How to create Instagram posts with AI: a workflow from brief to finished carousel

Most people try AI for Instagram the same way: type "make a post about our spring promotion," get something generic, and go back to the old template. The problem usually isn't the tool. It's the brief, the format and the review step around it.

This guide walks through a workflow that holds up week after week: what kind of AI tool fits, how to write a brief the AI can follow, the sizes Instagram accepts, how to build a carousel, what to check before posting, and what Meta's labels and US copyright guidance mean for AI-made posts.

What does it mean to create Instagram posts with AI?

Creating Instagram posts with AI means writing a brief and letting a generative tool produce the design, the text on it, or both, in a size Instagram accepts, then reviewing it before you publish. AI does the drafting; you still decide the message and approve the result.

Three kinds of tools do this job differently:

How do you write a brief that AI can follow?

Write the brief like instructions to a designer you've never met: the format, the exact words that must appear, who the post is for, your colors and logo, and one example of the style you want. Vague briefs produce generic posts.

A complete brief has seven parts:

1. Format. Feed portrait, square, story or carousel, and the number of slides.
2. Goal. What the reader should do: save it, comment, book a call.
3. Exact on-image text, in quotes. "3 signs your AC needs service before summer." If you don't give the words, the AI writes its own.
4. Audience. "Homeowners in a hot climate who haven't serviced their unit in a year."
5. Brand colors and fonts. Hex codes if you have them.
6. Logo and photos. Attach the files rather than describing them.
7. Style reference. One post you like, with a note on what to borrow (layout, mood, type) and what not to copy.

Example brief (for a hypothetical HVAC company):

Feed portrait post. Headline: "3 signs your AC needs service before summer." Subtext: "Book a check-up this month." Audience: homeowners. Colors: navy #1B2A4A and white, with orange #F28C28 for the highlight. Logo attached, bottom right. Clean, flat illustration of a wall unit. No stock-photo people.

What sizes should AI-made Instagram posts use?

Use 4:5 portrait or 1:1 square for feed posts and 9:16 for Reels. Meta's developer documentation says feed images must fall within a 4:5 to 1.91:1 aspect ratio, in JPEG, up to 8 MB, between 320 and 1440 pixels wide.

Two details save rework. Instagram's Help Center says you choose one orientation for the whole carousel and can't pick a different one per slide. And Meta's publishing documentation says carousel images are cropped to the first image's aspect ratio. Generate every slide in the same size from the start.

How do you make an AI carousel for Instagram?

Plan the carousel as a sequence of slides, one idea each, then generate it slide by slide and regenerate only the weak ones. A carousel is a short argument, not a stack of separate posts.

1. Pick one topic and a promise. "5 questions to ask before hiring a bookkeeper."
2. Choose the number of slides. Instagram allows up to 20; most educational carousels need far fewer. Count one slide per idea plus a cover and a closing slide.
3. Write the cover as a hook. It's the only slide most people see before deciding to swipe.
4. Write the text of each slide yourself, or have AI draft it and edit it. Keep each slide to one point.
5. Lock the style and palette before generating, so slide 6 looks like slide 1.
6. End with one action. Save, comment a keyword or visit the link in bio. If you use a comment keyword, pair it with a lead magnet; see these lead magnet ideas for service businesses.
7. Review every slide at phone size before scheduling.

How do you keep AI-generated posts on brand?

Give the AI the same brand kit every time: logo files, color codes, fonts, two or three reference posts and a short note on tone. Consistency comes from repeating inputs, not from hoping the model remembers.

• Logo: a transparent PNG, attached rather than described.
• Colors: two or three hex codes, with one marked as the highlight color.
• Type: the feel you want (bold sans-serif headlines, light body text).
• References: your own best-performing posts, so the AI borrows your style instead of someone else's.
• Words to avoid: jargon, claims you can't back up, emojis if they aren't your style.

Agencies that produce for several clients should keep one kit per client and never mix them in the same session. For how agencies organize this across accounts, see the guide to social media management tools for agencies.

What should you check before publishing an AI-generated post?

Check every word, number and logo on the image, look for visual artifacts, and confirm the claims are true. Text on an image can't be edited after you post, so the review happens before scheduling.

Instagram's Community Guidelines ask you to share only content you've created or have the right to share. That applies to the photos and references you feed into an AI tool, too.

Do you have to label AI-generated posts on Instagram?

Meta applies an "AI info" label when it detects industry-standard signals that content was made with AI, or when you disclose it yourself. Meta renamed the label from "Made with AI" to "AI info" on July 1, 2024.

Since September 12, 2024, content that was only modified or edited with AI tools shows the label in the post's menu, while AI-generated content can still carry a visible label. Meta also says it removes content that breaks its policies whether a person or AI created it.

A sensible rule for businesses: if an image could make someone believe a real person said or did something, or that a real event happened, disclose it. For a flat illustration with your headline on it, the label is mostly a transparency choice.

Who owns an Instagram post made with AI?

In the US, copyright protects the parts of an AI-assisted post where a human determined the expressive elements, not the parts a machine generated from a prompt. That's the conclusion of the US Copyright Office's report on copyrightability, published January 29, 2025.

What the report means in practice:

• Prompts alone don't make you the author of the generated image.
• Your own text, photos and logo stay yours when they appear in an AI design.
• Creative arrangements or modifications you make to the output can be protected.
• Using AI to assist doesn't by itself make a work unprotectable.

This is a summary of official guidance, not legal advice. If a design is central to your brand, such as a logo or a mascot, have a person create or substantially rework it.

How to do this in LUME Hub

LUME Hub is an all-in-one platform for small businesses, consultants and agencies. Its AI design studio, CAPI IA, creates complete posts and carousels from a brief and is included from the Growth plan up.

Each design costs 1 Capi Coin and a carousel costs half its page count; the plan includes a monthly quota, and regenerating a carousel page is free. The LUME Hub app screens are in Portuguese today; the product page explains every feature in English. You can start your 7-day free trial with no credit card, or see the plans.

Summary

To create Instagram posts with AI, start with a brief that names the format, the exact on-image text, the audience, your colors, your logo and one style reference. Generate feed posts in 4:5 or 1:1 and Reels in 9:16, and keep every carousel slide in one orientation, since Instagram applies a single ratio to the whole post. Build carousels one idea per slide, lock the style first and regenerate only the weak slides. Proofread every word and number on the image, check the logo and the rights to every input, and disclose AI use when an image could mislead. Under US Copyright Office guidance, your human-made text, photos and creative changes are protectable, while a prompt alone is not.