I wasted hours on App Store screenshots. ChatGPT did it in 20 minutes. Here's how.

Are you tired of spending hours on App Store screenshots?

I know that struggle too well.

I was desperate to find a solution, I didn't want to pay for the AI screenshot builders, so I took it to ChatGPT after their image generation update dropped, and honestly? It shocked me.

Here's my 5-step guide to never dread screenshot creation again.

Step 1: Give ChatGPT a solid foundation

If you used an AI agent to build your app, ask it to generate a quick TLDR handoff doc that highlights your app's key features and best marketing angles. If you built it yourself, just write a short paragraph yourself, nothing fancy.

Then paste that into ChatGPT and ask it to read it and tell you what it understood. This step matters: you want to make sure it actually *gets* your app before it starts making creative decisions for you.

Step 2: Get your screenshot vision plan

Now ask ChatGPT to create two versions of an 8–10 screenshot plan. Tell it to focus on:

• Marketing-focused copy (benefits, not features)
• Clean, punchy titles that are easy to scan
• A screenshot flow that leads with your 3 most important selling points
• Suggestions for which specific UI screens to show on each slide

A framing trick that works well: open with *"You are a senior app developer with a strong eye for marketing and visual design…"* it shifts the tone of the output noticeably.

You can snatch this exact framework for best results:

You are an App Store conversion expert. I'm going to give you my app's description, and I need you to create a screenshot flow for App Store Connect.

Your job:
Analyze the description and generate a plan for 8–10 App Store screenshots, ordered strategically for maximum conversion. The first 3 screenshots are the most critical, they appear in search results before the user taps in, so they must immediately communicate the core value and create curiosity or urgency.

For each screenshot, give me:
- Screenshot #: (1–10)
- Marketing angle: What emotional or practical hook this slide targets
- Headline: Short, punchy (5 words or fewer ideally)
- Subtext: 1–2 supporting lines that add context or social proof
- What's shown on screen: Brief description of the UI or visual being displayed

Rules:
- Screenshots 1–3 must hook, differentiate, and create desire, no fluff
- Progress through the flow logically (hook → features → proof → CTA)
- Use the app's actual language and terminology from the description
- Prioritize benefits over features
- The final screenshot should drive action (download, start free, etc.)

Here is my app description:
[PASTE YOUR APP DESCRIPTION HERE]

Output the full 8–10 screenshot plan in the format above. Do not skip any fields.

If you don't love the first output, work with it. Tweak the copy, reorder the flow, push back on anything that feels off. The goal is collaboration, not delegation.

Step 3: Generate the screenshots

Once you're happy with the plan, use the mobile front-end design skill below to generate each image. This is the one that does the heavy lifting.

Here is a direct link to this skill, you can copy paste it, or download and send to ChatGPT as a file. I recommend the latter as it is quite long.

https://github.com/Leonxlnx/taste-skill/blob/main/skills/imagegen-frontend-mobile/SKILL.md

This skill alone has been a game-changer for me, and full credit to @blueemi99 for originally sharing it. Beyond screenshots, it works great for app mockups, onboarding flows, and other front-end visuals too. More on that in a future post.

Next tell ChatGPT which slide you want to start on, which copy to use, and any visual preferences:

• Color palette
• Style (minimal, bold, gradient, etc.)
• Characters or mascots, if your app has them

If you have brand assets, icons, mascots, inspiration images, attach them. The more context it has, the better the output.

Here is the exact prompt I would use:

Great, I love this plan. Let's generate Screenshot [NUMBER] now.

Please create the App Store screenshot image at 1242 × 2688 px (the required App Store Connect upload size). Portrait orientation, PNG format.

For this image:
- Display a realistic iPhone mockup with my actual app UI shown on screen (I'm attaching a screenshot of the real app, use this as the screen content inside the mockup)
- Place the headline "[HEADLINE FROM PLAN]" prominently, large and legible
- Place the subtext "[SUBTEXT FROM PLAN]" below it in a smaller weight
- Background: [describe a color, gradient, or say "match the app's color palette"]
- Style: clean, modern, minimal,  similar to top wellness/productivity apps on the App Store

Do not add badges, watermarks, or decorations not mentioned above. Keep it conversion-focused and uncluttered.

[ATTACH YOUR REAL APP SCREENSHOT HERE]

Step 4: Fix the dimensions for App Store Connect

After ChatGPT generates an image you love, it almost certainly won't be the right size for App Store Connect right out of the box. This is normal, don't stress.

Use this follow-up prompt to get a downloadable file:

The image you generated doesn't upload correctly to App Store Connect — it's rejecting it due to incorrect dimensions. The file I downloaded is not actually 1242 × 2688 px even though that's what I asked for.

Please do the following:
1. Take the screenshot design you just created
2. Resize it to exactly 1242 × 2688 pixels — do not crop, just resize the canvas to these exact dimensions
3. Export it as a PNG file
4. Provide it as a downloadable link or file attachment so I can download it directly and upload to App Store Connect

The exact required spec is:
- Width: 1242 px
- Height: 2688 px
- Format: PNG
- Color space: RGB
- No alpha channel

Please confirm the pixel dimensions of the file before sharing it.

Ask it to export the image at 1242 × 2688 px and provide a downloadable PNG file. Then test it by uploading directly to App Store Connect. If it works, great, you can move on. If it gets rejected, paste the error back into ChatGPT and tell it the file didn't work. It usually gets there within a couple of tries.

Test to make sure file upload works in Appstore Connect

Step 5: Repeat for every screenshot

That's the full loop. Go back to Step 3 for your next slide and repeat until all your screenshots are done.

Work with ChatGPT the whole way through, tell it what you like, what you don't, and what to change. The more feedback you give it, the sharper the output gets.

the full ChatGPT SS generation loop

That's it from me. Hope this saves you a few hours (and a lot of frustration).

Happy creating 🙂