What Size Is Instagram Post? Every Dimension & Format That Actually Matters in 2026

If you've ever uploaded a photo and watched Instagram crop it in ways you didn't plan, you already know why understanding what size is Instagram post matters before you hit publish.

The platform runs on a fixed set of dimensions, and aligning with them precisely is the difference between a polished, professional feed and one that looks unintentionally broken.

Instagram standardizes all feed content at 1080 pixels wide the height shifts based on the shape you choose.

What Size Is Instagram Post? The Core Dimensions for 2026

For standard feed posts, three shapes are supported.

Each one serves a different visual purpose:

• Square: 1080 × 1080 px (1:1 ratio)
• Portrait / Vertical: 1080 × 1350 px (4:5 ratio) — Instagram's own recommended format
• Landscape / Horizontal: 1080 × 566 px (1.91:1 ratio)

One thing most guides forget to mention: your profile grid displays all posts at a 3:4 preview ratio, not 1:1.

So even a 4:5 vertical image gets its top and bottom edges slightly trimmed in the thumbnail. Keep faces, text, and key subjects in the center of the frame and nothing important gets lost.

Complete Instagram Format and Size Reference Table

Format	Aspect Ratio	Recommended Size	Accepted Files
Square feed post	1:1	1080 × 1080 px	PNG, JPG, BMP
Vertical feed post	4:5	1080 × 1350 px	PNG, JPG, BMP
Horizontal feed post	1.91:1	1080 × 566 px	PNG, JPG, BMP
Carousel	Matches first slide	Up to 20 slides	PNG, JPG, BMP, MP4, MOV
Story	9:16	1080 × 1920 px	PNG, JPG, MP4, MOV
Reel	9:16	1080 × 1920 px	MP4, MOV
Reel cover image	9:16	1080 × 1920 px	PNG, JPG
Profile photo	1:1	320 × 320 px	PNG, JPG
Story ad (single)	9:16	1080 × 1920 px	PNG, JPG, MP4, MOV
Feed image ad	1:1 or 4:5	1080 × 1080 or 1080 × 1350 px	PNG, JPG

Most creators settle on three or four formats and reuse them consistently. There's no benefit to cycling through unusual dimensions it only creates cropping inconsistencies.

Breaking Down Aspect Ratios and Pixel Counts

Two terms come up constantly when discussing Instagram image dimensions. Here's what they actually mean in plain terms.

How Aspect Ratios Work

An aspect ratio describes the proportional relationship between width and height, written as width:height. A 1:1 image is a perfect square.

A 4:5 image is taller than it is wide. A 1.91:1 image is wider than it is tall. A 9:16 image matches the shape of a phone screen held upright the tall, full-screen format used for Stories and Reels.

What Pixels Actually Do

Pixels are the individual dots that together form a digital image. A higher pixel count generally means a sharper, more detailed result.

As reported by TechCrunch, Instagram moved to 1080 pixels of width as its baseline specifically to match the higher-resolution screens on modern smartphones upload something narrower and the platform may stretch it to fit, which softens the image quality noticeably.

Accepted File Formats on Instagram

For photos: PNG, JPG, BMP, and non-animated GIF. For videos: MP4 and MOV. Most phones export photos in one of these formats automatically, so file compatibility rarely becomes an issue unless you're working with unusual source files.

Feed Post Formats Broken Down

Feed posts are the standard uploads that appear on your profile grid. Each shape handles different subject matter naturally.

Square Posts — 1080 × 1080 px The format Instagram originally launched with. Square works well for product photography, symmetrically composed images, and graphic designs where equal dimensions feel intentional.

It doesn't take up as much vertical screen space as portrait during scrolling, but it remains a clean, dependable option.

Portrait Posts — 1080 × 1350 px This is what Instagram recommends. A 4:5 image fills more of a phone screen as someone scrolls, which means they spend a fraction longer viewing it before moving on.

That extra moment often determines whether someone reads the caption or keeps scrolling. For most use cases, this is the strongest default choice.

Landscape Posts — 1080 × 566 px Landscape occupies the least screen space of the three options on mobile.

It earns its place when the image genuinely requires horizontal width wide scenery, group shots, banner-style graphics. Outside those scenarios, you're giving up screen real estate without gaining anything in return.

How the Profile Grid Preview Actually Crops Your Posts

This is the detail most sizing guides get wrong. The profile grid no longer previews posts as squares. It now renders thumbnails in a 3:4 aspect ratio.

What that means practically: if you upload a 4:5 vertical image, a thin sliver is trimmed at the top and bottom in the grid preview even though the full image displays properly when someone taps into the post.

The fix is simple: keep any text, faces, logos, or focal points away from the very edges of vertical posts. If your key content sits in the center of the frame, it survives both the grid thumbnail and the full-view display without adjustment.

Carousel Post Sizing and Layout Behavior

Carousels allow up to 20 photos or videos in a single post. Instagram reads the first slide and applies its dimensions as the default for the sequence.

You have three layout options when uploading:

• All slides match the first slide's ratio
• Each slide keeps its original dimensions
• All slides convert to square

Mixed dimensions sound flexible, but they come with quirks. Instagram automatically pads landscape and square images with extra space above and below, while portrait images run at 4:5.

If you include a video in a mixed carousel, the entire post defaults to portrait orientation regardless of the first slide's format.

Creators who publish carousels regularly tend to crop every slide to the same ratio before uploading. It adds one step to the workflow but gives full control over how each frame appears.

Instagram Story Dimensions and Safe Zone Rules

Stories are built for full-screen vertical display. The correct size is 1080 × 1920 px at a 9:16 aspect ratio. But the dimensions alone don't tell the full story Instagram overlays your profile bar at the top and interaction buttons at the bottom of every Story frame.

Anything placed in those regions risks getting covered. Leave roughly 250 px clear at both the top and bottom for any text, logos, or calls to action.

Square or landscape images can still appear in Stories. You just place them inside the 9:16 canvas and fill the surrounding space with a background color, stickers, or text.

Instagram Reels Size and Display Behavior

Reels follow the same 9:16 format as Stories 1080 × 1920 px. Worth noting: all video uploads on Instagram now display as Reels by default, regardless of how you label them.

How your Reel appears depends on where it's viewed:

• In the main feed: full vertical at 9:16
• On the profile grid: cropped to a 3:4 thumbnail
• Under the Reels tab on your profile: full 9:16

Reel Cover Photo Dimensions

The cover image for a Reel works best at 1080 × 1920 px, matching the video itself. You can select a frame from the video or upload a custom image from your camera roll.

One often-overlooked feature: you can update the cover image on a Reel after it's already been published, without re-uploading the video. Useful for refreshing a thumbnail that no longer fits your profile's visual direction.

Profile Photo Size and Display Quirks

Profile photos display across the platform on your profile, in the Stories tray, in the feed alongside your posts, and in DMs. The ideal upload size is 320 × 320 px at a 1:1 ratio.

Instagram renders all profile photos as circles, so anything near the corners of the square frame gets cropped. Center your subject and leave the edges clear.

Instagram Ad Dimensions vs Organic Post Sizes

Ad dimensions closely mirror organic post sizes but aren't identical. Boosting an existing post keeps its original dimensions.

Creating a fresh ad from scratch uses Instagram's ad-specific specs:

• Story ads (single image or video): 1080 × 1920 px (9:16)
• Carousel Story ads (2–10 cards): 1080 × 1920 px (9:16)
• Feed image ads: 1080 × 1080 px (1:1) or 1080 × 1350 px (4:5)

Instagram frequently recommends higher resolutions for ad placements than for organic posts. Brands running paid campaigns regularly tend to reference Meta's official ad spec documentation rather than going from memory, since file size limits, length caps, and optimal dimensions shift with platform updates.

How to Prevent Instagram From Cropping Your Images

Nearly all cropping problems trace back to the same root cause: uploading at a ratio Instagram doesn't natively support.

A few reliable fixes:

• Upload at one of the four supported feed ratios: 1:1, 4:5, 1.91:1, or 9:16
• When the upload preview defaults to a square crop, tap the expand icon at the bottom-left of the preview to restore the original ratio
• For carousels with mixed content, crop every slide to a consistent ratio before uploading
• Center key visual content within the 3:4 grid safe zone

When the source image is the wrong shape entirely, adding borders is a clean workaround. You preserve the original framing and pad the remaining space with a solid color or texture to hit the required ratio without distorting anything.

Why Mixing Content Formats Benefits Your Reach

Sizing is one part of a broader picture. Instagram's algorithm surfaces content based on individual viewer behavior, so profiles that publish only one format tend to reach a narrower slice of their audience.

Mixing feed posts, carousels, Stories, and Reels puts your content on more surfaces where it can be discovered.

According to data from Statista, Reels consistently achieve the highest reach across post formats on Instagram, making them a key part of any multi-format publishing strategy.

What often gets overlooked is that consistent sizing across formats is what makes a profile feel intentional.

A feed with stretched thumbnails, awkward crops, and mismatched ratios reads as careless even when the underlying content is strong. Format discipline is invisible when done right, and noticeable when it isn't.

Summary

Instagram post sizing comes down to a small set of numbers: 1080 × 1080, 1080 × 1350, and 1080 × 566 for feed posts, plus 1080 × 1920 for Stories and Reels. Match the format, keep key content centered for the 3:4 grid preview, and most cropping issues resolve on their own.

Frequently Asked Questions

What is the optimal size for an Instagram feed post?

Instagram recommends 1080 × 1350 px at a 4:5 aspect ratio for feed posts. Portrait images occupy more vertical screen space, which means viewers spend slightly longer on each post while scrolling giving you a better chance of earning a tap on the caption or a visit to your profile.

What dimensions should an Instagram Story be?

The ideal Story size is 1080 × 1920 px at a 9:16 aspect ratio. This fills the screen without borders or blank space. Leave approximately 250 px clear at the top and bottom to avoid your content being covered by Instagram's interface overlays.

What resolution works best for Instagram Reels?

Reels perform best at 1080 × 1920 px with a 9:16 aspect ratio. Use the same dimensions for your cover image so the thumbnail displays cleanly on both the profile grid and the Reels tab.

Is the Instagram grid 4:5 or 3:4?

The Instagram profile grid previews posts at a 3:4 ratio. Your actual post can still be uploaded at 4:5, 1:1, or 1.91:1 just keep important visual elements centered within the frame so nothing gets clipped in the thumbnail view.

How do I stop Instagram from cropping my photo?

Upload at a natively supported ratio 1:1, 4:5, 1.91:1, or 9:16. If the preview shows your image cropped to a square, tap the expand icon at the bottom-left of the upload screen to revert to the original ratio. For images that don't fit any supported ratio, add borders to pad them into the correct dimensions without distorting the original.