Creating a carousel post takes six steps: choosing your platform format, planning your slide sequence, setting canvas dimensions, designing your slides, exporting the right file type, and uploading. Instagram uses one image file per slide; LinkedIn requires a single PDF document. The two platforms use completely different export formats and upload processes.
This guide covers the complete workflow for both platforms, including the correct dimensions and export format for each, the LinkedIn PDF distinction most guides overlook, best practices, common mistakes, and FAQ answers.
What Is a Carousel Post?
A carousel post is a multi-slide format that viewers swipe through one frame at a time. On Instagram, it is a set of up to 20 images or videos. On LinkedIn, it is a PDF document where each page becomes one swipeable slide.
| Platform | Carousel Type | Max Slides | How Viewers Navigate |
|---|---|---|---|
| Photo or video carousel | 20 | Swipe left in the feed | |
| PDF document post | Up to 300 (6 to 10 recommended) | Swipe in the document viewer |
Instagram carousels are individual image or video files uploaded together as a set. Viewers swipe through them left to right in their feed. Every slide can be a photo, a graphic, or a video clip up to 60 seconds.
LinkedIn carousels work differently. LinkedIn removed its native multi-image carousel for organic posts in late 2023. The current format is a PDF document post: each page of the PDF becomes one slide that viewers swipe through inside a document viewer. Uploading separate images to LinkedIn does not create a carousel.
What You Need Before You Start
The one prerequisite most creators skip is writing all slide copy before opening a design tool. Text is much faster to revise in a document than inside a layout, and most carousel rewrites happen because the content structure did not work, not the visual design.
Before you start, have each of these ready:
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A social media account on the target platform. You need an Instagram account or a LinkedIn profile or page to post.
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Slide content written out. Draft the headline, body text, and CTA for each slide as plain text before you design anything.
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A design tool. Any tool that lets you create consistent slides at a custom canvas size and export images or PDFs works.
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An image editor for asset refinement. You will crop, resize, and adjust individual images before placing them in the design. A built-in image editor handles this without switching apps.
Step 1: Choose Your Carousel Format
Instagram and LinkedIn use completely different carousel mechanisms. The platform you choose determines your design dimensions, your export file type, and your upload process. Choosing the wrong format before you start means recreating your files.
The two formats are not interchangeable.
| Platform | Format | Max Slides | Dimensions | Export Type |
|---|---|---|---|---|
| Photo or video carousel | 20 images or videos | 1080 x 1080 px or 1080 x 1350 px | One file per slide (JPG, PNG, or MP4) | |
| PDF document post | Up to 300 pages (6 to 10 recommended) | 1080 x 1080 px or 1080 x 1350 px | Single PDF Standard file |
Instagram carousels sit alongside formats like short-form video and social media video in the same feed. Carousels work best for step-by-step content, comparisons, and multi-part stories. For single short video content, see how to make an Instagram Reel.
LinkedIn carousels are PDF document posts only. LinkedIn discontinued native multi-image carousels for organic posts in late 2023. Uploading separate images to LinkedIn creates a standard multi-image post, not a swipeable carousel. PostMonk’s LinkedIn document carousel feature schedules this format natively across all plans, so you can queue PDF carousel posts alongside your other LinkedIn content.
Done: You know which platform you are creating for and which file format you will produce.
Step 2: Plan Your Slide Sequence
Writing your slide copy before you open a design tool saves significant revision time. Most poorly performing carousels have content problems, not design problems. Planning the sequence first prevents redesigning slides after realizing the narrative does not flow.
A reliable carousel follows a three-part structure:
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Hook slide. One clear headline or question that stops the scroll. Keep it under 10 words. The hook earns the swipe or loses it entirely.
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Body slides. One idea per slide, typically 3 to 8 slides. Write the copy for each slide before designing. Dense, text-heavy slides cause drop-off.
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CTA slide. A specific instruction. “Save this post,” “Comment with your answer,” or “Share with your team” all outperform generic “Follow for more.”
A typical Instagram carousel runs 7 to 10 slides. Short tutorials work in 3 to 5. A LinkedIn document carousel performs best at 6 to 10 slides.
Done: Your slide copy is written and you know how many slides each section needs.
Step 3: Set Your Canvas Dimensions
Canvas dimensions must be consistent across every slide in the set. Instagram crops or reformats mismatched slides, which breaks the visual alignment between frames. Set your canvas once and apply it to every slide before you design the first one.
Instagram and LinkedIn accept the same two sizes:
| Platform | Square | Portrait (Recommended) |
|---|---|---|
| 1080 x 1080 px (1:1) | 1080 x 1350 px (4:5) | |
| 1080 x 1080 px (1:1) | 1080 x 1350 px (4:5) |
Portrait (4:5) fills more of the phone screen and typically generates higher engagement on both platforms. For a full reference covering social media image sizes across all platforms, including Stories, Reels, and cover images, see the complete specification guide.
Done: Your canvas is set to one consistent dimension before you start designing.
Step 4: Design Your Slides
Visual consistency across all slides signals quality. Inconsistent fonts, colors, or spacing makes a carousel look rushed and breaks the viewer’s trust in the content.
To design your slides, follow these five sub-steps:
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Establish your visual system on slide 1. Choose one font pairing and 2 to 3 brand colors. Apply both across every slide without exception. Lock these decisions before designing any other slide.
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Write one idea per slide. Use large, readable type. Limit each slide to one headline and at most two supporting lines. If you need more, split into two slides.
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Add supporting visuals. Photos, icons, or illustrations reinforce each slide’s idea. White space is fine; visuals do not need to fill the frame.
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Add directional cues. An arrow, page number, or “swipe” prompt on each slide tells viewers more content follows. Carousels without directional cues see fewer swipes past slide 1.
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Refine your assets. Crop, resize, adjust brightness, and remove backgrounds as needed before finalizing. PostMonk’s built-in image editor handles cropping, resizing, filters, and annotation without leaving the platform.
Done: All slides are visually consistent, each carries one idea, and directional cues appear on every slide except the last.
Step 5: Export in the Right Format
Instagram and LinkedIn require completely different export formats. Exporting LinkedIn slides as individual images instead of a PDF is the single most common technical mistake for LinkedIn carousel posts, and it results in a standard multi-image post, not a carousel.
For Instagram: Export each slide as a separate file. Use JPG or PNG at your canvas dimensions (1080 x 1080 px or 1080 x 1350 px). You will upload the files one by one in the correct order during the posting step.
For LinkedIn: Export your entire design as one PDF Standard file. Do not export as separate images. Each page of the PDF becomes one slide in the document viewer. Keep the file under 100 MB. LinkedIn supports up to 300 pages per document, but 6 to 10 pages is the optimal range for engagement.
PPTX and DOCX also work for LinkedIn uploads, but PDF Standard renders most consistently across desktop and mobile.
Done: You have either a set of separate image files (Instagram) or a single PDF file (LinkedIn) ready to upload.
Step 6: Upload and Post Your Carousel
Uploading a carousel takes under two minutes once your files are ready. The steps differ between Instagram and LinkedIn, and between desktop and mobile on LinkedIn.
On Instagram:
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Tap + at the bottom of the app and select Post.
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Tap the multiple-images icon (two overlapping squares) in the media picker.
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Select your slides in the correct order. Instagram numbers them as you tap.
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Tap Next and edit individual slides with filters or text overlays if needed.
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Write your caption and add hashtags.
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Tap Share.
Instagram supports up to 20 images or videos per carousel post.
On LinkedIn:
Desktop:
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Click Start a post.
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Click More (the three dots icon in the post composer).
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Select Add a document.
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Upload your PDF file.
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Add a document title (required before posting).
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Write your caption.
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Click Post.
Mobile:
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Tap Post in the navigation bar.
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Type your caption.
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Tap More (the three dots icon).
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Tap Add a document.
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Select your PDF file.
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Add a document title.
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Tap Post.
PostMonk users: PostMonk’s scheduler supports both Instagram carousels and LinkedIn document carousel posts from one workspace. Draft your caption, attach your files, and schedule both platform formats without switching between apps.
Done: Your carousel is posted or scheduled on the target platform.
Carousel Post Best Practices
Slide 1 is the most important real estate in your carousel. If it does not stop the scroll, the rest of the slides are invisible to most viewers.
Six practices that consistently improve carousel performance:
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Make slide 1 impossible to scroll past. Use a bold headline, a clear promise, or an intriguing question. No ambiguity. The viewer must immediately know why they should swipe.
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Stick to one idea per slide. More slides at one idea each always outperform fewer slides with two or three ideas crammed together.
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Use consistent fonts, colors, and spacing throughout. Visual inconsistency signals that the carousel was made quickly. Lock your visual system in Step 4 and apply it to every slide.
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Add directional cues on every slide except the last. Arrows, page numbers, and “swipe” prompts tell viewers more content is coming. Without cues, many viewers stop at slide 1.
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Write your caption to tease, not reveal. The caption should make viewers curious about what is inside the carousel, not summarize every slide.
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End with a specific CTA. “Save this for later,” “Comment with your question,” or “Share with a teammate” are all more effective than generic “Follow us.”
Common Carousel Mistakes to Avoid
The most common and costly mistake is uploading separate images to LinkedIn expecting a swipeable carousel. It does not work. Only PDF document posts create the LinkedIn carousel experience.
Five mistakes that consistently undermine carousel performance:
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Mixing slide dimensions within one carousel. Using different sizes for different slides causes Instagram to reformat them automatically. Set your canvas dimensions once in Step 3 and apply them to every slide.
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A weak or vague hook slide. The first slide carries the viewer’s decision to swipe. A generic headline loses that decision. Write slide 1 last, after you know what the full carousel delivers, so the hook accurately promises what is inside.
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Uploading separate images to LinkedIn. This creates a standard multi-image post, not a LinkedIn carousel. LinkedIn removed native image carousels for organic posts in late 2023. Export your slides as a single PDF Standard file.
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Too much text per slide. Each slide should carry one headline and at most two supporting lines. Dense text causes drop-off at that slide. Split long slides into two.
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No CTA slide. The final slide is the highest-attention point of the carousel. Ending without a CTA wastes that attention. Give viewers a specific next action.
FAQs
What is the app that creates carousel posts?
Carousel posts can be created with any design tool that supports multi-slide layouts. Common tool types include general-purpose design platforms, presentation editors, and image editors. For LinkedIn, you also need a way to export your slides as a single PDF file. Social media scheduling tools let you queue and post carousels to Instagram and LinkedIn without switching between apps.
Is a carousel just a post with multiple photos?
On Instagram, yes: a carousel is a post with up to 20 photos or videos that viewers swipe through in sequence. On LinkedIn, no: a LinkedIn carousel is a PDF document post where each page of the document becomes one swipeable slide. Uploading multiple separate images to LinkedIn does not create a carousel.
How can I create a carousel post on Facebook?
Facebook carousel is primarily an advertising format. You create carousel ads in Facebook Ads Manager, where each card has its own image, headline, and link. Organic multi-image posts on Facebook display as a photo album or grid, not as a swipeable carousel in the same sense as Instagram or LinkedIn.
How many slides should a carousel post have?
For Instagram, 7 to 10 slides typically see the strongest engagement. Short step-by-step content works in 3 to 5 slides. Avoid carousels longer than 15 slides unless every slide carries genuinely distinct value.
For LinkedIn document carousels, 6 to 10 slides is the optimal range. Well-structured, focused documents in that range consistently outperform longer ones with professional audiences.
Can you add photos to an Instagram carousel after posting?
You cannot add or remove slides after posting. As of March 2026, Instagram allows you to reorder slides in an existing carousel, but the original set of slides is fixed once you post. You can edit the caption at any time, but the media set is locked at publish.
Carousel posts take planning, but publishing them does not have to slow you down. PostMonk schedules Instagram carousels and LinkedIn document carousel posts from one workspace, so you can draft, attach your files, and post to both platforms without switching between apps. Try PostMonk free.
