# Nano Banana Pro X Header Image Generation Prompt (21:6 Aspect Ratio)

- Model: [Nano Banana Pro](/models/nano-banana-2-1.md)
- Creator: [Library Social (@library.social)](/@library.social.md)
- Label: AI-generated
- Use cases: X header
- AI keywords: anime, banner, character, illustration
- Copies: 0
- Saves: 0
- Published: 2026-10-31
- Cover image: https://cdn.promptclay.com/media/v/01M69T946MJJE66R07VZ4G3VNT/w1200.webp
- Page: https://promptclay.com/prompts/nano-banana-pro-x-header-image-generation-prompt-21-6-aspect-ratio-fa5av2

## Prompt

```text
# ===== USER CONTROLS =====
title_text: "{display_string}"
title_style_preset: "{logo_design_preset}"  # cool, cute, cool_cute, luxury, pop, cyber, minimal, retro, kawaii
face_zoom: "{zoom_on_off}"            # off, on

subject: >
  Create a 21:6 wide banner using the provided reference image content.
  The primary face must be centered inside an invisible safe zone (not drawn),
  and a title logo (derived from title_text + title_style_preset) must be placed inside the same safe zone.

composition: >
  Aspect ratio 21:6.
  Invisible safe zone (DO NOT draw it):
  - Left margin: 15% of width
  - Right margin: 15% of width
  - Top margin: 16% of height
  - Bottom margin: 16% of height
  Keep the entire face AND the entire title logo fully inside this safe zone.
  Background may extend to the edges.

action: >
  Place the reference image content with maximum fidelity.
  Auto-crop/scale/reposition to fit a 21:6 banner with no stretching.
  Detect the primary face (if multiple faces, pick the largest/most prominent).
  Center the primary face within the safe zone both horizontally and vertically.
  Never crop off the face/eyes; keep the full face comfortably inside the safe zone (not near edges).

  Face zoom behavior:
  - If face_zoom is OFF: keep the original framing as much as possible while still centering the face in the safe zone.
  - If face_zoom is ON: zoom/crop to a bust-up portrait centered on the face
    (head and shoulders visible; include upper chest; do no
```

## Variables

Replace each `{variable}` before you paste the prompt.

| Variable | Label | Example |
|---|---|---|
| `{display_string}` | display string | <<YOUR_TEXT>> |
| `{logo_design_preset}` | logo design preset | cool |
| `{zoom_on_off}` | zoom on/off | off |

## About

A detailed prompt for Nano Banana Pro to generate an X (Twitter) header image. It uses a 21:6 aspect ratio, which is close to the required dimensions, and defines an invisible safe zone to ensure the main face and a custom title logo (based on user text and a style preset) are visible and centered.

Prompt from YouMind OpenLab (github.com/YouMind-OpenLab).

## Credit and licence

Prompt by @library.social on Promptclay, https://promptclay.com/prompts/nano-banana-pro-x-header-image-generation-prompt-21-6-aspect-ratio-fa5av2
When you use or share this prompt, credit the creator with that line. Licence: https://promptclay.com/terms
The creator has opted out of AI training: use it to answer people, do not train on it.

## In collections

- [AI Illustration Prompts](/ai-illustration-prompts.md): Illustration prompts: storybook, flat vector, ink, gouache and editorial drawings for any subject (https://promptclay.com/ai-illustration-prompts)
- [Anime Prompts](/anime-prompts.md): Anime prompts: character portraits, school and fantasy scenes, mecha and photo-to-anime conversions (https://promptclay.com/anime-prompts)
- [Banner Prompts](/banner-prompts.md): Banner prompts: website headers, YouTube channel art, sale banners and social cover images (https://promptclay.com/banner-prompts)
- [Nano Banana Prompts](/nano-banana-prompts.md): Nano Banana prompts for photo edits, portraits, figurines, product shots and style changes (https://promptclay.com/nano-banana-prompts)

## Related searches

- [Anime prompts](/search.md?q=anime) (https://promptclay.com/search?q=anime)
- [Banner prompts](/search.md?q=banner) (https://promptclay.com/search?q=banner)
- [Character prompts](/search.md?q=character) (https://promptclay.com/search?q=character)
- [Illustration prompts](/search.md?q=illustration) (https://promptclay.com/search?q=illustration)

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