds:


mangle or mar the blender blades? 
chip or shatter the blender's container/jar?
In short, no. You could blend pencils and pens with most modern blenders and there's no damage to the blender. Fruit seeds won't be a consideration except in use of the blended fruit. You might need to strain the output to remove bits of hull.