Instagram Post Format- Instagram supports six main post formats — square, portrait, landscape, carousel, Stories, and Reels. Each has its own recommended dimensions, aspect ratio, and file requirements. Getting these right prevents cropping issues, blurry output, and display errors.

Every Instagram Post Format at a Glance

Before diving into each format individually, here's the full spec table. Bookmark this if you're frequently exporting content for Instagram.

Format

Dimensions

Aspect Ratio

File Type

Limit

Square Image

1080×1080px

1:1

JPG, PNG

30 MB

Portrait Image

1080×1350px

4:5

JPG, PNG

30 MB

Landscape Image

1080×566px

1.91:1

JPG, PNG

30 MB

Carousel

1080×1080px or 1080×1350px

1:1 or 4:5

JPG, PNG, MP4

10 slides

Stories (Image)

1080×1920px

9:16

JPG, PNG

30 MB

Stories (Video)

1080×1920px

9:16

MP4

15 sec/segment

Reels

1080×1920px

9:16

MP4 (H.264)

90 sec

Feed Video

1080×1350px

4:5

MP4

60 sec / 4 GB

Profile Photo

320×320px

1:1

JPG, PNG

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Instagram Feed Image Post Formats

Feed images are what most people think of first — the posts that live permanently on your profile grid. Instagram currently supports three orientations.

Square Posts — 1:1 Aspect Ratio

Dimensions: 1080×1080px.

Square was Instagram's original and only format for years. It still works well because it displays consistently across all grid layouts without unexpected cropping. In practice, brands with strong grid aesthetics — uniform color palettes, tiled layouts — tend to lean on the square format because it gives the most predictable result.

What's worth noting: your grid thumbnail will always display as a square, regardless of which format you post. So even if you upload a portrait image, the grid preview gets cropped to 1:1. Keep that in mind when deciding where to place key visual elements.

Portrait Posts — 4:5 Aspect Ratio

Dimensions: 1080×1350px.

Portrait is widely considered the most effective format for feed images if maximizing screen real estate is the goal. It takes up more vertical space in the scroll, which means more of a viewer's screen is occupied by your content before they swipe past.

The trade-off — your grid thumbnail still crops to square. So if your photo has a subject near the top or bottom, it might look odd in the grid view even if the full post looks fine in the feed.

Landscape Posts — 1.91:1 Aspect Ratio

Dimensions: 1080×566px.

Landscape is the least commonly used format for feed images. It takes up the least screen space during scrolling, which is generally a disadvantage in a fast-moving feed. It suits wide-angle photography, cinematic shots, or panoramic visuals where the horizontal composition is essential to the image's meaning.

What Happens If Your Image Doesn't Match These Dimensions?

Instagram won't reject the image outright. Instead, it will prompt you to crop, or apply an automatic crop depending on how far off the aspect ratio is. If the image falls completely outside the supported range of 1.91:1 to 4:5, Instagram forces a crop with no adjustment option.

In practice, content teams commonly report losing important visual elements — faces, logos, text — to unexpected auto-crops when images aren't prepared to spec. The fix is straightforward: prep your assets at the right ratio before uploading.

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Instagram Carousel Post Format

A carousel lets you publish up to 10 images or videos in a single post. Viewers swipe horizontally through the slides.

Dimensions and Slide Count

Use 1080×1080px (square) or 1080×1350px (portrait) for carousels. Mixing the two within a single carousel is technically possible but not recommended — Instagram defaults to the first slide's aspect ratio for all slides.

If subsequent slides don't match, they'll be automatically cropped to fit.Keep all slides consistent in size. This is the single most common formatting error in multi-slide posts.

Mixing Images and Videos in a Carousel

Supported. You can combine still images and short video clips within the same carousel. Each video slide follows the same file type requirements as feed videos — MP4 preferred.

How Carousels Display in the Feed

The first slide acts as the feed thumbnail. This is the only slide visible before a user interacts. It carries the same weight as a standalone post in terms of first impression, so treat slide one with the same care as any regular post.

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Instagram Stories Format

Stories are vertical, full-screen posts that disappear after 24 hours. The format is distinct from feed posts in both dimensions and behaviour.

Recommended Dimensions

1080×1920px at a 9:16 aspect ratio. This fills the entire phone screen, which is why anything smaller gets letterboxed or stretched.

Safe Zone — Where Not to Place Key Content

This is what most guides skip. Instagram overlays interface elements on Stories — the profile name and timestamp appear at the top, and the reply bar or swipe-up CTA sits at the bottom. Placing text, logos, or critical visuals in these zones means they'll be partially obscured.

As a general rule, keep important content within the middle 1080×1420px area and away from the top ~250px and bottom ~400px.

Image vs. Video Stories

  • Images display for 5 seconds automatically
  • Videos can be up to 15 seconds per segment; anything longer gets automatically split into 15-second clips
  • Maximum recording length before Instagram splits the clip: 60 seconds total (four 15-second segments)

Instagram Reels Format

Reels are short-form vertical videos with their own tab on the Instagram profile and a dedicated discovery surface. According to TechCrunch, Instagram's head Adam Mosseri has confirmed that almost all of the platform's recent growth has been driven by Reels, DMs, and recommendations — which is why getting the Reels format right matters more than ever.

Recommended Dimensions

1080×1920px at 9:16. Same physical dimensions as Stories, but Reels behave differently across Instagram's surfaces.

How Reels Display Across Different Surfaces

This trips up a lot of creators. A single Reel displays differently depending on where it's being viewed:

  • Reels tab / full screen playback: 9:16 (full vertical)
  • Feed scroll: cropped to 4:5
  • Profile grid: cropped to 1:1

What this means practically: if you place text or faces near the very bottom or sides of your Reel, they may be cut off when the video appears in the feed or grid. Design with the 4:5 safe area in mind, even if you're shooting in 9:16.

Video Specs for Reels

  • Max duration: 90 seconds
  • Recommended frame rate: 30fps
  • File type: MP4 (H.264 codec)

Reel Cover Photo

The cover photo displays at 1:1 in the profile grid. You can select a frame from the video or upload a separate image. If you choose a frame from near the top or bottom of the video, there's a good chance it'll get cropped awkwardly in the grid — worth checking before publishing.

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Instagram Feed Video Post Format

Feed videos are distinct from Reels. They sit in the feed like a regular image post but play as video.

Dimensions and Aspect Ratio

1080×1350px at 4:5 is the recommended format. The platform supports the full range from 1.91:1 to 4:5, but portrait (4:5) uses the most screen space and is generally the better default.

File and Duration Limits

  • Max file size: 4 GB
  • Max duration: 60 seconds
  • Recommended frame rate: 30fps

Feed Video vs. Reel — What's the Actual Difference?

Functionally, Reels get distributed through the Reels discovery tab and the algorithm pushes them to non-followers more actively. Feed videos stay closer to your existing audience. Format-wise, the main differences are duration (Reels go up to 90 seconds, feed videos cap at 60) and the display surfaces each format appears on.

Instagram Profile Photo Format

Upload Size and Display Behaviour

Instagram recommends uploading at 320×320px minimum. The image is displayed as a circle  not a square so any corners in your image get cut off. Keep the main subject centered and avoid placing anything important near the edges.

Instagram Ad Post Formats — A Brief Overview

Instagram ad formats mirror their organic counterparts in terms of dimensions. The specs are the same — what changes is placement of CTA buttons, headline text, and compliance with Meta's ad policies.

As data from Statista shows, Instagram reached 3 billion monthly active users as of early 2025 a scale that makes precise ad formatting critical to avoid wasted impressions from poor display quality.

Ad Type

Specs

Feed Image Ad

Same as organic feed image (1080×1080px or 1080×1350px)

Stories Ad

Same as organic Stories (1080×1920px); account for CTA bar at bottom

Reels Ad

Same as organic Reels (1080×1920px, 9:16)

Carousel Ad

Same as organic carousel (1080×1080px or 1080×1350px, up to 10 slides)

Common Instagram Post Format Mistakes

  • Uploading below-minimum resolution — Instagram compresses images aggressively; low-res uploads look noticeably blurry
  • Wrong aspect ratio for Reels — horizontal or square video uploaded to Reels results in black bars on either side
  • Inconsistent carousel slide dimensions — the first slide sets the crop for the rest; mismatched slides get auto-cropped
  • Text in crop-risk zones — relevant for both Reels (grid/feed crop) and Stories (UI overlay zones)
  • Uploading in unsupported file types — Instagram accepts JPG and PNG for images; MP4 with H.264 for video; other formats may fail silently or reduce quality

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Conclusion

Every Instagram post format has a fixed set of specs. Use 1080px wide as your baseline. Default to 4:5 for feed content and 9:16 for Stories and Reels. Prepare assets to spec before uploading — Instagram's auto-crop isn't always predictable.

Frequently Asked Questions

Q1: What is the best Instagram post format for the feed in 2026?

Portrait (1080×1350px, 4:5) takes up the most vertical screen space in the scroll, making it the most practical choice for feed visibility. Square (1:1) works well when grid consistency matters more.

Q2: What aspect ratio should Instagram Reels be?

9:16 — matching a full vertical phone screen at 1080×1920px. Design with the 4:5 crop in mind since Reels appear cropped in the feed.

Q3: How many slides can an Instagram carousel have?

Up to 10 slides per carousel post. Each slide can be an image or short video, and all slides should use the same aspect ratio as the first slide.

Q4: What file format does Instagram accept for video?

MP4 with H.264 encoding is the recommended standard for all Instagram video formats — Reels, feed video, Stories, and carousel video slides.

Q5: Can I use the same image for both a feed post and a Story?

Not without resizing. Feed images are 4:5 or 1:1; Stories are 9:16. A feed image placed in a Story will either be letterboxed or cropped — it won't fill the screen without adjustment.