Instagram Post Sizes Have Changed: Here Is What You Need to Know in 2026

If you have noticed your Instagram content looking slightly off lately, or you are wondering why some posts seem to take up more screen space than others, you are not imagining it. Instagram updated its post dimensions, and if you are still designing to the old specs, your content may not be showing up the way you intended.

Here is everything you need to know, plus some strategic advice on how the best brands are using post size as a creative tool.

What Changed: Old Size vs New Size

For years, the go-to Instagram post size for feed content was 1080 x 1350px at a 4:5 aspect ratio. It was the sweet spot — taller than a square, which meant more screen real estate, but still supported across all placements.

In 2026, Instagram now supports a taller format: 1080 x 1440px at a 3:4 aspect ratio.

This change happened alongside Instagram's broader shift away from the classic square grid. The profile grid now previews posts in a 3:4 rectangular format, which means if you are still posting at 4:5, your images may appear slightly cropped or off-centre in your profile grid view.

Here is a quick reference for the formats that matter most right now:

For Portrait (new)1080 x 1440px3:4 Best for: Feed posts, grid-friendly

Portrait (classic)1080 x 1350px 4:5 Best for: Still works, design carefully

Square 1080 x 1080px 1:1 Best for: Infographics, product shots

Landscape 1080 x 566px 1.91:1 Best for: Wide shots, pattern interruption

Stories and Reels 1080 x 1920px 9:16 Best for: Full screen vertical

Why Does This Matter?

It comes down to screen real estate. The more vertical space your post takes up on someone's phone screen, the harder it is to scroll past. Taller posts command more attention, which is why Instagram's own data has consistently shown that portrait format outperforms square for reach and engagement when content quality is equal.

The shift to a 3:4 grid also means that posts designed at 4:5 may have their sides slightly cropped in the profile preview. It is not a dealbreaker, but it is worth being aware of — particularly if you have text, faces, or key visual elements close to the edges of your frame.

The practical advice: start designing to 1080 x 1440px for feed posts going forward. If you are still using 4:5, leave generous padding around anything important so it survives the grid crop.

What Instagram post size should you use in 2026?

Here is where it gets interesting. While most brands are all moving toward the same tall portrait format, the smartest creators are actually playing with size deliberately — and using it as a tool to break the pattern.

When every post in a niche looks the same size and the same shape, a single landscape post or an unexpected square drops into the feed and stops the scroll. Not because of the content itself, but purely because the shape is different to everything around it.

Top creators have been doing this for a while. Dropping a landscape image into a portrait-heavy feed creates a visual disruption that earns attention before the viewer has even processed what the post is about. It is essentially a scroll-stopper built into the format itself.

Our advice: do not lock yourself into one size and post that way forever. Experiment with all three formats — portrait, square, and landscape — and pay attention to which sizes get the most initial engagement in your specific niche. The answer might surprise you.

What This Means for Your Brand Content

If you are a brand creating your own content, the immediate action is straightforward: update your design templates to 1080 x 1440px and give your photographer or designer a heads up that the framing needs to account for a slightly taller crop.

If you are working with a content agency or social media agency, make sure they are across the updated specs, particularly for anything going into your profile grid, where the 3:4 crop is now the default view.

And if you want to start using size more intentionally as a creative strategy, take a scroll through your top-performing competitors and notice what formats they are using. Then try something different.

At The Meaningful Social Club, staying across platform changes like this is part of how we make sure our clients' content is always set up to perform. If you want a team who handles the strategy, the production, and the technical details so you do not have to, find out more about our content creation packages and social media management packages.