Instagram Aspect Ratios: The Complete Guide (1:1, 4:5, 9:16)
Every Instagram post has an aspect ratio — the relationship between its width and height. Choose the right one and your content fills the screen at the right size. Choose the wrong one and Instagram crops your image, often in ways you didn’t intend.
Here’s everything you need to know.
Instagram Aspect Ratios at a Glance
| Format | Aspect Ratio | Dimensions |
|---|---|---|
| Square feed post | 1:1 | 1080 × 1080 px |
| Portrait feed post | 4:5 | 1080 × 1350 px |
| Landscape feed post | 1.91:1 | 1080 × 566 px |
| Stories | 9:16 | 1080 × 1920 px |
| Reels | 9:16 | 1080 × 1920 px |
| Profile grid thumbnail | 1:1 | 161 × 161 px (display) |
Square: 1:1
The classic Instagram ratio. Square posts measure 1080 × 1080 pixels and fill the profile grid cleanly.
When to use it: when your subject is centered and symmetrical, when you want a consistent grid look, or when your content was designed as a square (like most Canva templates). Square is the safest choice if you’re not sure — it never gets cropped.
Limitation: square takes up less vertical space in the feed than portrait. You get less screen real estate, which can mean less stopping power as someone scrolls.
Portrait: 4:5
Portrait posts measure 1080 × 1350 pixels — taller than they are wide. In the feed, this ratio takes up significantly more screen space than square, which tends to hold attention longer.
When to use it: for most feed posts where you want maximum visibility. 4:5 is especially effective for food, fashion, lifestyle, and portrait photography. If you want one ratio to default to for feed content, this is it.
Grid note: portrait posts appear as 1:1 squares in your profile grid — they’re automatically center-cropped. Make sure the important part of your image is vertically centered, otherwise your grid thumbnail will be cropped off in a way that doesn’t represent the full photo.
Landscape: 1.91:1
Landscape posts measure 1080 × 566 pixels — wider than they are tall. In the feed, landscape posts take up the least vertical space of any format.
When to use it: wide shots, panoramas, and cinematic compositions where the horizontal width is essential to the image. It’s the least common feed format for good reason — it takes up less space and may reduce engagement.
Grid note: landscape posts appear as 1:1 squares in your profile grid, cropped to the center. The sides of a landscape image will be cut off.
Stories and Reels: 9:16
Stories and Reels use a 9:16 ratio (1080 × 1920 px) — full-screen vertical. This is the native mobile format: it fills the screen edge to edge.
When to use it: all Stories and Reels content. If you’re repurposing a feed post as a Story, leave space at the top and bottom of the 9:16 frame (about 250 px each side) to avoid your content being covered by UI elements.
Carousels and Aspect Ratios
For carousels, the first slide sets the aspect ratio for the entire post. Every subsequent slide is displayed at the same ratio — if a later slide has different proportions, Instagram crops it to match.
This means: decide your carousel ratio before you design any slide, and design all slides to that ratio from the start.
The best ratio for carousels is 4:5. It maximizes screen space in the feed, and the larger format makes each slide feel more immersive as people swipe through.
How Aspect Ratios Affect Your Profile Grid
Your profile grid always shows a 1:1 square thumbnail for every post, regardless of the actual aspect ratio. This has a few practical implications:
- Portrait posts (4:5) are cropped to a square centered on the middle of the image. Shoot with vertical center-weighting in mind.
- Landscape posts (1.91:1) are cropped to a square from the center. You’ll lose the left and right edges.
- Square posts (1:1) show exactly as-is — no cropping.
If you want full control over how your grid looks, mixing square and portrait posts in the same grid can create an inconsistent look. Many creators standardize on one ratio — usually 4:5 or 1:1 — and stick to it across all feed content.
Preview Your Ratios Before You Post
The best way to avoid grid surprises is to see how your posts look together before they go live. With PlanYourFeed, you can upload your images and preview them in a real-time grid — including how portrait and square posts look side by side and how carousel covers fit with the rest of your feed. Free, no Instagram login required.
Frequently Asked Questions
What aspect ratios does Instagram support? Square (1:1), portrait (4:5), landscape (1.91:1) for feed posts; 9:16 for Stories and Reels.
What is the best aspect ratio for Instagram feed posts? 4:5 portrait takes up the most vertical space in the feed, which tends to increase engagement. Square 1:1 is the classic and looks clean in the profile grid.
What is the best aspect ratio for Instagram carousels? 4:5 portrait — it maximizes screen space. All slides in a carousel must use the same ratio, so the first slide determines the format for the whole post.
What aspect ratio are Instagram Stories and Reels? 9:16 vertical (1080 × 1920 px) — full-screen mobile format.
What happens if I upload the wrong aspect ratio to Instagram? Instagram crops the image to fit. You lose control of the crop, so it’s better to prepare images at the correct ratio upfront.
Do all posts in a carousel need the same aspect ratio? Yes. The first slide sets the ratio for the entire carousel. Subsequent slides with different proportions are automatically cropped to match.