Instagram Grid & Post Sizes in 2026 (a Plain-English Cheat Sheet)

Every image you upload to Instagram is resized and re-compressed on the way in. Feed the app the wrong dimensions and it crops your subject, softens your text, or letterboxes a tall photo into an awkward strip. Pixels you never see again. This is the short list of numbers that prevents all of that in 2026.

Start with the safe width: 1080 px

Instagram displays feed images at 1080 px wide. Upload anything narrower and it gets upscaled and blurred; upload something much wider and it gets downscaled, which throws away the detail you worked for. Build every export around a 1080 px width and the rest of the math falls into place.

Feed posts

Portrait 4:5 is the workhorse format — 1080 × 1350 px. It claims the most vertical real estate in the feed without being cropped, so it stops the most thumbs. Square is 1080 × 1080, and landscape is 1080 × 566 (1.91:1), which is the smallest and easiest to scroll past.

The profile grid is a different ratio

This is the detail that trips up almost everyone. The profile grid now previews thumbnails at 3:4, not the 4:5 you actually posted. So a standard 4:5 post gets trimmed on the top and bottom inside your grid. If you are building a connected grid or a puzzle layout, export each tile at 3:4 (1080 × 1440) so what you see in the grid is exactly what you uploaded — no surprise crop.

Carousels and Stories

Carousel slides follow the same feed rules — 1080 × 1350 for portrait — and you should keep one ratio across every slide so the swipe feels seamless instead of jumping size. Stories and Reels are full-screen 9:16 at 1080 × 1920; keep important text inside the middle 80% so the interface buttons do not cover it.

Common mistakes that cost you sharpness

Three errors show up again and again: uploading a screenshot at a random size, exporting below 1080 px wide, and mixing 4:5 and 1:1 slides in the same carousel. Each one forces Instagram to resize on your behalf, and its resizer is built for speed, not for fidelity. Decide the ratio first, then export.

The one-line takeaway

For a grid that lines up perfectly, split and export at 3:4 (1080 × 1440). Feediz defaults to exactly that, so your tiles drop into the grid with no surprise cropping and no test posts.