What size should my logo be for my website?
In general, website logos can be any size, however the recommended logo dimensions for a web page are 250 x 150 px. Remember that your logo will not take up the entire width of a website, banner or layout, rather it should be included in the overall design.
What size should my logo file be?
Keeping your email signature logo file size as small as possible is ideal for emails. Make sure your file is under 30 KB, but aim for under 10 KB.