Instagram Aspect Ratios & Sizes (2025 Guide for Posts, Stories & Reels)
When posting images or videos to Instagram through our app, it’s crucial to stick to the platform’s aspect ratio and size requirements. Choosing the right dimensions ensures your content displays properly, avoids cropping, and looks professional.
This updated 2025 guide breaks down everything you need to know — from aspect ratios to pixel dimensions — so your posts, Stories, and Reels always look their best.
📊 Quick Reference: Instagram Aspect Ratios & Sizes (2025)
|
Content Type |
Recommended Aspect Ratio |
Pixel Dimensions (px) |
Notes |
|
Feed Posts (Square) |
1:1 |
1080 x 1080 |
Widely used, safe format |
|
Feed Posts (Portrait) |
4:5 |
1080 x 1350 |
Best for engagement |
|
Feed Posts (Landscape) |
1.91:1 |
1080 x 566 |
Wide format option |
|
Stories |
9:16 |
1080 x 1920 |
Fullscreen format |
|
Reels |
9:16 |
1080 x 1920 |
Same as Stories |
What is an Aspect Ratio?
An aspect ratio represents the relationship between width and height, written as width:height (e.g., 4:5).
To calculate:
width ÷ height = aspect ratio value
Examples:
- 1200 x 1200 → 1:1
- 1200 x 1500 → 0.8 (4:5)
- 1200 x 629 → ~1.91 (landscape)
Instagram enforces these ratios strictly. For example, 1200 x 628 px equals 1.9108 — slightly too wide — and won’t be accepted.
Instagram Feed Post Sizes (Square, Portrait, Landscape)
- Square Posts (1:1): Best at 1080 x 1080 px.
- Portrait Posts (4:5): Best at 1080 x 1350 px (tall format).
- Landscape Posts (1.91:1): Best at 1080 x 566 px.
👉 Pro Tip: Portrait (4:5) posts generally perform best since they use more screen space on mobile feeds.
Instagram Story Dimensions
- Aspect Ratio: 9:16
- Pixel Size: 1080 x 1920 px
- Notes: Stories are designed for fullscreen viewing. Uploads outside this ratio may be cropped or appear with black bars.
Instagram Reels Sizes
- Aspect Ratio: 9:16
- Pixel Size: 1080 x 1920 px
- Range Accepted: Technically 0.01:1 to 10:1, but anything outside 9:16 may crop.
👉 Stick with 9:16 for best playback across devices.
File Size & Quality Requirements
- Max image size: 8MB
- Minimum dimensions: 150 x 150 px (will be scaled up)
- Automatic resizing: Larger images are resized to 1920 px width.
Our app handles this automatically, so your images always comply.
How Our App Handles Display
Inside SocialPost.ai, images may appear square (1:1) in the composer or calendar, but previews reflect the true 4:5 or 9:16 format. What you see on Instagram will always match platform requirements.
FAQs (2025 Updates)
What is the best Instagram post size in 2025?
1080 x 1350 px (portrait, 4:5 ratio) performs best for engagement.
What size should Instagram Reels be?
1080 x 1920 px (9:16). Same as Stories.
Does Instagram crop photos that don’t fit?
Yes. Anything outside 1:1, 4:5, or 1.91:1 will crop or display with borders.
What’s the maximum resolution Instagram allows?
Up to 8MB file size; 1080 x 1920 px is the recommended high-quality standard.
By following these aspect ratios and sizes, you’ll ensure every post, Story, and Reel looks sharp and professional.
👉 Want to skip the hassle? SocialPost.ai automatically resizes, formats, and schedules your content — so you never have to worry about cropping or compression again.