Carousel Post Size Guide: Dimensions for Every Platform (2026)

Here are the optimal carousel dimensions for every major platform in 2026:

**LinkedIn** - Dimensions: 1080x1080 (square) or 1080x1350 (portrait) - Aspect ratio: 1:1 or 4:5 - Format: PDF (carousel) or PNG/JPG (multi-image) - Slide limit: 300 pages (PDF), 20 images - Max file size: 100MB (PDF), 10MB per image

**Instagram** - Dimensions: 1080x1080 (square) or 1080x1350 (portrait) - Aspect ratio: 1:1 or 4:5 (recommended) - Format: JPG or PNG - Slide limit: 20 images - Max file size: 30MB per image

**X (Twitter)** - Dimensions: 1080x1080 (square) - Aspect ratio: 1:1 or 16:9 - Format: JPG or PNG - Slide limit: 4 images per tweet - Max file size: 5MB per image

**TikTok** - Dimensions: 1080x1920 (portrait) - Aspect ratio: 9:16 - Format: JPG or PNG - Slide limit: 35 images - Max file size: 20MB per image

**Pinterest** - Dimensions: 1000x1500 (portrait) - Aspect ratio: 2:3 - Format: JPG or PNG - Slide limit: 5 images per carousel pin - Max file size: 20MB per image

**Facebook** - Dimensions: 1080x1080 (square) - Aspect ratio: 1:1 - Format: JPG or PNG - Slide limit: 10 images - Max file size: 30MB per image

If you're posting to one platform, use that platform's recommended size. If you're cross-posting, here's the decision tree:

**Posting to LinkedIn + Instagram?** Use 1080x1350 (4:5). Works perfectly on both.

**Posting to X + LinkedIn?** Use 1080x1080 (square). X crops non-square images unpredictably.

**Posting to TikTok?** Always use 1080x1920 (9:16). TikTok carousels are full-screen vertical.

**Posting everywhere?** Create at 1080x1080 (square) as the base. It works acceptably on every platform, even if it's not optimal for TikTok or Pinterest.

SwipeThread exports to every platform's optimal dimensions from a single carousel — no manual resizing needed.

**Using landscape orientation.** Carousel content is consumed on mobile. Portrait (4:5) or square (1:1) fills more screen real estate and gets more attention.

**Text too small.** If your text isn't readable at 375px width (iPhone screen), it's too small. Minimum 24px equivalent for body text, 36px+ for headlines.

**Ignoring safe zones.** Instagram crops carousel thumbnails to square in the feed grid. Keep important content centered, not at the edges.

**Wrong file format.** LinkedIn carousels uploaded as PDF display differently than multi-image posts. PDF gives you the true swipeable carousel experience with a slide counter.

**Inconsistent dimensions.** All slides in a carousel should be the same size. Mixing dimensions causes cropping and alignment issues.

The optimal number depends on the platform and content type:

**LinkedIn:** 6-10 slides. LinkedIn users consume longer-form content. PDF carousels with 8+ slides often perform best.

**Instagram:** 5-7 slides. Completion rates drop after slide 7. Front-load your best content.

**X/Twitter:** 2-4 images. X limits you to 4 images per tweet. Make each one count.

**TikTok:** 5-10 slides. TikTok's carousel format is newer, but early data shows 5-8 slides perform best.

**Pinterest:** 3-5 pins. Pinterest carousel pins are limited to 5 images. Use all 5 for maximum real estate.

The universal rule: every slide must earn its place. If a slide doesn't add value, cut it.

SwipeThread automatically exports your carousel in the correct dimensions for every platform. Create once, export everywhere:

- LinkedIn carousel (1080x1080 PDF or 1080x1350) - Instagram carousel (1080x1350 portrait) - X/Twitter images (1080x1080 square) - TikTok carousel (1080x1920 vertical) - Pinterest pins (1000x1500) - Facebook carousel (1080x1080)

No manual resizing. No Canva. No dimension Googling. Just create and export.