Instagram reference
The best Instagram post size is 1080 × 1350 px, a 4:5 portrait. It fills more of the feed than a square and is the tallest shape Instagram's publishing API accepts. Postdom makes your Instagram posts at this size automatically, so nothing gets cropped in the feed.
Use 1080 × 1350 px for feed posts and 1080 × 1920 px for Stories and Reels. Every size below comes from Instagram's Help Centre or Meta's developer docs.
| Format | Size | Shape | Notes |
|---|---|---|---|
| Portrait post (best all round) | 1080 × 1350 px | 4:5 | The tallest shape the publishing API accepts, and the size Postdom makes Instagram posts at.Source: Meta for Developers |
| Tallest post in the app | 1080 × 1440 px | 3:4 | The tallest shape the Instagram app keeps uncropped. The publishing API does not accept it.Source: Instagram Help Centre and Meta for Developers |
| Square post | 1080 × 1080 px | 1:1 | Inside the range for both the app and the API.Source: Instagram Help Centre |
| Landscape post | 1080 × 566 px | 1.91:1 | The widest shape Instagram keeps uncropped.Source: Instagram Help Centre and Meta for Developers |
| Slideshow (multi-photo post) | 1080 × 1350 px | 4:5 | Every slide takes one shape. Up to 20 photos and videos in the app, 10 photos and videos through the API.Source: Instagram Help Centre and Meta for Developers |
| Story | 1080 × 1920 px | 9:16 | Meta recommends 9:16 for Story images and gives no pixel size. Postdom draws Stories at this size.Source: Meta for Developers |
| Reel | 1080 × 1920 px | 9:16 | Instagram accepts 1.91:1 to 9:16, at least 720 px. Postdom makes Reels at this size.Source: Instagram Help Centre |
| Reel cover | 420 × 654 px | 1:1.55 | Instagram's recommended cover size.Source: Instagram Help Centre |
| Profile picture | Not published | Shown as a circle | Instagram's Help Centre gives no pixel size. Tip: use a square image with the face or logo in the centre. |
Sources, all checked 8 October 2026:
Instagram keeps a photo at full quality when it is between 320 px and 1080 px wide, with a shape from 1.91:1 to 3:4. Anything narrower is enlarged, anything wider is reduced, and anything outside that shape is cropped.
Scheduling tools use the publishing API, which takes JPEG images from 4:5 to 1.91:1, up to 8 MB, and scales wider images down to 1440 px.
The safe Instagram portrait size is 1080 × 1350 px (4:5). It works in the app and through the publishing API, and it takes up more of the screen than a square.
The app now keeps photos as tall as 1080 × 1440 px (3:4), but the publishing API still stops at 4:5. If you schedule posts, stay at 1080 × 1350 px.
The best Instagram carousel size is 1080 × 1350 px (4:5) for every slide. A square 1080 × 1080 px (1:1) works too. The app keeps photos as tall as 1080 × 1440 px (3:4), but the publishing API stops at 4:5, so scheduled carousels should stay at 1080 × 1350 px.
Instagram gives every slide in a carousel the same shape, so use one size for all of them. Through the publishing API, every slide is cropped to the first slide's shape. The app takes up to 20 photos and videos in one carousel, and the publishing API takes up to 10 photos and videos.
Sources: Instagram Help Centre, "Image resolution of photos you share on Instagram" and "Share a post with multiple photos or videos on Instagram"; Meta for Developers, "IG User Media" reference.
For a step-by-step walkthrough, read how to make a carousel on Instagram.
Make Stories 1080 × 1920 px, a full-screen 9:16. Meta recommends 9:16 for Story images so nothing is cropped or padded, and gives no exact pixel size.
Postdom keeps text clear of the top and bottom of every Story, where Instagram shows your name and the reply bar.
Make Reels 1080 × 1920 px (9:16). Instagram accepts shapes from 1.91:1 to 9:16 at 720 px or more, and recommends a 420 × 654 px cover image.
For crop or fit, export settings and the publishing limits, see the full Instagram Reel size guide.
Instagram's Help Centre gives no pixel size for profile pictures. Your picture shows as a small circle, so a good tip is to upload a square image with the face or logo in the centre, away from the corners.
Postdom makes posts at the right Instagram post size for you. Paste your website and it makes finished posts, slideshows and videos in your brand, already sized for the feed, Stories and Reels.
Postdom Free gives you 1 post a month on 2 accounts on any platform, with no card. For slides right now, the free slideshow maker downloads slides at 1080 × 1350 px.
1080 × 1350 px, a 4:5 portrait. It fills more of the feed than a square and works in the app and through the publishing API.
In the app, yes: Instagram keeps photos up to 3:4. Through the publishing API, which scheduling tools use, the tallest shape is 4:5, so 1080 × 1350 px is the safe choice.
Yes. A photo outside 1.91:1 to 3:4 is cropped to fit, and every slide in a slideshow takes the same shape.
Postdom makes posts at Instagram's sizes from the start: 1080 × 1350 px for the feed and 1080 × 1920 px for Stories and Reels. Then you approve them and Postdom posts them, or you schedule them yourself.
Postdom reads your website and fills your For You feed with finished posts in your brand, at the right size for each format. You approve, edit or skip each one, and Postdom posts what you approve to Instagram, TikTok and more. To post them yourself, see how to schedule Instagram posts.
Start on Free: 1 post a month on 2 accounts on any platform.
Paste your website and see your first post today.