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The Challenge
Instagram supports multiple aspect ratios but portrait 1080×1350 (4:5) takes the most screen space in the feed, driving higher engagement. Uploading images wider than 1080px triggers Instagram's compression. Wrong aspect ratios get cropped unpredictably on the profile grid, which now displays in 3:4 format since 2026.
Why 1080×1350 is the best Instagram post size
Portrait posts at 1080×1350 pixels (4:5 ratio) occupy the most screen space in the Instagram feed, making them harder to scroll past. This drives higher engagement than square (1:1) or landscape (16:9) formats. Instagram downscales anything wider than 1080 pixels and upscales anything below 320 pixels — both reduce quality. Since 2026, Instagram's profile grid displays posts in a taller 3:4 crop (1012×1350), making the 4:5 format the best choice for both feed appearance and grid consistency.
2026 Instagram grid change
- Instagram's profile grid now displays posts in 3:4 ratio instead of 1:1 square
- Square images (1080×1080) will be cropped vertically on the grid
- Portrait 1080×1350 (4:5) posts display correctly in both feed and grid
- Keep important content within the centre 1012×1350 pixel area for grid safety
Instagram feed post checklist
- 1080×1350 pixels (4:5 portrait) for maximum feed presence
- JPG for photos, PNG for graphics with text
- Important content within centre 1012×1350 for grid display
- Upload at exactly 1080px width — wider images get compressed
- Avoid text in top/bottom 250px — covered by UI elements in some views
- Carousel slides should all use the same aspect ratio
- Test how the image appears on your profile grid before posting
Instagram post format comparison
All Instagram image sizes
Instagram supports three feed post formats: portrait at 1080×1350 (4:5), square at 1080×1080 (1:1), and landscape at 1080×566 (16:9). Stories and Reels use 1080×1920 (9:16) for full-screen vertical. Profile pictures upload at 320×320 but display at 110×110 in a circular crop. Carousel posts can use any supported ratio but all slides in a carousel must match. The platform accepts aspect ratios between 1.91:1 (landscape) and 4:5 (portrait) — anything outside this range gets auto-cropped.
Step-by-Step Workflow
Upload image to pre-configured 1080×1350 tool
Preview resized post
Download and upload to Instagram
Specifications
- Portrait post (recommended)
- 1080×1350 pixels (4:5)
- Square post
- 1080×1080 pixels (1:1)
- Landscape post
- 1080×566 pixels (16:9)
- Grid display (2026)
- 1012×1350 pixels (3:4 crop)
- Max width processed
- 1080 pixels (wider images downscaled)
- Accepted formats
- JPG, PNG, BMP, non-animated GIF
Best Practices
- 1080×1350 (4:5) is the optimal format — takes maximum space in feed and works with the 2025 grid
- Always upload at 1080px width — Instagram downscales wider images with compression
- Keep key content within centre 1012×1350 for safe grid display
- Use JPG for photo posts and PNG for graphics with text overlays
- Avoid landscape format for engagement — it takes the least feed space
- Carousel slides must all share the same aspect ratio — mix and Instagram forces a single crop
- Stories and Reels use different dimensions (1080×1920) — don't reuse feed posts for stories
Frequently Asked Questions
What is the best Instagram post size in 2026?
1080×1350 pixels in 4:5 portrait ratio. This occupies the most screen space in the feed and displays correctly on Instagram's updated 3:4 profile grid. Square (1080×1080) still works but takes less space and gets cropped on the grid.
Why does Instagram make my photos blurry?
Instagram downscales images wider than 1080 pixels and compresses the file. Upload at exactly 1080px width to avoid double compression. Also avoid uploading images smaller than 320px — Instagram upscales them, causing blur. Save as JPG at 85-90% quality for the best balance.
Should I still use square images on Instagram?
Square (1080×1080) still works in the feed but since 2025, the profile grid displays in 3:4 ratio, so square posts get vertically cropped on your grid. Portrait 1080×1350 is now the better default for both feed and grid consistency.
What aspect ratio does Instagram accept?
Between 1.91:1 (landscape) and 4:5 (portrait). Anything outside this range gets auto-cropped. Supported formats: 1080×566 landscape, 1080×1080 square, 1080×1350 portrait. Stories and Reels use 9:16 (1080×1920).
Do all carousel slides need the same size?
Yes. All slides in a carousel share the same aspect ratio. If you mix orientations, Instagram forces a single crop across all slides. Use 1080×1350 for all carousel slides for best results.