Newsletter headers usually fail in one of two ways: a stock illustration that has nothing to do with the issue, or a heavy hero image that crops weirdly on mobile and goes dark in dark mode. The 10 templates below all target a wide letterbox that fits the email body, lean on flat color and clean type, and reserve a clear text zone so the headline still reads when the inbox blocks images. Each one is written to run as-is in Midjourney, and the syntax notes show how to adapt it for the other 2026 image models.
TL;DR
- Export the finished header around 1200-1600px wide so it stays sharp on retina, but design it to read inside the 600px email column. Keep height to roughly 90-200px in the layout so the actual body content does not get pushed below the fold.
- Do not let the model burn the headline into the image. Compose the headline as live HTML text instead, so it survives image-off inboxes and screen readers.
- Avoid pure-white backgrounds. Outlook on Windows flips almost every color in dark mode, so a midtone or brand color block reads far more predictably than white.
- For accurate in-image text (a banner date, a milestone number), use Nano Banana Pro or Ideogram 4.0. For pure aesthetic quality with no text, Midjourney still wins.
What a high-quality prompt should contain
Six elements every newsletter header prompt should specify:
- Wide aspect: 16:9 or wider (a 16:7 letterbox is common); never square or vertical
- Mobile-safe content zone: keep every critical element inside the centered 60% column
- Dark-mode-safe palette: avoid pure white; off-white or a color block survives inversion
- One graphic anchor: a small illustration, a single product, or a typographic block; pick one
- Text overlay zone: reserve a clear area for the issue headline (add the text in post)
- Brand-coherent palette: two colors plus one accent that mirror your brand site
Which AI image tool to use (June 2026)
The model matters more than the prompt once you need text or a fixed ratio. Quick guide as of June 2026:
| Tool | Best for | Aspect ratio | In-image text | On-site guide |
|---|---|---|---|---|
| Midjourney (v7) | Aesthetic quality, illustration, no text | --ar 16:9 flag | Weak; compose text in post | Midjourney beginner guide |
| Nano Banana Pro (Gemini 3 Pro Image) | Precise text, dates, milestone numbers | 1:1 up to 21:9 | Strongest, with composition control | Nano Banana editing guide |
| Ideogram 4.0 | Posters, signage, short headlines | Preset ratios | Very strong on short text | — |
| GPT Image 2 | Quick in-chat drafts | Limited ratios | Decent | — |
Note: OpenAI retired DALL-E 3 on May 12, 2026; GPT Image 2 is the current default in ChatGPT. The Midjourney --ar flag is Midjourney-only. For Nano Banana Pro and Ideogram, drop the trailing --ar 16:9 and set the aspect ratio in the tool’s ratio field instead.
10 copy-ready prompt templates
1. Brand tagline with product grid
Best for: Product / startup newsletter
Newsletter header image, wide letterbox 16:9, three product shots arranged on a clean off-white background with even spacing, single soft top-down light, generous empty space on the right for headline text, modern minimal brand newsletter aesthetic, --ar 16:92. Illustrated scene with headline space
Best for: Editorial / content newsletter
Newsletter header image, wide 16:9, flat-color hand-illustrated scene of a small desk by a sunlit window with a coffee cup and laptop, soft pastel palette, large empty space on the right for issue headline, modern editorial illustration style, --ar 16:93. Minimal single-line with accent color
Best for: Indie / personal newsletter
Newsletter header image, wide 16:9, single thin horizontal accent line in a saturated coral color running across a deep navy background, small monogram brand-mark in the lower-left corner, generous empty space for centered headline, modern minimal newsletter aesthetic, --ar 16:94. Split-photo with headline overlay
Best for: Magazine-style newsletter
Newsletter header image, wide 16:9, split-photo layout with a half-body editorial portrait on the left half and a soft solid color block on the right half for headline text, soft warm light on the portrait, two-color brand palette, modern magazine newsletter aesthetic, --ar 16:95. Collage of icons with bold title
Best for: Tools / curation newsletter
Newsletter header image, wide 16:9, six small minimal product or app icons arranged in a clean horizontal row on an off-white background, generous empty space below for a bold issue title, soft drop shadows on each icon, modern flat newsletter aesthetic, --ar 16:96. Typographic-only headline
Best for: Essay / opinion newsletter
Newsletter header image, wide 16:9, typographic-only header with a single bold serif title centered on a deep cream background, soft warm paper grain texture, single thin accent rule under the title, modern editorial newsletter aesthetic, --ar 16:9Tip: this is the one template where in-image text actually matters, so run it in Nano Banana Pro or Ideogram 4.0 and put your real title in the prompt in quotes.
7. On-brand pattern with small logo
Best for: Established brand newsletter
Newsletter header image, wide 16:9, subtle geometric pattern background in two muted brand colors, a small clean logo lock-up centered in the bottom-left corner, generous empty space for centered issue headline, modern brand newsletter aesthetic, --ar 16:98. Hand-drawn sketch with heading
Best for: Indie writer / hobby newsletter
Newsletter header image, wide 16:9, hand-drawn line sketch of a simple object (a teapot, a book, a plant) on a soft cream background, single warm accent color for highlights, generous empty space on the right for handwritten-style issue heading, charming indie newsletter aesthetic, --ar 16:99. Event-promo banner with date
Best for: Event / launch newsletter
Newsletter header image, wide 16:9, bold event-style banner with a single large saturated color block and an empty centered area for event title and date, soft confetti or paper-cut accent shapes around the edges, modern event newsletter aesthetic, --ar 16:9Tip: if you want the date rendered in the image, this is a job for Nano Banana Pro or Ideogram 4.0; type the exact date in quotes and verify it character by character.
10. Number-led milestone headline
Best for: Milestone / anniversary issue
Newsletter header image, wide 16:9, single enormous outlined number filling the left third of the frame (representing a subscriber milestone), generous empty space on the right for the celebration headline, soft confetti scattered in the background, deep saturated brand background color, modern celebration newsletter aesthetic, --ar 16:9Common mistakes
- Letting the model burn the headline into the image: in-image text still fails often, and even when it is correct it can be unreadable after a dark-mode color flip
- Vertical or square ratio: it breaks the inbox flow, and readers see awkward crops
- Pure-white background: many dark-mode clients invert it to black and wreck contrast
- Critical content in the outer 20%: mobile email crops the edges
- Over-detailed illustration: it competes with the email body that follows
How to push results further
- Keep one header template per series and vary only the issue-specific element to build recognition over weeks
- Export as a transparent PNG when the design allows it: a transparent background inverts more predictably than a white one across Gmail, Apple Mail, and Outlook
- Test in dark mode before sending; Outlook on Windows is the strictest because it tries to flip nearly every color, including some images
- Compose headline text in Figma at 1500px width so it stays crisp on retina inbox previews
- Always write a one-sentence descriptive alt-text for accessibility and image-off inboxes
For a deeper system that keeps every issue visually consistent, see our consistent image style prompt guide.
FAQ
Q: What size should a newsletter header be?
A: Design it to read inside the standard 600px email column, and keep the header height around 90-200px so the actual body content stays above the fold. Export at roughly 1200-1600px wide so it renders sharp on retina screens, then let the email scale it down.
Q: Should I include the issue headline in the image?
A: You can include a styled headline for visual impact, but always also write the headline as live HTML text in the email body so it survives image-off inboxes and screen readers. If you do bake text into the image, generate it in Nano Banana Pro or Ideogram 4.0, which handle in-image text far better than Midjourney as of June 2026.
Q: How do I survive dark mode?
A: Avoid pure-white backgrounds; pick off-white, a midtone, or a brand color block, and prefer a transparent PNG when the layout allows it. Test in Gmail and Apple Mail dark-mode previews, and especially in Outlook on Windows, which flips nearly every color.
Q: Is illustration or photography better for newsletter headers?
A: Both work. Illustration scales better for a consistent weekly series; photography reads more editorial. Pick one and keep it consistent across the brand.
Q: Which AI tool should I use?
A: Midjourney for pure aesthetic quality with no text. Nano Banana Pro (Google’s Gemini 3 Pro Image model) or Ideogram 4.0 when the header needs an accurate date, milestone number, or short headline rendered in the image.
Q: How do I keep the header from feeling like decoration?
A: Tie it to the issue topic. A random sunrise illustration on every issue is decoration; a header that visually echoes the headline is content.
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Tags: #social-thumbnails #Newsletter #email-header #Image generation #Prompt