ImageAd creativesIntermediateGenerates an image

Vertical Story and Reel ad background (9:16)

A 9:16 background built around the zones that app interfaces cover, with the subject placed between the top and bottom UI bands.

For: Performance marketers, Creative strategists, E-commerce marketers · Works with: OpenAI GPT Image, Google Gemini image generation (Nano Banana), FLUX (Black Forest Labs), Any image generator

Your prompt

Create a 9:16 vertical image to be used as the background of a Story or Reel ad for a budgeting app for freelancers (personal finance app). Subject: a smartphone floating at a slight angle, its screen glowing softly, surrounded by a few abstract coin shapes, placed in the central vertical band of the frame. Safe zones: keep the top 14% and the bottom 20% of the frame visually simple (soft gradient or plain surface) because platform interface elements will cover them. Do not place the subject or any important detail in those bands. Look: clean 3D render with soft shadows and subtle depth, high contrast between subject and background so it holds attention in a fast scroll, one clear focal point. Colour: dominant palette of deep navy, mint green and white. Constraints: no text, no logos, no watermarks, no frames or borders.

Customize

The fields start with example values so you can see how the prompt works. Everything stays in your browser.

What is being advertised.

A short category label for context.

What appears in the central band.

The rendering style.

Dominant colours.

Example of what to expect

Illustrative only. It describes the kind of result this prompt aims for; real output varies by tool, model and run.

A tall image with a glowing phone and abstract coins in the middle, a plain navy gradient above and below, leaving the platform UI bands uncluttered.

Expected format: One 9:16 image, ideally 1080x1920 or larger.

How to use it

  1. Generate at the largest 9:16 size your tool allows.
  2. Overlay text and the CTA in a video or design editor, inside the safe area.
  3. Confirm placement-specific safe zones with a checker before exporting.

Limitations

  • Models do not reliably obey percentage-based layout instructions; verify the empty bands visually and crop or extend if needed.
  • Safe-zone dimensions change when platforms update their interfaces; treat the percentages as a starting point.

Platform notes

OpenAI GPT Image

Official docs read · checked 2026-10-11

Aspect ratio is set with the size parameter, not in prose. Use medium or high quality when the image contains text or fine detail. Use a 9:16-proportioned size.

General notes on OpenAI GPT Image
  • OpenAI's guide covers gpt-image-2 (recommended), gpt-image-1.5, gpt-image-1 and gpt-image-1-mini.
  • Aspect ratio is set through the size parameter, not in prose. Quality is low, medium or high; medium or high is advised for small or dense text.
  • Put literal text in quotation marks, and when editing say what must stay unchanged.

Google Gemini image generation (Nano Banana)

Official docs read · checked 2026-10-11
General notes on Google Gemini image generation (Nano Banana)
  • Google's docs list several Nano Banana models (2.1, 2 Lite, 2, Pro) and recommend 2.1 for new projects as of the verification date.
  • Supported aspect ratios include 1:1, 4:5, 9:16, 16:9 and 21:9; sizes 1K, 2K and 4K. Up to 14 reference images per request.
  • All generated images carry a SynthID watermark.

FLUX (Black Forest Labs)

Official docs read · checked 2026-10-11

FLUX.2 does not use negative prompts, so every constraint here is written as something to do rather than something to avoid.

General notes on FLUX (Black Forest Labs)
  • BFL's official guidance for FLUX.2: no negative prompts (describe what you want), write sentences rather than keyword lists, specify lighting, quote text to render, and pair colour names with hex codes.

Any image generator

Official docs read · checked 2026-10-11
General notes on Any image generator
  • Written as natural-language descriptions that the verified image models accept. Syntax for aspect ratio, quality and negative prompts differs by tool, so set those in your tool's own controls.

Source, license and attribution

Origin
Original by MarketerTools
Publisher
MarketerTools
License
Original work by MarketerTools, free to copy and use. Informed by the linked documentation; no third-party text is reproduced.
Platform assumptions checked
2026-10-11

Documentation and references behind this prompt

These informed the structure and the platform notes. A reference is not a license, and no third-party prompt text is copied here.

Spotted an attribution error, or are you a source owner with a request? Use the chat button at the bottom right and quote prompt ID img-003. We will correct or remove it.

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