A key visual is the single lead image or layout that carries a campaign idea and is recognised wherever it appears. It is not one finished poster. It is a system: a main image, a headline, a logo and a call to action arranged so they can be rebuilt for a wide banner, a square post and a tall story without losing the idea.
The anatomy of a key visual
Most key visuals contain the same five parts. Naming them helps a team agree what is fixed and what can move.
- Hero subject. One person, product or scene that carries the idea. If it needs explaining, it is doing too much.
- Headline or line. Short enough to stay legible when the layout shrinks.
- Brand mark. Logo placement with clear space rules from your visual identity.
- Call to action. Often separate from the main image so it can be edited per channel.
- Background and colour field. The part most likely to be extended, cropped or simplified.
The idea itself should come first. A key visual executes one proposition, which is the subject of building a campaign around one strong creative idea.
Design for the weakest format first
Pick the most restrictive format and test the idea there. If the line and the subject work in a tall, narrow frame, a wider frame usually gives you more room, not less.
Plan three zones in every frame:
- Core zone: subject, headline and logo. Nothing essential sits outside it.
- Flex zone: background and supporting graphics that can be extended or cropped.
- Edge margin: space the platform or printer may cover, trim or overlay, such as interface buttons on vertical placements.
Platforms publish their own guidance, and it varies. Google Ads, for example, lists 1.91:1 landscape and 1:1 square image assets as the standard responsive display sizes, with 1200 by 628 pixels recommended for landscape (Google Ads Help). Check each platform’s current help page rather than relying on a remembered figure.
A practical adaptation table
| Format | What to keep | What to flex |
|---|---|---|
| Landscape banner | Subject on one side, headline on the other | Background extension |
| Square post | Subject and headline stacked | Tighter crop, smaller logo |
| Vertical story or reel | Subject in the middle band | Top and bottom background, CTA moved inside the safe area |
| Print or out of home | High resolution subject, shorter line | Bleed and trim margins |
Build in layers
Deliver the key visual as separate layers: subject cut out, background, text, logo, CTA. A flattened image is hard to adapt and forces redesign for each size. Layered files let one designer produce a dozen formats consistently, which is the practical heart of repurposing one campaign.
Test before you scale
Shrink the layout to thumbnail size and squint. Can you still tell what the campaign is about and who it is from? Then view it in greyscale and on a phone in daylight. If it fails any of these, simplify.
Honest representation
If the key visual shows a product, it must look like the product. The ACCC says images and descriptions must be accurate, and that the overall impression counts even if each statement is technically true (ACCC). Retouching and generated backgrounds are fine; changing what the product is or does is not. This is general information, not legal advice.
Common mistakes
- Putting the logo or line right at the edge of the frame.
- Using a hero image that only works in landscape.
- Adding so many messages that nothing leads.
- Approving only the master and discovering the problem at the smallest size.
- Forgetting a plain version for situations where the image cannot load.
Where Radiance Impact fits
Radiance Impact’s Studio designs campaign imagery, animation and character design, and its Growth division plans how campaigns run across channels. To talk through a campaign, visit /contact or see the Studio page.
Sources
- Image asset requirements for responsive display ads, Google Ads Help
- False or misleading claims, ACCC
