# AI Instagram Post Generator > An AI Instagram post generator makes the images for your feed from a description. Instagram keeps photos up to 1080 px wide at their full resolution when the shape is between 1.91:1 and 3:4, so 4:5 (1080 × 1350) portrait and 1:1 square are the safe picks, and 9:16 is for Stories and Reels. On Kenerate AI you make the image in Image Studio with GPT Image 2.5 Sunburst, or a 3–5 card carousel in Marketing Studio. The tools make the pictures; the caption is yours to write, or to draft with the chat agent and check. URL: https://kenerateai.com/ai-instagram-post-generator Publisher: Kenerate AI (https://kenerateai.com) Last updated: 20 October 2026 ## Key facts - Best feed shape: 4:5 portrait, 1080 × 1350 - Also works: 1:1 square · 3:4 (up to 1080 × 1440) - Stories and Reels: 9:16, 1080 × 1920 - Instagram's width: Up to 1080 px kept at full resolution - Carousel: Up to 20 slides on Instagram · 3–5 card sets in Marketing Studio - Captions: Yours to write — the image tools don't write them - Posting: Download and post yourself; Kenerate doesn't post or schedule - Watermark: None ## Steps 1. Open Image Studio — Press “Make a post”. Image Studio opens on GPT Image 2.5 Sunburst. Pick Photo 4:5 (or the Social post preset for 1:1). Sign in free for starter credits. 2. Describe the post — Subject, setting, light and colours. Add any words in quotes, or ask for “no text” and add them later in Edit Studio. 3. Make the set — For a carousel, use Marketing Studio's Carousel set, or upload your first slide as a reference and ask for the next one “in exactly the same style”. Make a 9:16 version for your Story. 4. Caption and post — Download without a watermark, write the caption (or draft it with the chat agent), and post it from the Instagram app or your scheduler. ## In depth ### Which Instagram post size should you make? Instagram's help centre gives 1.91:1 to 3:4 as the range it keeps at full resolution, 1080 px wide. Checked 20 Oct 2026. - Portrait feed post: 4:5 · 1080 × 1350. In Kenerate: Photo 4:5 in Image Studio · Insta portrait in Edit Studio. Use it for: Most posts — it takes the most room in the feed. - Tall feed post: 3:4 · 1080 × 1440. In Kenerate: Portrait 3:4 in Image Studio. Use it for: The newer tallest feed shape. - Square post: 1:1 · 1080 × 1080. In Kenerate: Social post preset · Insta post in Edit Studio. Use it for: Quote cards, product tiles, carousels. - Landscape post: 1.91:1 · 1080 × 566. In Kenerate: Widescreen 16:9 then crop, or Expand Image. Use it for: Wide scenery; shows smallest in the feed. - Story / Reel frame: 9:16 · 1080 × 1920. In Kenerate: Story / Reel preset · Story in Edit Studio. Use it for: Stories, Reel covers, full-screen frames. - Carousel: Same ratio on every slide. In Kenerate: Carousel set in Marketing Studio, or one ratio in Image Studio. Use it for: Tips, steps, before/after, product benefits. ### Instagram post prompts to copy Pick the ratio in Image Studio first. The last prompt needs your first slide uploaded as a reference. - Product post: Instagram feed post, 4:5 portrait. A matte ceramic coffee mug on a sunlit oak table with a croissant and a small vase of dried flowers, soft morning light from a window, warm neutral colours, lots of clean space at the top. No text, no logos. - Quote card: Instagram quote card, square 1:1. Deep green background with a subtle paper texture. In the centre, in a large elegant serif: "Small steps still move you forward." Thin cream border, no other text, generous margins. - Recipe post: Instagram food post, 4:5 portrait, overhead shot of a bowl of lemon garlic pasta with basil on a linen napkin, a wedge of parmesan and a fork beside it, bright natural light, appetising, room at the bottom for a caption overlay. No text. - Carousel cover: First slide of an Instagram carousel, 4:5 portrait. Bold headline "5 desk habits that fix your posture" in big white sans-serif on a coral background, a simple flat illustration of a person sitting upright at a desk, and a small arrow at the right edge. No other text. - Event announcement: Instagram post for a community event, 4:5 portrait. A night market street with string lights and food stalls, cinematic photo. Overlay text "Night Market" large at the top and "Saturday 7 PM" smaller below it, both in clean white letters. No other words. - Story frame: Instagram Story frame, 9:16 vertical. A runner tying her shoes on an empty city bridge at sunrise, cinematic, soft orange light, with clear empty sky in the top third for stickers and text. No text. - Same style, next slide: Using the attached carousel slide as the style reference, make slide 2 in exactly the same style, colours, font and layout: headline "1. Raise your screen to eye level" with a simple flat illustration of a laptop on a stand. 4:5 portrait, no other text. ### Image Studio, Marketing Studio or Edit Studio? Three places on Kenerate make Instagram posts; pick by the job: - Image Studio: any single post from a prompt — product shots, scenes, quote cards — at 4:5, 1:1, 3:4 or 9:16. - Marketing Studio > Posters > Carousel set: 3–5 matching cards built around your product, with the headline and button in the picture. - Edit Studio: Instagram-sized canvases (1080 × 1080, 1080 × 1350, 1080 × 1920), templates, a Text tool for exact wording, and Magic Resize to turn one post into a Story. ### What about the caption and hashtags? The image models don't write captions. The caption is where your voice, your facts and your call to action live, so it's worth writing yourself. If you want help, Kenerate's chat agent can draft one from a short description of the post — then cut it down, check every fact and price, and add the hashtags you actually use. ### How do you keep a feed consistent? Pick two or three colours, one font style and one kind of light, and write them into every prompt as the same sentence. Upload a post you like as a reference when you make the next one. Nano Banana 2.1 and GPT Image 2.5 Sunburst take the most references, which helps a product or a character look the same from post to post. ## FAQ Q: What size should an Instagram post be? A: Make feed posts 1080 px wide. Instagram's help centre says it keeps photos at full resolution when the shape is between 1.91:1 (landscape) and 3:4 (tall), so 4:5 portrait at 1080 × 1350 and 1:1 square at 1080 × 1080 are safe choices, and 3:4 at 1080 × 1440 is the tallest. Stories and Reels are 9:16, 1080 × 1920. Q: Does the AI write my Instagram caption too? A: No — the image tools make the pictures, not the caption. Write it yourself, or ask Kenerate's chat agent for a draft and then edit it so it's accurate and sounds like you. Read every caption before you post; AI drafts can get facts, prices or tone wrong. Q: Can I make an Instagram carousel with AI? A: Yes. Marketing Studio's Carousel set makes three to five cards in one style from your product photo — hook first, one benefit per card, the offer last — square by default. Or make slides one by one in Image Studio at the same ratio, uploading the first slide as a reference so the rest match. Instagram allows up to 20 slides per carousel. Q: Is the AI Instagram post generator free? A: Free to start. A new Kenerate account gets 25 free credits, and Qwen Image 3.0 is a free-plan model with 4:5, 1:1 and 9:16. GPT Image 2.5 Sunburst and the other models use credits from one-time packs with no subscription. Marketing Studio's Carousel set needs a paid plan or a credit pack. Downloads have no watermark. Q: Can AI put text on my Instagram post? A: Yes. Put the exact words in quotes and keep them short — a headline and one line. GPT Image 2.5 Sunburst and GPT Image 2 spell short text most reliably. For exact fonts every time, ask for “no text” and add the words in Edit Studio's Text tool, starting from an Insta post or Insta portrait canvas. Q: How do I turn a square image into a 4:5 post without cropping? A: Open Expand Image, pick 4:5 and the AI paints new image at the top and bottom, so nothing in your original is cut off. You can also make the post at 4:5 from the start by picking Photo 4:5 in Image Studio. Q: Does Kenerate post to Instagram for me? A: No. Kenerate makes the images and you download them, with no watermark. Post them from the Instagram app, Meta Business Suite or the scheduler you already use. Nothing is published to your account automatically. Q: Can I use AI images for business posts and ads? A: Yes. You can use what you make, including on business accounts; Kenerate adds no watermark. Keep claims true, use only your own products, logos and photos, and don't show real people who haven't agreed. For paid Meta ads in every placement, see the AI Facebook ad generator. ## Related pages - AI carousel generator: https://kenerateai.com/ai-carousel-generator - AI Facebook ad generator: https://kenerateai.com/ai-facebook-ad-generator - Photo extender: https://kenerateai.com/photo-extender - AI poster generator: https://kenerateai.com/ai-poster-generator - AI banner generator: https://kenerateai.com/ai-banner-generator - AI product photo generator: https://kenerateai.com/ai-product-photo-generator ## Sources - Instagram Help — Image resolution of photos you share: https://help.instagram.com/1631821640426723 - Social Media Today — Instagram expands carousels to 20 frames: https://www.socialmediatoday.com/news/instagram-expands-carousels-to-20-frames/723792/ - Kenerate Image Studio: https://kenerateai.com/app/image - Kenerate Marketing Studio: https://kenerateai.com/app/marketing-studio