Quick answer
Use 1080 x 1350 at 4:5 for a portrait image carousel or 1080 x 1080 at 1:1 for a square carousel. Keep every slide in one carousel the same dimensions. On LinkedIn, the swipeable document format is commonly a PDF, which is a different publishing path from multiple images.
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 image carousel | 1080 x 1350 | 4:5 | Feed-first working canvas |
| Square image carousel | 1080 x 1080 | 1:1 | Simple mixed-platform canvas |
| LinkedIn document carousel | Consistent PDF pages | 4:5 or square | Publish as a document |
| First slide | Same as all slides | Consistent | Sets the visual contract |
What this page owns
A carousel is a sequence, not a pile of graphics. The first slide earns the swipe, the middle slides complete one argument, and the final slide gives a useful next step. Every slide must still make sense when viewed alone or shared as a screenshot.
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
- Choose one ratio before designing.
- Use the same dimensions on every slide.
- Number slides when order matters.
- Add text alternatives in the caption or platform tools.
- Open every slide 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 Carousel Size 2026: Portrait, Square and Crop Rules
- LinkedIn Carousel Size 2026: PDF Page Dimensions and Review
- Social Media Safe Zones 2026: Keep Text and Logos Visible
- Social Media Alt Text Guide: Write Useful Image Descriptions
