The new season's pieces have arrived and you want to announce them on Instagram. The usual question is "what do we post?" The one that gets skipped is "in which format?" Yet the same photo says one thing in the feed and another in a Story, and a vertical video that plays well as a Reel gets cropped, or never goes out, when scheduled as a feed post.
Below: how to pick each of Instagram's four formats by goal, the technical limits of each, and how a fictional boutique spreads one idea across all four. A short pre-posting checklist closes the article.
What is each format for?
Feed post
The classic single-image post. It shows up in followers' feeds and stays on your profile grid for anyone who looks you up later. That makes it your shop window: the best product shot, an announcement, one clear message. If you need more than one frame to explain something, it's too tight.
Carousel
A post of 2 to 10 items that people swipe through, suited to anything sequential: a process, a comparison, the pieces of a collection. Its strength is order: the first frame creates curiosity, the middle ones give detail, the last says what to do next. Things people come back to, like a size chart or care tips, work well here.
Reels
A single vertical video. Reels are the likeliest way to reach people who don't follow you yet, and also the format people swipe past if the first seconds don't hold them. Movement, transformation and how-to content feel natural here. A Reel also sits on your profile grid as a single frame, which is why the cover matters.
Story
A single full-screen vertical image or video. A Story disappears after 24 hours and mostly reaches existing followers, so it's for quick, everyday news: "New pieces are in", "Open until 8 p.m. today". There's no visible caption, so put the message on the image itself.
Pick the format by goal
Start from what the post should do, not from the media you happen to have. The table matches common goals with a format and its technical requirements.
| Goal | Format | Technical requirement |
|---|---|---|
| Show a product or announcement permanently on your profile | Feed post | Single image; aspect ratio 0.75-1.91; caption up to 2,200 characters and 30 hashtags |
| Walk through a collection, process or comparison in order | Carousel | 2-10 items; each item 0.75-1.91; same caption and hashtag limits as the feed |
| Reach non-followers, show movement | Reels | Single vertical video, 9:16; file up to 95 MB (MP4, MOV, WebM); cover image or a frame from the video |
| Give followers short-lived news | Story | Single image or video, 9:16 vertical; the message sits on the image |
| Put a product in the window and get it discovered | Feed + Reels | Two separate files: a 4:5 photo and a 9:16 video |
| Remind people a campaign ends today | Story | Single item; date and time on the image |
Aspect ratio is simply width divided by height. A 1080×1350 photo is 0.8 (4:5) and works in the feed; a square is 1 and a 1.91:1 landscape is 1.91, both in range. A vertical phone video is 9:16, roughly 0.56, below the feed range. That's why vertical video belongs in Reels or Stories.
Spread one idea across four formats: the Lina Atelier example
Lina Atelier is a fictional boutique selling handmade linen dresses and shirts, with two people running its Instagram. They want to announce the autumn collection.
- 1
Boil the idea down to one sentence
Lina Atelier's was: "The autumn linen collection is here, 8 pieces." Each format shows a different side of it; none starts from scratch.
- 2
Put the hero photo in the feed
One 4:5 photo of the whole collection. The caption tells its story; hashtags stay well under 30, only ones that really fit.
- 3
Show the pieces in order in a carousel
The most striking dress first, the other seven next, sizing and address last. Nine items, all 4:5; mixed ratios cause cropping and an uneven look.
- 4
Show movement in a Reel
A 20-second vertical video of how the fabric falls. The dress turns in the first two seconds; on-screen text stays clear of the top and bottom edges, where the interface covers it.
- 5
Say when in a Story
One vertical image: "New season on the rails tomorrow at 10 a.m." No caption shows, so the date and time are on the image.
What happens when a vertical video goes to the feed?
Lina Atelier's old problem is common: nobody thinks about format until publishing time. Instagram accepts a specific ratio range for feed posts and carousels. Posting by hand, the app shows you a crop screen; a scheduled post has none, and media that doesn't fit can fail at publishing time.
VonaHub Instagram scheduling runs this check while you plan. If a feed or carousel item falls outside 0.75-1.91, the post is stopped before publishing and a better format is suggested; for a vertical video, "Use Reels". A caption over 2,200 characters or more than 30 hashtags triggers a warning on the same screen. The format is suggested from your media, and the preview follows it: Reels and Stories show in a 9:16 frame.
Posting by hand? Divide width by height and compare with the table. Two minutes of arithmetic beats an announcement that vanishes.
Choose your Reels cover on purpose
A live Reel sits on your profile grid as a single frame. Leave the cover to chance and it can be any moment: a half-closed eye, a blurry transition, half-shown text. First-time visitors read the grid like a shop window, and messy covers look careless even when the content is good.
Two options:
- Upload a cover image. Use a designed image that can carry the collection name. The grid may crop the edges, so keep text centered.
- Pick a frame from the video. Use the frame at any second as the cover. Choose a moment where the product is sharp and still.
In VonaHub, if both are set, the cover image wins. Changing the cover later doesn't reset the post's client approval, so agencies don't need a second sign-off just for a new cover.
How does the same content behave on Facebook?
Instagram content often goes to your Facebook Page too. Facebook's formats are Post, Video, Reels and Story, with slightly different rules.
- Expect a single vertical image to go out as a regular post. On Facebook, a single image, even a vertical one, is a regular post by default. Switch the format if you want a Story or Reel.
- Choose the format per platform. When one post is planned for both, each gets its own format, such as a Reel on Instagram and a video on Facebook.
- Prepare the Facebook cover as an image. Facebook has no frame picker for video and Reels covers; the uploaded image is used. If you picked a frame on Instagram, export it as an image for Facebook.
Details are on the Facebook Page management page; for using both platforms as a local business, see this article.
Instagram schedulingPlan all four formats on one calendar and catch media that won't work before it's published.Check the format before you post
Format check before posting
- Write the post's goal in one sentence: shop window, explanation, discovery or daily news.
- Pick the format that matches the goal from the table.
- Confirm feed and carousel media sits between 0.75 and 1.91 (width ÷ height).
- Keep carousels at 2-10 items, all in the same ratio.
- Mark vertical videos as Reels or Stories, never as feed posts.
- Upload a Reels cover image or pick a sharp frame from the video.
- Keep the caption under 2,200 characters and hashtags under 30.
- Put a Story's date, time and address on the image.
- Set the Facebook format separately and add a cover image there.