What makes banner ads a special case
Banner ads and other display units are small, usually surrounded by other content, and often seen by people who were not looking for them. They come in many sizes, from wide strips to tall sidebars to small squares, and the available sizes and rules vary by network and over time. Whatever the format, the space is tight and the viewer’s patience is short.
That combination makes banner ads a good lesson in restraint. The designer cannot rely on long copy, detailed imagery or subtle moods. The ad has to be understood almost at a glance, and what it asks of the viewer has to be obvious.
Start with one message
The most common problem in small ads is trying to say too much. A banner might attempt to introduce a company, list three features, announce a discount and show a product, all within a few hundred pixels. The result is usually clutter, and a viewer who is not looking for the ad will not work to decode it.
Before opening any design tool, write the single sentence the ad should leave in someone’s mind. Examples of the kind of thing this means, purely hypothetical: “this event is on Saturday” or “this tool is free to try.” Everything in the design should support that sentence, and anything that does not should be removed or demoted.
Having one message also helps when you need several sizes. A clear message can be rearranged into a wide strip or a tall unit, while a crowded one has to be redesigned from scratch each time.
Build a clear hierarchy
With the message chosen, rank the elements. Most banners need only a handful:
- A headline or key visual that carries the message.
- A supporting line or image, if truly needed.
- A brand mark, so viewers know who is speaking.
- A call to action, so viewers know what to do next.
The principle of visual hierarchy means these should not all compete at the same volume. Make the most important element the largest or most contrasted, make the next one clearly smaller, and let the rest recede. The viewer’s eye should travel through the ad in a predictable order. Techniques such as scale, placement and visual contrast do most of the work.
Reading patterns matter as well. In left-to-right languages, people often begin at the top left and move across and down, though a strong image or high-contrast shape can override this. In a wide, short banner, a left-to-right sequence of image, headline and button is a natural arrangement. In a tall unit, a top-to-bottom sequence plays the same role.
Keep the text short and readable
In small formats, every word costs space. Some guidelines that tend to hold:
- Keep the headline to a few words, if you can.
- Use a clear, sturdy type style at a size that stays readable when the ad is displayed small. Avoid thin or decorative styles for key text.
- Leave enough line spacing and margin that text does not feel jammed against the edge.
- Avoid more than two type sizes or styles in a small ad.
Color contrast is critical. Light gray on white or text over a busy photograph may look elegant on a large monitor but vanish on a crowded page. Check that headline and button text stand out clearly from their backgrounds.
Use imagery with purpose
A single strong image usually works better than several small ones. Whether it is a photograph, an illustration or a simple graphic shape, it should support the message and have a clear focal point. Cropping tightly on the subject can help a small image read more quickly. Busy backgrounds make text harder to read, so consider a plain or softly treated area where the words will sit.
Leave some white space. It can feel wasteful to leave part of a small ad empty, but the empty area helps the important parts stand out. An ad that is full edge to edge tends to look like noise.
Make the next step obvious
Most banner ads exist to prompt some action, such as clicking, visiting or signing up. A clearly designed call to action, often a button-like shape with a short verb phrase, tells the viewer what happens next. It should be distinct from the rest of the ad without being so loud that it overwhelms the message. Another article in this cluster looks at buttons and emphasis in more detail.
Consistency and brand recognition
An ad does not need to carry the full weight of a brand, but it should look like it belongs to it. Using the same brand colors, a recognizable logo placement and a consistent type style helps viewers connect the ad to the source, even when they have seen it only briefly. A short brand style guide, or at least a short list of agreed colors and type choices, keeps a set of ads from looking like they came from different companies.
If an ad campaign includes multiple sizes, keep the logo, color scheme and main message consistent while adjusting layout to fit each shape.
Common mistakes
- Packing in several messages, so none stands out.
- Using text that is too small or too low in contrast.
- Making every element the same size and weight.
- Using an image that does not relate to the message.
- Leaving out a clear next step, or making the button hard to find.
- Using a design that looks the same as the surrounding content and so goes unnoticed.
- Using misleading claims or images. Honest ads are better practice, and misleading graphics can also cause trouble with platforms and with viewers.
A quick review before running an ad
Squint at the design, or view it at actual size. Can you tell what it is for within a moment? Is the brand identifiable? Is it clear what to do next? If not, remove something. Results from any ad depend on audience, placement and offer as much as on design, so treat design as one of several factors and test alternatives where you can.