What Size Is an Instagram Post — And Why Getting It Right Changes Everything

If you have ever uploaded a photo to Instagram and watched it come out awkwardly cropped, you have already experienced why knowing what size is an Instagram post matters more than most people expect. Instagram works with a fixed set of accepted dimensions, and hitting them correctly is the difference between a polished post and one that looks broken before anyone even reads the caption.

The platform standardizes feed posts at 1080 pixels wide, with the height varying depending on the shape you choose — and with the platform now surpassing 3 billion monthly active users, according to TechCrunch, getting your visuals right has never had higher stakes.

Instagram Post Dimensions — Every Format in One Place

Before diving into individual formats, here is a single reference table covering every Instagram visual type. Most people only use three or four of these regularly, but having them all together saves time every single time you create content.

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

Most creators pin a reference like this and cycle through the same three or four sizes across every post. There is no real advantage to using unusual dimensions.

Breaking Down Aspect Ratios and Instagram Image Dimensions

Two terms appear constantly when talking about Instagram image dimensions — aspect ratio and pixels. They sound technical but are straightforward once you see what they actually describe.

What an Aspect Ratio Actually Means

An aspect ratio is simply the relationship between width and height, written as width:height. A 1:1 ratio is a perfect square. A 4:5 ratio is taller than it is wide. A 1.91:1 ratio is wider than it is tall. A 9:16 ratio is the full-screen vertical shape your phone creates when you hold it upright — the standard for Stories and Reels.

What Pixels Control

Pixels are the individual dots that form a digital image. A higher pixel count generally produces a sharper result. Instagram sets 1080 pixels as its standard width baseline. Uploading anything narrower risks the platform stretching the image to compensate, which softens the overall quality.

File Formats Instagram Accepts

For photos: PNG, JPG, BMP, and non-animated GIF. For videos: MP4 and MOV. Most phones already export in these formats by default, so this only becomes a problem when working from unusual source files or professional editing software.

Instagram Feed Post Sizes Explained

Feed posts are the standard photo or video uploads that appear on your profile grid. Three shapes are supported, and each one serves a different purpose.

Square Posts — 1080 x 1080 px

The original Instagram format. Square works well for centered subjects, product photography, and graphic designs where symmetry is part of the composition. It is not a bad choice — it simply fills less vertical screen space than a portrait post, which is a real consideration when competing for attention in a fast-moving feed.

Portrait Posts — 1080 x 1350 px

This is the format Instagram officially recommends for feed content. A 4:5 vertical image occupies more of the phone screen as someone scrolls, which means viewers spend a fraction longer passing over it. That extra moment is often what prompts someone to actually stop, look at the image, and read the caption.

Landscape Posts — 1080 x 566 px

Landscape is the smallest of the three formats in terms of on-screen presence. It is the right call when the image genuinely requires horizontal space — wide outdoor scenes, group shots, or banner-style graphics. Outside those cases, you are simply trading away screen real estate without a clear reason.

How the Instagram Profile Grid Actually Works Now

This is the detail most older articles get wrong. The Instagram profile grid no longer displays posts as squares. As reported by The Verge, Instagram head Adam Mosseri confirmed the grid would shift from squares to rectangles, stating that rectangles do a better job of showcasing the photos and videos people actually upload.

The grid now previews content in a 3:4 aspect ratio. What that means in practice: if you upload a 4:5 vertical image, a small sliver of the top and bottom gets trimmed in the grid thumbnail — even though the full image appears completely intact when someone taps on the post.

The practical fix is simple: keep any important text, faces, logos, or focal points away from the very top and bottom edges of vertical images. Position them centrally and they remain visible in both the grid preview and the full post view.

Instagram Carousel Post Size

Carousels allow you to publish up to 20 photos or videos in a single post. Instagram takes its size cue from the first slide and applies it across the rest of the carousel.

There are three layout options when posting:

• All slides match the dimensions of the first slide
• Slides retain their individual original dimensions
• All slides are converted to square

Mixed dimensions might seem like a flexible option, but it comes with a specific quirk: Instagram automatically adds padding above and below landscape and square images, while portrait images display at the full 4:5 ratio. If your carousel includes video, the entire post switches to portrait orientation regardless of what your first slide looks like.

Teams that publish carousels consistently tend to crop every slide to a matching ratio before uploading. It adds a small step to the workflow but gives you full control over exactly how each frame is presented.

Instagram Story Size

Stories are designed for full-screen vertical viewing. The correct dimensions are 1080 x 1920 px at a 9:16 Instagram aspect ratio.What the numbers alone do not tell you: Instagram overlays your profile information at the top of every Story and places interaction buttons at the bottom.

Any content placed in those zones risks being hidden. A reliable rule is to keep at least 250 px of clear space at both the top and bottom edges for any text, branding, or calls to action.

Square or horizontal images can still be used in Stories — you simply place them within the 9:16 canvas and fill the empty space with stickers, text, or a solid background color.

Instagram Reels Dimensions

Reels use the same 9:16 format as Stories — 1080 x 1920 px. Worth flagging: Instagram now treats all video uploads as Reels, including videos you intended as standard feed posts.

How a Reel appears depends on the context in which it is being viewed:

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

Reel Cover and Thumbnail Dimensions

The cover image for a Reel performs best at the same 1080 x 1920 px dimensions as the video itself. You can either select a frame from within the video or upload a custom cover from your camera roll.

One detail worth knowing: you can change the cover image after a Reel is already live. If an older Reel's thumbnail no longer fits your profile aesthetic, you can swap it out without re-uploading the video itself.

Instagram Profile Photo Size

Profile photos are small, but they appear in a lot of places — your profile page, the Stories tray, the feed when you post, and your direct message conversations. The correct dimensions are 320 x 320 px at a 1:1 ratio.

Instagram displays profile photos as circles. Anything near the corners of the original square gets cropped automatically. Center your face, logo, or subject and leave the edges relatively clear to make sure nothing important disappears.

Instagram Ad Dimensions

Ad sizes follow a similar pattern to organic posts but are not identical. If you boost an existing post, it keeps its original dimensions. If you build an ad from scratch, you will use Instagram's dedicated ad specifications.

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

Instagram tends to recommend higher resolutions for paid placements than for organic content. Brands running ads regularly are better served by referencing Meta's official ad spec sheet rather than going from memory, since requirements shift as campaign objectives and placement options change.

How to Stop Instagram From Cropping Your Photos

Most cropping problems come down to the same root cause: uploading at a ratio Instagram does not natively support. A few straightforward fixes:

• Upload at one of the four supported feed ratios: 1:1, 4:5, 1.91:1, or 9:16
• If the upload preview snaps to a square by default, tap the two-arrow expand icon in the lower left to restore the original ratio
• For carousels with mixed content, manually crop every slide to a consistent ratio before uploading
• Keep essential visual content within the 3:4 safe zone so nothing disappears on the grid preview

If your source image is a ratio that Instagram does not support, adding borders is a clean workaround. You preserve your 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 Matters More Than Sizing Alone

Sizing is one part of a larger equation. Instagram surfaces content based on what individual viewers engage with most, which means profiles that publish only one format tend to reach a narrower audience over time. Mixing feed posts, carousels, Stories, and Reels gives your content more places to appear and more types of viewers to reach.

What often goes unnoticed is that consistent sizing across these formats is what makes a profile feel cohesive and intentional. A feed full of stretched thumbnails, inconsistent crops, and mismatched ratios reads as careless — even when the actual content is strong. The sizing is not separate from the brand impression; it is part of it.

Summary

Instagram photo resolution and sizing comes down to a handful of numbers: 1080 x 1080, 1080 x 1350, and 1080 x 566 for feed posts, plus 1080 x 1920 for both Stories and Reels. Match the format, keep key content centered within the 3:4 grid preview zone, and most cropping problems resolve themselves before they happen.

Frequently Asked Questions

What is the best size for an Instagram feed post?

Instagram recommends 1080 x 1350 px at a 4:5 aspect ratio for feed posts. Vertical images take up more screen space than square or landscape options, which generally results in viewers spending slightly longer on the post as they scroll through their feed.

What size should an Instagram Story be?

The correct Story size is 1080 x 1920 px at a 9:16 aspect ratio. This fills the screen cleanly without borders or cropping. Leave approximately 250 px of clear space at the top and bottom to avoid your content being covered by the profile bar and interaction buttons.

What size should an Instagram Reel be?

Reels work best at 1080 x 1920 px with a 9:16 aspect ratio. Use the same dimensions for your Reel cover image so the thumbnail sits cleanly on your profile grid and within the Reels tab.

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

The Instagram profile grid previews posts in a 3:4 ratio. Your full post can still be 4:5, 1:1, or 1.91:1 — but keep important visual elements centered within the 3:4 zone to avoid anything being trimmed in the grid thumbnail.

How do I stop Instagram from cropping my picture?

Upload at a supported aspect ratio — 1:1, 4:5, 1.91:1, or 9:16. If the preview defaults to square, tap the expand icon at the bottom left of the preview screen to switch back to the image's original ratio.