A lot of logos on the web look like they were run over by a truck. Blurry, jagged, hideous. Here's how to make your resized logos gorgeous and sharp.
The first point is to always save your graphics and logos as either a GIF or a PNG. Saving solid colour graphics and logos as a jpeg is a catastrophe and inevitably results in nasty digital noise. This sound elementary but I have had three trained graphic designers do this wrong, including a graduate of the Art Institute of California. The only one who knew the right answer (in what format to save a text logo) was our lead programmer, Peter.
For an example, one doesn't have to go further than the website of Royal Bank of Canada.
RBC logo: jpeg text buzz in action
Even billions of dollars won't save you from jpeg text buzz on your logos. Here are the jpeg jaggies in closeup: