Quick answer
For a LinkedIn document carousel, use a PDF with consistent pages. A 4:5 page such as 1080 x 1350 works well for phone reading; a square page such as 1080 x 1080 is a simpler alternative. LinkedIn supports PDF document uploads, but readability matters more than a magic pixel count.
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 document page | 1080 x 1350 | 4:5 | Phone-first working canvas |
| Square document page | 1080 x 1080 | 1:1 | Simple alternative |
| File type | — | Supported LinkedIn document type | |
| Page consistency | Same size throughout | — | Prevents jumps and odd crops |
What this page owns
A LinkedIn carousel is a document. Searchable or selectable text, meaningful reading order, clear contrast, and an accurate post caption make it more useful than a stack of flattened screenshots.
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
- Export one consistent PDF.
- Read it at phone width before upload.
- Use large type and strong contrast.
- Check the document title and post caption.
- Open every uploaded page and verify the order.
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.
If the size is settled and the slides are the problem, the free carousel generator makes one complete carousel from your website, slides and caption, and emails it to you with a private link. For what to put on those slides, start with carousel post ideas for a service business.
Related guides
- LinkedIn Image Sizes 2026: Posts, Pages and Article Covers
- Social Media Carousel Size 2026: Instagram, LinkedIn and Facebook
- Social Media Alt Text Guide: Write Useful Image Descriptions
- Social Media Content Quality Checklist: 30 Checks Before Publishing
- Carousel Post Ideas for a Service Business
- LinkedIn Post Ideas for Consultants, Coaches and Advisors
