Quick answer
Use 1080 x 1350 pixels at 4:5 for a portrait Instagram carousel or 1080 x 1080 at 1:1 for a square carousel. Design every slide to the same ratio. Check the current composer because the first selected item can affect how the set is cropped or presented.
Source check: August 28, 2026. Platform apps, APIs, account types, and third-party publishers can change on different schedules. The final operational check is the preview and public result in the exact path you use.
At a glance
| Surface or choice | Size or limit | Ratio or source | What it means |
|---|---|---|---|
| Portrait carousel | 1080 x 1350 | 4:5 | Strong feed presence |
| Square carousel | 1080 x 1080 | 1:1 | Simple production |
| Landscape carousel | 1080 x 566 | About 1.91:1 | Use only when the material needs width |
| Mixed media | One consistent ratio | — | Test images and videos together |
What this page owns
An Instagram carousel can teach a process, show a sequence, compare options, or present proof. It should not split one sentence across ten slides merely to increase swipes.
That ownership boundary matters. Boomp uses one clear page for each search job instead of publishing near-duplicate pages that give different answers to the same question.
A dependable production method
- Set one ratio for the full set.
- Put the promise and subject on slide one.
- Keep text inside a repeatable safe area.
- Check video duration and crop inside mixed-media sets.
- Review every slide and caption after publishing.
The last check matters most. A design file, successful export, scheduler acceptance, or API response does not prove that the customer-facing artifact is correct.
Size is only one acceptance test
A technically valid file can still fail the business. Check these questions with the final media and caption together:
- Is every name, date, price, claim, location, and link current?
- Does the crop preserve the subject and the useful words?
- Are captions, contrast, and text alternatives sufficient for the content?
- Does the business have permission to use the people, customer material, music, footage, and marks shown?
- Does the call to action match the destination and what happens next?
- Did a responsible person approve this exact version?
For the full release gate, use the social media content quality checklist.
Where Boomp fits
Boomp fits when the recurring problem is larger than one pixel count. The free first look starts with a public website and returns ten finished posts, with images, a carousel and a short video, before asking for an account or a card. They are the software's reading of the public site and do not prove that Boomp knows the owner's voice. Publishing and the recurring month belong to the paid plans. Finished media and posts belong to paid work, with the customer's approval settings controlling what represents the business.
See ten finished posts made from your website, free.
Related guides
- Instagram Image Sizes 2026: Posts, Stories, Reels and Profiles
- Social Media Carousel Size 2026: Instagram, LinkedIn and Facebook
- Social Media Safe Zones 2026: Keep Text and Logos Visible
- Social Media Alt Text Guide: Write Useful Image Descriptions
