Upload vertical subject
Upload an image with a naturally vertical subject (people, products, food, OOTD) — landscape sources leave dead space top and bottom.
Instagram Portrait Photo Resize
An Instagram portrait post (1080×1350px, 4:5) is the tallest portrait ratio Instagram supports and the highest feed-occupancy single-post format. At the same width, portrait takes about 25% more screen than square (1:1), increasing per-post dwell time on mobile — one of the strongest signals Instagram’s algorithm uses for distribution. So brand-marketing and influencer content optimizing for reach typically default to 4:5, and it pairs naturally with vertical subjects like people, products, food, and OOTD. The profile grid still crops to a square, so the grid preview must be checked alongside the post view, and forcing landscape shots into 4:5 either adds dead space or chops the focal subject — so it works best when the source is genuinely vertical. This tool exports a precise 1080×1350px frame while previewing the inner 1080×1080 grid crop at the same time.
How to use
Verify grid square crop
Check the center-square (1080×1080) grid crop preview to confirm faces or product hero never get clipped on the profile.
Hold 4:5 across carousel and export
Export 1080×1350px JPG. For carousels, hold every slide at 4:5 to keep slide-to-slide flow intact.
When to use this tool
Dwell time is one of the strongest single signals Instagram’s algorithm uses to set distribution, and 4:5 is the ratio that lifts dwell time most reliably — which is why it has become the de facto default for Instagram single-image posts.
Setting 4:5 as the master ratio for brand campaigns or influencer single-image posts to maximize reach
Producing portrait, product, food, or OOTD content without grid-clip surprises on the profile
Building a 4:5 carousel where every slide must hold the same ratio for slide-to-slide flow
Instagram Portrait Post Spec Guide
Recommended sizes as of 2025. The 4:5 ratio is the tallest portrait ratio Instagram supports.
| 1080 × 1350px |
| Aspect ratio 4:5 |
| File format: JPG, PNG |
| 4:5 is the maximum portrait ratio supported in the Instagram feed. |
| Portrait posts take up roughly 30% more feed space than square posts. |
| The feed grid preview crops to a center-based square. |
| Takes up the most screen real estate in the feed. |
| 4:5 ratio holds attention longer during mobile scrolling. |
| No UI overlaps the bottom, so the full frame is usable. |
| Maximum file size: 30MB (photos) |
| Supported formats: JPG, PNG |
| Recommended resolution: 1080px width or above |
FAQ
What is the tallest ratio Instagram supports for feed posts?
Instagram supports up to 4:5 (1080×1350px) for feed posts. Taller images will be auto-cropped.
Why are portrait posts better than square posts?
Portrait posts occupy more vertical space in the feed, keeping the viewer's attention longer while scrolling.
What is the maximum file size for a portrait post?
Photos can be up to 30MB. JPG and PNG are supported, with a recommended minimum width of 1080px.
How do portrait photos appear in the profile grid?
The profile grid crops them to a center-based square preview. The full 4:5 image is visible when the post is opened.
Can I use the portrait ratio in carousel posts?
Yes, setting the first image to 4:5 applies the same ratio to all slides. Use 1080×1350px for every image to keep them consistent.