There is a tendency to want a logo displayed as large as possible in marketing collateral. While it might be tempting to think the bigger the logo the bigger impression you’ll make, in fact the opposite is true.
Our minds are subconsciously conditioned to give more prestige and credibility to brands the smaller their logo is displayed. There are always exceptions, but almost all the best known brands display their logo quite small. If you want to add more emphasis to a logo (or any layout element for that matter) keep the logo smaller and add more white space (also called negative space) around it.
Take a look at almost any Fortune 100 company’s website to see this principle in action:
So, if you want your branding to communicate more prestige and credibility, quit trying so hard and tap into the subconscious consensus that smaller logos mean bigger brands.