Most Substack writers either skip the header image entirely or reuse the same stock photo until readers stop seeing it. This post shows you how to create original, on-brand header art for every issue using an AI image generator — in under five minutes, for a few cents per image.
Quick answer: Use a pay-per-image AI image generator to describe the mood, color palette, and topic of each issue in plain English. You'll get a custom 16:9 header image ready to upload directly to Substack — no design software, no subscription, no image that looks like everyone else's.
Why Substack Header Images Matter More Than Most Writers Think
Your header image is the first visual readers see — in their inbox, on the web version of your post, and as the social preview card when someone shares your link. A generic stock photo or a blank header signals low effort before a single word is read. An original image that matches the issue's theme does the opposite: it sets mood, signals craft, and makes your newsletter feel like something worth opening.
The problem has always been time and cost. Custom illustration is expensive. Stock photos are generic. Canva templates start looking like Canva templates after a few issues. An AI image generator for Substack solves all three — you describe exactly what you want, you get something original, and you pay only for what you use.
What to Include in Your Prompt for a Strong Header
The prompt is the entire job. There's no interface to navigate, no layers to manage. The more specific your description, the more useful the result.
A reliable header prompt has four components:
- Subject or visual metaphor — what's actually in the image
- Mood or atmosphere — the feeling you want the reader to carry into the piece
- Color palette — specific colors anchor the image to your brand
- Style direction — editorial illustration, cinematic photography, flat graphic, oil painting, etc.
Subject and Visual Metaphor
Translate the issue's topic into something visual. A newsletter about attention and focus might use an image of a single lit candle in a dark room. A piece about economic uncertainty might show an empty storefront with warm late-afternoon light. You don't need to illustrate the argument literally — a strong metaphor works better.
Mood and Color Palette
Mood words like "quiet," "urgent," "melancholy," or "optimistic" shape the lighting, composition, and color grading of the result. Add specific hex codes or color names if you have a brand palette. "Warm amber and deep navy" is more useful than "nice colors."
Style Direction
Match the style to your newsletter's existing aesthetic. If you publish long-form essays, editorial illustration or moody photography tends to fit. If you write a personal newsletter with a lighter tone, a loose watercolor or graphic art direction might suit better.
Step-by-Step: Creating a Header Image for Each Issue
- Write one sentence summarizing the issue's core idea. This becomes the seed of your prompt.
- Translate the idea into a visual metaphor. Ask: if this were a magazine cover, what would the image show?
- Add mood, color, and style. Layer in the atmosphere words and style direction.
- Generate the image at ATXP Pics. Describe it in plain English — no special syntax required.
- Review and refine. If the first result is close but not right, adjust one element (mood, palette, or subject) and generate again.
- Upload to Substack. Drop the image into the header slot. Done.
The whole process takes three to five minutes once you've done it twice.
Real Prompt Examples You Can Copy
These are ready to use or adapt for your own issues:
"Editorial illustration of a single lighthouse beam cutting through dense fog at dusk, muted teal and charcoal palette, quiet and contemplative mood, textured grain finish"
"Overhead flat-lay photograph of an open notebook, a cold cup of coffee, and morning light through blinds casting long shadows, warm cream and brown tones, editorial photography style"
"Abstract graphic of tangled threads slowly unraveling into a clean line, deep indigo and off-white, minimal and modern, slight paper texture"
"Cinematic wide shot of an empty train platform in winter, pale gray light, one figure in the distance, melancholy and reflective, film photography grain"
Each of these gives the generator a subject, a mood, a palette, and a style — which is all you need for a strong result.
How the Cost Compares to Any Alternative
Pay-per-image pricing makes the math straightforward for newsletter writers. You publish when you publish — you shouldn't pay a monthly fee during the weeks you're not creating.
| Option | Monthly cost | Images/month | Cost per image | |---|---|---|---| | Midjourney Basic | $10/mo | ~150 | ~$0.07 (but charged every month) | | Midjourney at 5 uses/mo | $10/mo | 5 | $2.00/image | | Stock photo site | $15–29/mo | Unlimited | Still not original | | ATXP Pics (pay-per-image) | $0 unless you create | As needed | A few cents |
If you publish weekly, you need roughly four header images a month. At a few cents each, that's under $1 total. With a subscription tool, you pay $10 whether you publish four issues or zero.
Create your next Substack header →
Building a Consistent Visual Identity Across Issues
Consistency in your visual style is what makes a newsletter feel like a brand. You don't need every header to look identical — you need them to feel related.
Pick two or three elements to hold constant across issues:
- Color palette — mention the same 2-3 colors in every prompt
- Style direction — always use editorial illustration, or always use photography-style, not a random mix
- Mood anchor — a word like "quiet," "sharp," or "curious" that runs through your newsletter's tone
Keep a running note with your standard style line — something like: "editorial illustration, warm amber and slate blue, textured grain, contemplative mood" — and paste it into every new prompt before adding the issue-specific subject. Your headers will look like a cohesive series without any extra effort.
What to Avoid
- Vague prompts — "a nice image about creativity" will return something generic. Always include a specific subject, mood, and style.
- Literally illustrating your title — if your issue is titled "The Attention Economy," don't prompt for an image of coins and eyeballs. Go one level more abstract.
- Ignoring the 16:9 ratio — Substack crops aggressively on mobile. Specify "wide horizontal composition" or "16:9 landscape format" in your prompt so the key visual element lands in the safe center zone.
- Switching styles every issue — visual variety is good; visual incoherence is not. Anchor one or two elements and vary the subject.
Original header art is one of the fastest ways to make a Substack newsletter feel more considered than the competition. With a pay-per-image AI image generator, there's no subscription to justify and no month where you pay for images you didn't make.