LinkedIn Carousel Image Size: How to Keep PDF Slides From Going Blurry

You exported a clean carousel, uploaded the PDF to LinkedIn, and the slides came out soft, pixelated, or cropped at the edges. The design looked fine in your tool. It looks worse on LinkedIn. This is almost always an image-sizing problem — not a LinkedIn problem.

This guide is about the image inside the slide: how big each picture should be, why it gets blurry, and how the sizing changes when you move a carousel between Instagram and LinkedIn. For the broader document specs (page limits, file types, fonts), see the LinkedIn carousel specs guide.

The Short Answer

Size every slide image to the canvas it lands on, at full resolution:

If each image matches the slide dimensions at 1080px or larger on the shortest side, your PDF stays sharp. The problems start when the image is smaller than the canvas, or the PDF compresses it on export.

Two Sizes You're Actually Dealing With

People say "carousel size" and mean one of two different things. Mixing them up is what causes blur.

• Canvas size — the dimensions of the slide itself (e.g. 1080 × 1080 px). This is what LinkedIn renders.
• Image resolution — the pixel dimensions of the photo or graphic you place on that canvas.

A 1080 × 1080 slide with a 600 × 600 image stretched to fill it will look blurry, because the image is being upscaled. The canvas is the right size; the image inside it isn't. Always place images at 100% of their native resolution, sized to the canvas — never scale a small image up to fit.

Why LinkedIn Carousel Images Go Blurry

There are only a handful of real causes, and all of them are fixable before you upload:

1. Upscaling. The source image is smaller than the slide, so the design tool stretches it. Stretched pixels = soft edges. Start with an image that's at least as large as the canvas.
2. PDF compression on export. Many tools compress images when exporting to PDF. Export at the highest quality / "print" setting so images aren't re-compressed down.
3. Wrong export resolution. Exporting a 1080px design at a smaller pixel size, then letting LinkedIn scale it back up. Export at the canvas's true pixel dimensions.
4. Re-saving JPGs repeatedly. Each JPG save loses quality. If you're editing and re-exporting a lot, work from PNG or the source file until the final export.
5. Screenshotting slides. A screenshot is capped at your screen resolution, which is usually lower than 1080px. Always export from the source, never screenshot.

The fix for all of these is the same idea: keep the image at full resolution from creation to upload, and don't let any step in the chain shrink it.

Cropping: What Happens When You Change the Ratio

Blur is one issue. Cropping is the other — and it shows up the moment a carousel changes aspect ratio.

Instagram's best-performing size is 4:5 portrait (1080 × 1350 px). LinkedIn carousels are usually 1:1 square (1080 × 1080 px). Those are different shapes, so something has to give:

• 4:5 → 1:1 (Instagram to LinkedIn): the top and bottom of each slide get cropped, or the image gets letterboxed with padding. Text near the top or bottom edge can get cut off.
• 1:1 → 4:5 (LinkedIn back to Instagram): the square slide leaves empty bands above and below unless you add padding or re-export.

The safe move is to keep important text and faces inside a centered "safe zone" — at least 50px from every edge, and ideally inside the central square — so the same image survives a ratio change without losing anything that matters.

Recommended Image Specs

For LinkedIn carousel images that stay sharp on every device:

Over 60% of LinkedIn traffic is mobile, so a slide that's sharp and readable on a phone is the real target. If it looks good at phone size, it looks good everywhere.

A Quick Word on Instagram Limits

If you're starting on Instagram, two numbers matter for sizing: Instagram carousels allow up to 20 slides, and each image should be 1080px wide at 1:1, 4:5, or 1.91:1. Going under 1080px is the most common cause of soft Instagram slides, same as on LinkedIn. Full breakdown in the Instagram carousel sizes guide.

The point: size right once, at 1080px, and the same images repurpose cleanly to LinkedIn without a second quality hit.

Going the Other Way: PDF Back to Instagram

This is the newer direction. Plenty of creators build on LinkedIn first — a polished PDF document post — and then want it on Instagram. To do that, each page of the PDF has to become an individual image.

The thing to watch is, again, size. When you extract pages from a PDF, the output image is only as sharp as the PDF allowed. If the PDF was built at 1080px, your extracted slides come out at usable resolution. If it was built smaller, they won't.

igli has a built-in PDF to images mode that extracts every page of a LinkedIn carousel as a clean image, sized for Instagram:

1. Open igli and switch to the PDF to IMG tab.
2. Upload your LinkedIn carousel PDF.
3. Download each page as a ready-to-post image.
4. Resize to 4:5 (1080 × 1350 px) if you want maximum Instagram feed space.

More on the round trip: convert a LinkedIn PDF back to Instagram images.

Pre-Upload Checklist

Before you publish, run through this:

• Source images are 1080px or larger on the shortest side
• Nothing is upscaled — no small image stretched to fill the canvas
• PDF exported at highest / print quality
• Final PDF is under 10 MB
• Important text sits 50px+ from every edge (survives a ratio change)
• Previewed on a phone — sharp and readable at phone size

Frequently Asked Questions

What size should images be in a LinkedIn carousel?

1080 × 1080 px (1:1 square) is the safest. Each image should be at least 1080px on its shortest side so LinkedIn never has to upscale it. Landscape (1920 × 1080) and portrait (1080 × 1350) work too.

Why are my LinkedIn PDF carousel images blurry?

Almost always because the image is smaller than the slide and gets upscaled, or the PDF compressed it on export. Use source images at 1080px+ and export the PDF at the highest quality setting.

Does converting Instagram slides to a LinkedIn PDF reduce quality?

It shouldn't, if the images stay at full resolution and the PDF isn't re-compressed. igli keeps slides at their native size and exports a sharp PDF — no upscaling or extra compression.

What size are images when I convert a LinkedIn PDF to Instagram?

Each extracted page comes out at the PDF's built resolution. If the PDF was made at 1080px, the images are Instagram-ready; resize to 1080 × 1350 px (4:5) for the most feed space.

Size Once, Post Everywhere

Get the image size right one time — 1080px, full resolution, exported at print quality — and your carousel stays sharp wherever it goes. igli handles the resizing in both directions: Instagram images to a LinkedIn PDF, or a LinkedIn PDF back to images.