What Is Instagram Post Size? A Clear Breakdown by Format

So what is Instagram post size? It refers to the pixel dimensions and aspect ratio your image or video needs to display correctly.

The standard square post size is 1080×1080 pixels, but landscape, vertical, story, and Reels formats each use different dimensions.

As Wikipedia notes, the 1:1 square ratio is one of the formats most commonly associated with social platforms like Instagram.

Quick Facts: What Is Instagram Post Size at a Glance

Post Type	Pixel Dimensions	Aspect Ratio
Square post	1080 x 1080	1:1
Landscape post	1080 x 566	1.91:1
Vertical post	1080 x 1350	4:5
Story	1080 x 1920	9:16
Reels	1080 x 1920	9:16
Profile picture	320 x 320	1:1

Instagram Post Sizes by Format

There isn't one single "correct" post size on Instagram there are three, and which one you use depends on what the image actually looks like.

Square Post Size (1080 x 1080)

This is the default most people fall back on, and for good reason. At 1080×1080 pixels, a 1:1 ratio, it fits cleanly into Instagram's grid view without any cropping surprises.

According to Wikipedia, Instagram originally only allowed square photos because that matched the iPhone's display width at the time, and only eased that restriction in 2015.

If you're not sure which format to pick, this is the safest one partly for historical reasons, partly because it's just hard to get wrong.

Landscape Post Size (1080 x 566)

Landscape works at 1080×566 pixels, a 1.91:1 ratio. This format makes sense for wide shots a horizon line, a group photo, a restaurant or storefront layout shot flat-on. Outside of those situations, it tends to waste a lot of vertical space in the feed.

Vertical Post Size (1080 x 1350)

Vertical posts use 1080×1350 pixels, a 4:5 ratio. This is worth noting specifically because it takes up more screen space than a square post when someone is scrolling which is part of why a lot of creators default to it now, even outside of fashion or portrait content where it originally made the most sense.

How Instagram Displays Different Sizes in the Feed

Here's where some confusion tends to creep in. Instagram's main grid the one visible on a profile page displays everything as a square thumbnail, regardless of which format you uploaded. A vertical 4:5 post still shows up as a square tile in the grid.

That doesn't mean the image itself gets permanently cropped. Open the post directly, and it displays at its original uploaded ratio.

In practice, this distinction between grid view and post view is the main source of confusion people run into they upload a vertical image, see a square thumbnail on their profile, and assume the image got cut. It didn't. The full version is still there inside the post.

Instagram Story and Reels Sizes

Both formats are full-screen and vertical, but they show up slightly differently depending on where they're viewed.

Instagram Story Size (1080 x 1920)

Stories use a full-screen 1080×1920 pixel format, a 9:16 ratio. Since stories are viewed one at a time, full-screen, there's no grid-view cropping to think about the way there is with feed posts.

Instagram Reels Size (1080 x 1920)

Reels share the same 1080×1920, 9:16 dimensions as stories. Where this gets a little inconsistent is how Reels display in other places in someone's main feed, a Reel often appears at a 4:5 ratio, and in the Reels tab on a profile, the thumbnail shows as 9:16.

The underlying file doesn't change; only the display crop does, depending on where it's being viewed.

Also Read: Game News: eTrueSports

Other Instagram Image Sizes

There's one more size worth knowing, even though it isn't a "post" in the usual sense.

Profile Picture Size (320 x 320)

The profile picture uses a smaller 320×320 pixel square. Because it displays as a circle across the app, it's worth keeping anything important a face, a recognizable figure like a CNBC commentator, or a logo centered rather than near the edges, since the corners get cropped away by the circular mask.

What Happens If Your Image Doesn't Match These Dimensions

Upload something outside these ratios, and Instagram doesn't reject it it adjusts the display automatically, usually by cropping to the closest supported ratio rather than stretching or distorting the image.

In practice, most people notice this the first time they upload a screenshot or a photo straight from their camera roll that wasn't shot with Instagram in mind.

The image still posts. It just might not crop where you'd want it to, and on platforms where account security gets overlooked, small formatting mistakes like this tend to go unnoticed too. The safer approach, in most cases, is sizing the image yourself beforehand rather than letting Instagram decide.

Video Post Size Guidelines

Video follows roughly the same rules as images, with a couple of extra limits to keep in mind.

Video Dimensions and Aspect Ratio

Video posts follow the same dimension ranges as image posts anywhere from 1.91:1 (landscape) to 4:5 (vertical) for feed videos, and 9:16 for stories and Reels.

Video Length and File Size Limits

Feed video posts can run up to 60 seconds, with a file size limit of 4GB. Teams managing multiple accounts commonly report that file size becomes the more frequent issue a video well under the time limit can still get rejected for upload if it's poorly compressed.

Also Read: Feedbuzzard Advertising

Conclusion

Instagram post size depends on format. Square (1080×1080) is the safest default, with landscape, vertical, story, and Reels each using different dimensions. When in doubt, size the image yourself before uploading.

Frequently Asked Questions

What is the best size for an Instagram post?

There's no single best size it depends on the image. Square (1080×1080) is the most universally safe choice and avoids unexpected cropping in the grid view.

Are Instagram post sizes different for square, landscape, and vertical posts?

Yes. Square is 1080×1080 (1:1), landscape is 1080×566 (1.91:1), and vertical is 1080×1350 (4:5). Each serves a different kind of image.

What happens if I upload an image in the wrong size?

Instagram automatically crops it to fit the closest supported ratio. It won't get rejected, but the crop may not land where you'd prefer.

Is the Instagram Story size the same as the Reels size?

Yes, both use 1080×1920 (9:16). Display can vary slightly depending on where the Reel appears — feed, grid, or Reels tab.

What size should my Instagram profile picture be?

320×320 pixels, displayed as a circle. Keep key details centered, since the edges get cropped by the circular frame.