Make a banner with AI

A banner differs from any other picture in one way: it has an exact size, and it's not up for debate. 728 × 90 for a leaderboard above the content, 1200 × 500 for a website slider, 300 × 250 for a rectangle in the sidebar. Miss by ten pixels and the banner won't upload, or it gets cropped so the button disappears.

So here a banner is built as a layout, not as a generated picture. The canvas is set to exactly the pixels you need, the network draws the background or the product, and the headline, price and button are set as real text on top — no typos, and every line can be moved or replaced without redrawing the image.

What to write so the banner works first time

1. The exact size in pixels — "1200 × 500", not "wide". If you need several sizes, list them all at once.
2. Where it will go — a website, an ad network, a social media page, a newsletter.
3. The text word for word — headline, subheading, button text. The shorter the better: banners are read on the move.
4. What's in the picture — your product (upload a photo), a person, a scene. Or just colour and typography.
5. Brand colours and logo, if you have them.

How to describe the picture itself so it sells rather than just looks nice is covered in the chapter on ad creatives.

Describe the banner and its size — the designer will put it together right here.

Banner sizes for Google Ads

Uploaded image ads in Google Ads are accepted only at fixed sizes. According to Google's specifications as of 19 September 2026, these are:

Set the canvas to the slot size. The banner exports at double pixel density, so a 300 × 250 canvas gives a 600 × 500 file — sharp on high-density screens, but not one of the sizes above. Before uploading, scale the file back to 300 × 250 in any image editor.

Banners for websites and social media

Websites have no single standard: the banner size is set by your template. Ask your developer or check the size of the current banner — and name it in your request. The same goes for a social media cover: take the size from the platform's own help page and name it.

One idea — every size

An ad campaign rarely makes do with one format. Once the first banner is approved, the rest are assembled from the same layers: "now the same in 300 × 600 and 728 × 90". The images aren't generated again — the layout changes, and the product stays the same product at every size.

Every variant is rendered in a browser and checked before you see it: is the text clipped, is there enough contrast, has the button run into the edge. On a narrow 728 × 90 strip this is especially useful — that's where the headline most often doesn't fit.

The same approach works for posters and business cards.

In the Twelver chat a banner is built at exactly the pixels you need: the image from the network, the text in a real font, every campaign size from the same layers. Back to the image generation guide.