MidJourney Aspect Ratios: How to Optimize Images for Instagram, Facebook, Twitter, and LinkedIn

I’ve been spending some serious time exploring MidJourney’s capabilities—and I just learned something that completely leveled up how I approach blog visuals: aspect ratio optimization for different platforms. It makes your image perfectly tailored for Instagram, Facebook, Twitter, and LinkedIn.

In this post, I’ll share what I’ve discovered about customizing aspect ratios using MidJourney, so your images not only look good—but look perfect everywhere they’re posted. 

Why Optimization Matters 

You’ve created stunning images, but when you post them… something’s off. Maybe the crop is awkward, or the resolution feels fuzzy. That’s because each platform has its own image specs—dimensions, file sizes, and aspect ratios—that affect how your content is displayed.

Let’s break it down by platform:

 Instagram

Instagram is all about aesthetics. Here’s what you need to know:

• Profile Picture: 320 x 320 pixels → Aspect Ratio 1:1

• Post Image:

  • Portrait: 1080 x 1350 → 4:5

  • Square: 1080 x 1080 → 1:1

  • Landscape: 1080 x 566 → 1.91:1

• Story Image: 1080 x 1920 → 9:16

Sample MidJourney prompt: /imagine inspirational quote Stories for Instagram in modern style and vibrant colors --ar 9:16




 Facebook

Facebook supports a variety of formats. Here’s the cheat sheet:

• Profile Picture: 170 x 170 → 1:1

• Cover Photo: 820 x 312 → 41:26

• Shared Image: 1200 x 630 → 12:6.3

Sample MidJourney prompt: /imagine cute puppy --ar 12:6




 Twitter

Twitter is fast-paced, and your visuals need to keep up:

• Profile Picture: 400 x 400 → 1:1

• Header Photo: 1500 x 500 → 3:1

• In-Stream Photo: 1024 x 512 → 2:1

Sample MidJourney prompt: /imagine header photo for Twitter with black background and puppies --ar 3:1

 LinkedIn

Professional, polished, and precise—LinkedIn demands clean visuals:

• Profile Picture: 400 x 400 → 1:1

• Background Photo: 1584 x 396 → 4:1

• Shared Image: 1200 x 627 → 2:1

Sample MidJourney prompt: /imagine LinkedIn background photo in red and pink with text : MidJourney Pro --ar 4:1




Crafting the Perfect Prompt 

So, to optimize images for different platforms, use the –ar (or –aspect) parameter to change the aspect ratio of the generated image. It is typically expressed as two numbers separated by a colon, such as 7:4 or 4:3.

To find the aspect ratio, divide the width (1500) by the height (500) and simplify the fraction. The correct aspect ratio of a Twitter Header Photo is 3:1.

Once you know the aspect ratio you need, it’s all about combining the right format + content + style in your prompt.

Be as clear as possible about:

• Platform
• Purpose (post, header, story, etc.)
• Visual theme (colors, layout, mood)
• Text (if any)

Quick Reference: Aspect Ratios by Platform

Platform	Use	Dimensions (px)	Aspect Ratio
Instagram	Story	1080 × 1920	9:16
Facebook	Shared Image	1200 × 630	12:6.3
Twitter	Header Photo	1500 × 500	3:1
LinkedIn	Background Photo	1584 × 396	4:1