How do I post a PowerPoint presentation as a LinkedIn carousel?

LinkedIn document posts accept PDF files and display each page as a swipeable carousel slide. The workflow is: (1) Upload your PPTX to LinkedIn Carousel — the tool changes the p:sldSz dimensions in ppt/presentation.xml from the standard 16:9 ratio to 1:1 square (cx="9144000" cy="9144000"). (2) Download the Square PPTX. (3) Open it in PowerPoint → File → Export → Create PDF/XPS → Save. (4) On LinkedIn, start a new post → click Add a document → upload the PDF. LinkedIn renders each page as a full-width swipeable carousel.

Why does LinkedIn recommend 1:1 square slides for carousel posts?

LinkedIn's feed is predominantly mobile. Square (1:1) slides occupy the maximum possible screen width in the feed without letterboxing or cropping. The standard PowerPoint widescreen format (16:9) appears as a narrow horizontal band on mobile feeds because LinkedIn constrains the carousel height. A 1:1 square format fills the viewport width completely, making text larger and more readable, resulting in significantly higher dwell time and engagement rates.

What is p:sldSz in a PPTX file and what does 9144000 mean?

In the OOXML format, p:sldSz is an attribute on the sldSz element in ppt/presentation.xml that defines the slide canvas dimensions. The values cx (width) and cy (height) are in EMU — English Metric Units — where 914400 EMU equals 1 inch. The standard widescreen 16:9 slide is 12192000 × 6858000 EMU (13.33 × 7.5 inches). Setting both cx and cy to 9144000 produces a 10 × 10 inch square canvas, which is the ideal 1:1 format. LinkedIn Carousel makes this single attribute change.

Why not convert the PPTX directly to PDF in the browser?

Accurate PPTX-to-PDF conversion in a browser requires full OOXML rendering: resolving embedded fonts, rendering vector shapes, applying theme schemes, computing text layout with kerning. Libraries that attempt this (pptxgenjs, PPTXtoPDF) produce output with broken text layout, missing fonts, and incorrectly rendered gradients. PowerPoint's own export engine — available in the desktop app and Microsoft 365 online — produces pixel-perfect PDF output. The square PPTX approach is the only method that guarantees font-accurate, pixel-perfect output for professional LinkedIn posts.

Will text and objects in my slides reflow when I change to square format?

Text boxes, shapes, and images retain their absolute position and size in EMU coordinates after the canvas resize. The canvas itself changes from 16:9 to 1:1, so objects that were near the horizontal edges of a widescreen slide may end up outside the new square canvas boundary. For best results: design your template in square format from the start, or ensure all content is placed in the central 60% of the widescreen slide before squarifying. The tool makes the dimension change in one attribute — you review the output in PowerPoint before exporting to PDF.

Is the output safe to send to clients and post publicly?

Yes. All processing runs entirely in your browser. Your PPTX file is never transmitted to any server. Additionally, before posting to LinkedIn, run your deck through Metadata Wiper to remove the author name, company name, and last-saved-by fields from docProps/core.xml — those fields are embedded in the PPTX and remain visible in the downloaded PDF's document properties.

LinkedIn Carousel — Reformat PPTX to 1:1 Square for LinkedIn Document Posts

1:1 Square9144000 EMUp:sldSzAll SlidesFastPPTX → PDF

🟦

Drop your .pptx to squarify

or click to browse

Changes slide size to 1:1 square · Export as PDF in PowerPoint for LinkedIn

📋 Full workflow

Upload your deck here → download Square PPTX
Open in PowerPoint → File → Export → Create PDF/XPS
Upload the PDF to LinkedIn as a Document Post
LinkedIn renders each page as a swipeable carousel slide

📖 How it works · EMU dimensions · LinkedIn specs · Design tips

How the dimension change works

The tool opens ppt/presentation.xml and uses a regex to locate the <p:sldSz self-closing tag. It replaces the existing cx and cy attribute values with 9144000:

Before:

<p:sldSz cx="12192000" cy="6858000" type="screen16x9"/>

After:

<p:sldSz cx="9144000" cy="9144000" type="screen16x9"/>

All slide content — shapes, images, text boxes, charts — retains its absolute position in EMU coordinates. No content is moved or deleted.

Common slide dimension reference

Format	cx (EMU)	cy (EMU)	Use case
16:9 Widescreen	12192000	6858000	Standard PowerPoint default
4:3 Standard	9144000	6858000	Older compatibility format
1:1 Square	9144000	9144000	LinkedIn, Instagram carousels
9:16 Vertical	6858000	12192000	Instagram Stories, TikTok

Design tips for square carousel slides

→ Use large text (28pt minimum). Reading happens quickly as people scroll — small text is ignored.
→ One point per slide. LinkedIn carousels perform best with 8–15 slides of single punchy statements.
→ Keep content in the center 80% of the canvas. After squarifying a 16:9 deck, content near the left/right edges may extend beyond the square boundary — review in PowerPoint before exporting.
→ The first page is the cover — make it a compelling hook. LinkedIn shows only the cover in the feed; viewers swipe after reading it.

Frequently Asked Questions

Can I use this for Instagram carousel posts too?

Yes. Instagram carousels also perform best in square (1:1) format. The same Square PPTX workflow applies — export to PDF in PowerPoint, then convert individual PDF pages to JPEG using a tool like Adobe Acrobat, Canva, or pdf2img. Instagram requires individual image files per slide rather than a single PDF document.

What if I want 4:3 format instead of 1:1 square?

Use cy="6858000" instead of cy="9144000" in the p:sldSz tag. You can manually open the downloaded PPTX in PowerPoint → Design → Slide Size → Custom Slide Size to change dimensions to any format before exporting.

Who uses LinkedIn Carousel Export

💡

Thought Leaders

Consultants and executives repurpose their conference keynotes and internal strategy decks directly into LinkedIn carousels — the highest-engagement format on the platform — with zero redesign.

🏢

Agency Content Teams

Social media agencies produce LinkedIn document carousels at scale for clients. The 1:1 reformatter lets them deliver polished square-format posts from client-supplied PPTX files in minutes.

🎓

Educators & Coaches

Business coaches convert their lesson slides into LinkedIn carousel posts to grow their following. Document posts receive 3× more reach than image posts in LinkedIn's algorithm.

🛒

Product Marketers

Go-to-market teams publish product launch and feature announcement decks as LinkedIn carousels to reach decision-makers in their feed without requiring them to download anything.

LinkedIn Carousel Export vs alternatives

Feature	DeckMedic LinkedIn Export	Manual resize in Canva	Export as PDF direct
Converts 16:9 → 1:1 automatically	✅ Yes — all slides	⚠️ Manual per slide	❌ Keeps 16:9 ratio
Preserves text & layout	✅ Yes — vector output	⚠️ May reflow text	✅ Yes
Works on PPTX directly	✅ Yes — no Canva needed	⚠️ Must import/export	✅ Yes
No upload to server	✅ All in-browser	❌ Canva cloud	❌ If using cloud tools
Batch-processes all slides	✅ Yes	❌ Manual per slide	✅ Yes
Free	✅ Unlimited	⚠️ Canva free tier	✅ Free

LinkedIn Carousel
Squarify for Document Posts

What this tool actually does