AI banner generator for LinkedIn: a 1584×396 cover image

To make a LinkedIn banner with AI, generate a 4:1 image and resize it to 1584 × 396 pixels, the size LinkedIn recommends for the cover image on your profile (JPG or PNG, under 8MB). On Sume, google/nano-banana-2 is the only catalog model that lists a native 4:1 ratio; ChatGPT Image's documented custom sizes stop at 3:1, so they cannot hold the strip.

LinkedIn's numbers are quoted from two LinkedIn Help pages, the profile cover image and Page image specifications, which can change. Sume facts come from the Image API docs and the model catalog. All were read on 2026-09-27.

What size is a LinkedIn banner?

LinkedIn's Help calls the profile banner the cover image, though some of its steps still say background photo. It appears behind your profile photo, and how it looks changes with the browser window size and screen resolution. Company Pages have their own cover image with a different size:

How do I generate a LinkedIn banner with Sume?

Ask POST /v1/images for a 4:1 image from Nano Banana 2, then resize the file to the exact size in your own editor. The request below asks for the 2K tier.

• The resolution tiers are 512, 1K, 2K, and 4K; in current code, 1K applies when you omit the field. Check that the file is at least 1584 pixels wide; if it is not, ask for a higher tier.
• In current code the tier changes Nano Banana 2's price, and the catalog line shows the 1K rate, so read usage.cost in the response for the amount billed.
• Results come back as Sume-hosted, signed URLs. Save the file, resize it to 1584 × 396, and export it as PNG or JPEG under LinkedIn's 8MB limit.

curl -X POST "https://api.sume.com/v1/images" \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/nano-banana-2",
    "prompt": "LinkedIn cover image for a data engineer: an abstract pattern of soft blue network lines on a dark gradient, calm and uncluttered",
    "aspect_ratio": "4:1",
    "resolution": "2K",
    "output_format": "png"
  }'

Why not ask for 1584 × 396 directly?

On ChatGPT Image, 1584 × 396 breaks three of the four custom-size rules: 396 is not a multiple of 16, 4:1 is wider than the 3:1 limit, and 627,264 pixels is under the 655,360 minimum.

Nano Banana takes no custom pixels: a pixel size maps to the nearest listed ratio, 4:1 on Nano Banana 2 and 21:9 on Nano Banana Pro, which has no 4:1. In current code the requested pixels are only recorded on the job, and the file is not resized. Seedream, Flux, Qwen, and Recraft also take custom pixels, but the docs publish no size rules for them, so an exact 1584 × 396 file from them is not a documented result.

How do I make a LinkedIn company Page cover?

The Page cover image is 1512 × 256 pixels, about 5.9 times as wide as it is tall, which falls between the 4:1 and 8:1 ratios Nano Banana 2 lists. Generate at 8:1 and crop the sides, or at 4:1 and crop the top and bottom, then resize to 1512 × 256.

LinkedIn says the Page cover might be trimmed horizontally or vertically to fit the screen, so keep key details away from the edges, especially the lower-right corner, and put important information in the center.

What does LinkedIn recommend for the image itself?

• LinkedIn's Help suggests photos rather than images with logos for a cover image.
• If the cover looks blurry or pixelated, LinkedIn suggests choosing an image with a larger file size.
• Your profile photo sits in front of the cover image, so keep text and faces clear of it. After upload, LinkedIn's editor lets you crop the image and change its position and size.