I am attempting to paste my logo in the interface window. This is the logo that appears on letters and mail. I have a professional file however if I copy and paste it. It looses it's resolution. Any ideas as to what format I should use. I have tried Jpeg. Tiff. and PDF.

I like .png myself.

Note that on the admin screen where you paste it we're reducing the image so you can see the whole thing; this "reduction" is done by FileMaker itself and can be kind of rough. So if you have a big image you might try reducing it to size in PhotoShop and then pasting it in.

What is the proper/best size for logo?