Design Within the Limits of Space As you may have noticed, favicons are pretty small. Most favicons are 16px in size, as browsers universally accept this size and dimension. Although, favicons can be made bigger in certain use cases.
Keep it Simple Since favicons are so small, it is ideal to keep the design simple. This means avoiding designs that have too many elements and colors to them. The trick to making a favicon is to stick with shapes, letters, and colors that are visually appealing and stand out on the internet.
Establish a Brand Image We all recognize the famous favicons of tech giants like Facebook, Twitter, and Google. Such is the power of their favicons that most of us remember these tech companies by this visual image. Therefore, you must design a favicon that leaves an impression. Something that instantly tells the user what your brand is all about. It can be hard to achieve such a massive directive in a minuscule image, but take it as an opportunity to unleash your creativity.
Abbreviations A common way to design favicons is to use abbreviations. You can create short and catchy abbreviations of your brand name and add it to your favicon. You can play around with letters and designs to figure out what works best for you. Famous examples include Facebook and Wikipedia, both use the first letter of their brand as a visual favicon representation of their website.
Choose Colors Wisely With limited space and design options, colors become a crucial factor. You need to choose colors that are visually pleasing and also uniquely represent the theme of your brand. Use color theory to your advantage. Contrasting colors work well and help the human eye to remember shapes and elements.