The Ultimate Instagram Post Size Guide: Dimensions, Ratios, and the New Grid Rules

Whether you’re a seasoned creator, a brand manager, or just someone trying to keep your grid looking crisp, nothing halts a scroll faster than an awkwardly cropped photo or a pixelated video.

Instagram supports a variety of layouts, but getting the sizes right can feel like hitting a moving target—especially with updates like the platform’s shift toward 3:4 portrait grid previews.

This complete, no-fluff guide breaks down every exact dimension, aspect ratio, and “safe zone” you need to know to make your content look elite.

1. Instagram Feed Posts (Single Images & Carousels)

When it comes to the standard feed, the golden rule of resolution is simple: always design at a width of 1080 pixels. Instagram downscales anything wider, and images smaller than 320 pixels will be stretched into a blurry mess.

Choose your format based on how much screen real estate you want to capture:

• Portrait (4:5 Ratio) — Recommended
  • Dimensions: $1080 times 1350$ px
  • Why use it: This is the undisputed king of feed posts. It takes up the maximum vertical space allowed in a standard scroll, forcing users to pause longer on your image or carousel.
• Tall Portrait (3:4 Ratio)
  • Dimensions: $1080 times 1440$ px
  • Why use it: Perfect if you prefer posting natively in-app without your image being modified by the grid view. (Note: If you use a scheduling tool via API, stick to 4:5, as some schedulers don’t accept 3:4 yet.)
• Square (1:1 Ratio)
  • Dimensions: $1080 times 1080$ px
  • Why use it: The classic shape. While it doesn’t grab as much attention as portrait, it’s still reliable for uniform product catalogs or cross-posting from other networks.
• Landscape (1.91:1 Ratio)
  • Dimensions: $1080 times 566$ px
  • Why use it: Use this only when you have a genuinely wide landscape photo, cinematic travel shot, or dashboard screenshot that would lose its context if cropped. Otherwise, it leaves a lot of empty white space.

Crucial Carousel Rule: If you are building a multi-slide carousel, every single slide must share the exact same aspect ratio. Pick your format (ideally $1080 times 1350$ px) before you start designing.

2. Stories and Reels (9:16 Full-Screen Vertical)

Immersive, full-screen vertical video and imagery rule the modern social landscape. Both Stories and Reels share the exact same canvas requirements.

• Dimensions: $1080 times 1920$ px
• Aspect Ratio: 9:16

Mastering the “Safe Zones”

Because Instagram overlays interactive elements—like your profile handle, audio track names, like/comment buttons, and caption text—right on top of your video, you cannot design blindly to the edge.

• For Stories: Keep core text and elements within the central frame, leaving roughly 250 pixels of padding at the top and bottom free of crucial information.
• For Reels: Keep faces, primary subtitles, and action points centered. Your Reels play full-screen, but when shared to your main profile grid, they get previewed in a cropped container. Keep the main focal point dead-center so it doesn’t get chopped off in the grid.

3. Profile Pictures and Highlight Covers

First impressions happen fast. Make sure your branding elements fit the frame:

• Profile Picture: Upload at a minimum of $320 times 320$ px (1:1 ratio). Remember that Instagram crops profile photos into a circle, so center your logo or face and leave a 20% breathing room buffer around the edges.
• Highlight Covers: Design these as $1080 times 1920$ px Story slides (or $1080 times 1080$ px squares). Keep your icon or text strictly centered so the circular container doesn’t slice off your design.

Quick Summary Cheat Sheet

| Post Type | Ideal Dimensions (Pixels) | Aspect Ratio |
| :— | :— | :— |
| Feed Portrait (Best Choice) | $1080 times 1350$ | 4:5 |
| Feed Square | $1080 times 1080$ | 1:1 |
| Feed Landscape | $1080 times 566$ | 1.91:1 |
| Stories & Reels | $1080 times 1920$ | 9:16 |
| Profile Picture | $320 times 320$ (minimum) | 1:1 |