Instagram Post Size Guide 2026: Every Dimension & Aspect Ratio You Need

Getting your instagram post size right determines whether your image looks crisp and perfectly framed or cropped, blurry, and oddly spaced.

This guide covers the exact instagram image dimensions for every format: feed photos, carousels, Stories, Reels, and profile pictures, so every upload displays precisely the way you intended.

Quick Reference: All Instagram Dimensions at a Glance (2026)

Post Type	Aspect Ratio	Recommended Size
Square Feed Post	1:1	1080 x 1080 px
Portrait Feed Post	4:5	1080 x 1350 px
Landscape Feed Post	1.91:1	1080 x 566 px
Stories	9:16	1080 x 1920 px
Reels	9:16	1080 x 1920 px
Reels Cover/Thumbnail	9:16	1080 x 1920 px
Profile Photo	1:1	320 x 320 px

How Instagram Post Size Actually Works

Two terms come up constantly when discussing instagram post size: aspect ratio and pixels. Neither is complicated once you understand what each one actually means.

Aspect Ratio: The Shape of Your Image

An instagram aspect ratio is simply the ratio of width to height it describes the shape of an image, not its file size or quality.

According to Wikipedia's overview of image aspect ratios, it is expressed as width:height, so a 1:1 ratio produces a perfect square, 4:5 creates a taller-than-wide portrait, and 9:16 is the tall, narrow shape that fills a phone screen from edge to edge.

What many people miss: aspect ratio and pixel count are entirely separate things. A 4:5 image can be 1080 x 1350 px or 540 x 675 px — the shape is identical, but the resolution is not.

Pixels and Why They Matter for Instagram Photo Resolution

Pixels are the individual dots that construct a digital image. More pixels generally equals more detail and a sharper result. Instagram recommends uploading at 1080 pixels wide because that is the maximum the platform displays.

Upload wider than that and Instagram compresses it down. Upload narrower and the image may appear soft or stretched on modern screens.

In practice, sticking to exactly 1080 px wide delivers the cleanest output every time there is no advantage to going higher for standard posts.

Supported File Formats on Instagram

For photos, Instagram accepts JPG, PNG, BMP, and non-animated GIF files. For videos, MP4 and MOV are the two supported formats.

The maximum video file size is 4 GB. For photos, Instagram has no publicly stated hard cap, though files exceeding 8 MB can sometimes trigger quality compression during upload.

Instagram Feed Post Dimensions Explained

Instagram opened up beyond square-only posts in 2015, introducing landscape and portrait formats.

As reported by TechCrunch when the platform first introduced landscape and portrait formats, nearly one in five photos or videos posted to Instagram at the time were not in square format a key reason the change was made. Today there are three feed post options, each suited to different content types.

Square Post (1:1) — 1080 x 1080 px

Square posts remain the most practical choice for product photography, branded graphics, and centered compositions.

They sit cleanly inside the profile grid and require no extra cropping consideration. If you are unsure which format to choose, a square post is still the most straightforward default.

Portrait Post (4:5) — 1080 x 1350 px

Portrait is generally treated as Instagram's go-to recommended feed format. It occupies more vertical screen space as someone scrolls, which tends to hold attention slightly longer.

Creators who post consistently often find portrait works best for people-centered photography and immersive scene-setting images.

One important nuance: the profile grid previews content at a 3:4 ratio — a tighter vertical crop than the 4:5 format itself. Keep faces, logos, and text centered to prevent key elements from being clipped in grid view.

Landscape Post (1.91:1) — 1080 x 566 px

Landscape suits wide-angle shots, aerial photography, or any image where horizontal space is the point.

Because it takes up less vertical height in the feed, viewers scroll past it faster worth factoring in when using the format for attention-demanding content.

What Happens If You Upload the Wrong Size?

Instagram accepts images outside its preferred aspect ratios but auto-crops them to the nearest supported ratio. That crop cannot be manually adjusted after the fact. If your image falls outside the 1.91:1 to 4:5 range, Instagram forces it into the closest accepted dimensions.

The fix is simple: crop the image yourself before uploading. That way you control exactly what appears — and what gets left out.

Instagram Carousel Post Sizing: What You Need to Know

Carousels follow the same dimension options as single feed posts, but introduce a few extra variables when you are mixing multiple images in one post.

How Carousel Sizing Is Determined

Instagram takes its sizing cue from the first image in the carousel.

At upload, you can choose one of three display options:

Match all images to the first image's dimensions
Display each image in its original dimensions (mixed)
Convert all images to square

Mixing Dimensions Inside a Carousel

Opting for mixed dimensions allows creative variety, but it introduces some quirks. Landscape and square images get spacing added above and below.

Portrait images display at 4:5. If a video is included anywhere in the carousel, Instagram overrides everything and switches all slides to portrait even if the first image was landscape or square.

One detail worth knowing: if Instagram auto-crops any carousel image during upload, that crop is locked in and cannot be changed afterward.

The Cleanest Approach to Carousel Sizing

Crop all images to matching dimensions before uploading. Consistent sizing eliminates auto-cropping surprises and makes the carousel feel more deliberate.

Teams posting carousels regularly often default to 1080 x 1350 px across all slides for exactly this reason.

Instagram Story Dimensions and Safe Zones

Stories are built for full-screen vertical viewing on a phone held upright. The format fills the entire display, which is why precise instagram story dimensions matter more visually here than anywhere else.

Recommended Story Size: 1080 x 1920 px (9:16)

This is the exact size that fills a phone screen without borders or letterboxing. Both photos and videos should be prepared at these dimensions before posting to Stories.

Safe Zones: Where to Keep Your Key Content

Instagram overlays your profile name at the top and action buttons at the bottom of every Story frame. Roughly 250 pixels at both the top and bottom of your image are likely to be obscured by these UI elements.

Keep all critical content text, logos, faces within the central portion of the frame, roughly between 250 px and 1670 px from the top if you are working in pixel terms.

Posting Non-Vertical Images to Stories

If you only have a square or landscape image, you can still post it as a Story. Instagram centers it on the 9:16 canvas and leaves empty space above and below.

That space is genuinely useful it is a natural area for text overlays, stickers, or GIFs, which can make the post feel intentional rather than incorrectly sized.

Instagram Reel Size and Thumbnail Dimensions

All video posts on Instagram currently appear as Reels. The format mirrors the same vertical structure as Stories.

Recommended Reel Size: 1080 x 1920 px (9:16)

This fills the screen when someone watches the Reel in full. Shoot and edit at this size before uploading do not rely on Instagram to handle conversion from landscape or square video. The results are rarely clean.

How a Reel Appears Across Different Parts of the App

The same Reel looks different depending on where it is viewed:

Tapped or in Explore: Full 9:16 display
Profile grid alongside photos: Cropped to 3:4
Reels tab on a profile: Full 9:16

The 3:4 grid crop is worth planning for. If your Reel thumbnail has text or a face near the frame edges, it will likely be cut off in profile grid view.

Reel Cover Photo Size — 1080 x 1920 px

The cover photo for a Reel should match the video itself at 1080 x 1920 px. You can select a frame from the video or upload a custom image from your camera roll.

The cover only appears in profile grid view not while the Reel is playing.You can update a Reel's cover photo at any time after publishing. No re-upload required.

Instagram Profile Picture Size

Your Instagram profile picture is the first visual element people notice getting the size right ensures it looks sharp everywhere it appears.

Recommended dimensions: 320 x 320 px (1:1)

Your profile photo surfaces across multiple areas in the app your profile page, the Stories tray, beside feed posts, and inside DMs. Instagram always displays it as a circle, so anything near the corners of your square image gets automatically cropped out.

Center your subject and leave clear margin around the edges. A face or logo that fills the full 320 x 320 frame will have its corners visibly clipped in the circular display.

The 3:4 Grid Rule: The Detail Most People Miss

This is the point that trips people up most often. Your post can be 4:5, 1:1, or 1.91:1. But your profile grid previews every post at a 3:4 ratio a tighter vertical crop than the 4:5 post format itself.

That means a portrait post (1080 x 1350 px) gets clipped at the top and bottom when it appears as a grid thumbnail. A square post shows with space above and below in the grid. A landscape post appears quite wide relative to its height.

The one rule that works across all formats: keep your most important visual element centered. That single habit protects your content from the 3:4 grid crop regardless of which format you post in.

Instagram Ad Sizes: A Quick Overview

Ad sizing works differently depending on whether you are boosting an existing post or building a new ad from scratch.

Boosted posts retain their original dimensions no separate sizing needed.

For new ad creatives built specifically for a campaign, Instagram recommends:

Single image or video story ads: 1080 x 1920 px
Carousel story ads (2–10 cards): 1080 x 1920 px

Each ad format has its own requirements for aspect ratio, file type, and resolution. Meta's official ads guide is the definitive reference for full and current ad specifications.

Conclusion

Match your content to the right format: 4:5 for feed posts, 9:16 for Stories and Reels, 1:1 for profile photos.

No single size works for everything. When in doubt, portrait (1080 x 1350 px) is the safest default for feed content it is the format Instagram itself tends to favor.

Frequently Asked Question

What is the best size for an Instagram post?

For feed posts, 1080 x 1350 px (4:5 portrait) is the recommended default. It occupies more vertical screen space in the feed and performs well across most photo and graphic formats.

What size are Instagram Stories?

Stories should be 1080 x 1920 px at a 9:16 aspect ratio. Leave approximately 250 pixels of clear space at both the top and bottom to prevent content from being covered by Instagram's UI overlays.

What is the difference between 4:5 and 3:4 on Instagram?

Your feed post uploads at 4:5 (1080 x 1350 px). Your profile grid previews that same post at 3:4 a tighter crop. Keep key visuals centered so the grid thumbnail does not cut off anything important.

What happens if I upload the wrong size on Instagram?

Instagram auto-crops the image to the nearest supported aspect ratio. That crop cannot be adjusted after upload, which is why cropping manually beforehand gives you better control over the final result.

Can I change a Reel's cover photo after posting?

Yes. Tap the menu on your published Reel, select Edit cover, then choose a new frame from the video or upload a custom image. The change applies to your profile grid without requiring a full re-upload.