The 2026 Social Media Dimensions Cheat Sheet That Will Save You Hours of Cropping
Content Strategy

The 2026 Social Media Dimensions Cheat Sheet That Will Save You Hours of Cropping

Sanjay • April 17, 2026 • 8 min read
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Post a video at the wrong aspect ratio and Instagram compresses it into a pixelated mess. Use a LinkedIn cover photo at Facebook dimensions and your brand looks unprofessional before a single word is read.

Wrong sizes do not just look bad. They hurt reach, engagement, and algorithm performance across every platform.

This cheat sheet is the definitive reference for every major social platform in 2026. Save it. Share it. Stop guessing.

The Core Principle: Aspect Ratio Is Everything

Every social platform displays content differently across feed, stories, reels, and carousel formats. The three most common aspect ratios you need to memorize are:

  1. 1:1 — Square. The universal format for feed posts across all platforms.
  2. 4:5 — Portrait. This is the recommended format for Instagram feed posts and LinkedIn articles. It takes up 78% more screen space than a square.
  3. 9:16 — Vertical. Built for Reels, Shorts, and Stories. This is the format dominating 2026 algorithm preferences.

Beyond these three, you will encounter 16:9 (landscape video), 1.91:1 (Facebook link previews), and platform-specific variations that exist for specific ad placements and organic formats.

Facebook Dimensions

Facebook is still the highest-reach platform for organic business content in many niches, and its video-first algorithm rewards properly formatted Reels.

Facebook Reels:

  1. 1080 x 1920 px — 9:16 vertical
  2. 1080 x 1080 px — 1:1 square

Facebook Feed Video:

  1. 1080 x 566 px — 1.91:1 landscape
  2. 1080 x 1920 px — 16:9 vertical

Facebook Feed Post:

  1. 1080 x 1080 px — 1:1 square

The 1.91:1 landscape format is specifically used for Facebook link previews and is the aspect ratio most brands get wrong when sharing external content.

Instagram Dimensions

Instagram is the most format-sensitive platform in 2026. The algorithm actively downranks content that appears cropped, letterboxed, or low-resolution.

Instagram Reels:

  1. 1080 x 1920 px — 9:16 vertical (primary)
  2. 1080 x 1080 px — 1:1 square

Instagram Feed Post:

  1. 1080 x 1080 px — 1:1 square
  2. 1080 x 566 px — 1.91:1 landscape
  3. 1080 x 1440 px — 4:5 portrait (recommended for reach)
  4. 1080 x 1350 px — 4:5 portrait (carousel format)

The 4:5 Portrait Advantage:

Instagram's feed displays portrait content significantly larger than square content. In 2026, creators who have switched to 4:5 for all feed posts consistently report higher reach than those still posting square. If you only change one thing about your Instagram strategy, switch to 4:5 for feed posts.

Instagram Carousel:

  1. 1080 x 1350 px — 4:5 portrait

Every slide in a carousel must use the same dimensions. Mixing orientations within a carousel causes display errors.

LinkedIn Dimensions

LinkedIn rewards long-form professional content, and its image display is generous for portrait orientations.

LinkedIn Feed Post:

  1. 1080 x 1080 px — 1:1 square
  2. 1920 x 1080 px — 16:9 landscape (recommended)
  3. 1080 x 1350 px — 4:5 portrait (recommended for articles)

LinkedIn Article Cover Photo:

  1. 1080 x 1350 px — 4:5 portrait

LinkedIn's 4:5 article format displays as a large cover image that dominates the mobile feed. For thought leadership content, this is the highest-impact format available on the platform.

Threads Dimensions

Threads inherited Instagram's display infrastructure, which means the same dimension rules apply. However, Threads is currently optimized for faster consumption, which has shifted engagement toward square and landscape content over vertical.

Threads Feed Post:

  1. 1080 x 1080 px — 1:1 square
  2. 1080 x 566 px — 1.91:1 landscape
  3. 1080 x 1350 px — 4:5 portrait
  4. 1080 x 1920 px — 4:5 vertical video

Threads video is still finding its format identity. In 2026, square and 4:5 content performs better for organic reach, while 9:16 vertical is preferred for paid promotion.

X (Twitter) Dimensions

X has the smallest character-limited origins but has expanded into a media-heavy platform. The image display windows are non-standard compared to other platforms.

X Profile Photo:

  1. 400 x 400 px — 1:1 square (minimum, displayed at 200 x 200)

X Header Photo:

  1. 1500 x 500 px — 3:1 panoramic

X Feed Post:

  1. 1200 x 628 px — 1.91:1 landscape (displayed at 1200 x 675 in feed)
  2. 1200 x 1200 px — 1:1 square

X Video:

  1. 1600 x 900 px — 16:9 landscape

X does not natively support 9:16 vertical video in feed. If you cross-post a Reel to X, it will display with letterboxing or be reframed automatically. Upload native 16:9 or 1:1 video for optimal display.

YouTube Dimensions

YouTube remains the dominant platform for long-form content, and its Shorts format has become the primary vertical video competitor to Instagram Reels.

YouTube Long Form Video:

  1. 1920 x 1080 px — 16:9 landscape (standard HD)

YouTube Shorts:

  1. 1080 x 1920 px — 9:16 vertical

YouTube Video Thumbnail:

  1. 1280 x 720 px — 16:9 (recommended upload size; displayed at 1280 x 720)

YouTube Shorts use the exact same 9:16 vertical format as Instagram Reels and TikTok, making cross-posting straightforward. However, each platform compresses video differently — upload the highest resolution source and let each platform transcode.

YouTube Shorts thumbnails are auto-generated, unlike long-form videos where custom thumbnails drive click-through rate. For Shorts, the title and first 3 seconds of footage do the heavy lifting.

Quick Reference Table

| Platform | Format | Dimensions (px) | Aspect Ratio |

|---|---|---|---|

| Facebook | Reels | 1080 x 1920 | 9:16 |

| Facebook | Feed Post | 1080 x 1080 | 1:1 |

| Facebook | Feed Video | 1080 x 566 | 1.91:1 |

| Instagram | Reels | 1080 x 1920 | 9:16 |

| Instagram | Feed Post | 1080 x 1350 | 4:5 |

| Instagram | Carousel | 1080 x 1350 | 4:5 |

| LinkedIn | Feed Post | 1920 x 1080 | 16:9 |

| LinkedIn | Article | 1080 x 1350 | 4:5 |

| Threads | Feed Post | 1080 x 1080 | 1:1 |

| Threads | Video | 1080 x 1920 | 9:16 |

| X | Post | 1200 x 628 | 1.91:1 |

| X | Video | 1600 x 900 | 16:9 |

| YouTube | Long Form | 1920 x 1080 | 16:9 |

| YouTube | Shorts | 1080 x 1920 | 9:16 |


One Template to Rule Them All

If you want to simplify your content creation workflow, use 1080 x 1080 px (1:1) as your base template for static posts. Crop to 1080 x 1350 (4:5) for Instagram feed and LinkedIn articles. Crop to 1080 x 1920 (9:16) for Reels, Shorts, and Stories.

Starting from 1080 x 1080 means you always have a square master that scales cleanly in every direction without quality loss.

For businesses managing content across 5 or 6 platforms with 3 or 4 formats each, having one consistent workflow beats custom dimensions for every post. The time saved on formatting alone compounds across every piece of content you create.

Sanjay

Sanjay

Founder of InstantDM. Passionate about helping creators and brands scale their Instagram presence safely with compliant automation workflows.

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Frequently Asked Questions

1. What is the most important dimension to get right in 2026?

Instagram's 4:5 portrait feed post is the highest-impact format to get right. Portrait posts at 1080 x 1350 consistently outperform square posts in reach tests because they occupy significantly more screen real estate in the mobile feed. If you optimize nothing else, start there.

2. Should I create separate content for each platform?

No, but you should create a content hierarchy. Start with your highest-quality vertical video (1080 x 1920) for Reels and Shorts. From that footage, extract a square or 4:5 still frame for feed posts. From the original shoot, capture both 16:9 and 4:5 for LinkedIn and YouTube. One production session can yield content for every platform if you plan your shots.

3. Why do my Reels look cropped on X (Twitter)?

X does not support 9:16 vertical video in its feed. When you upload a Reel to X, it either letterboxes the content or reframes it automatically. For X specifically, export at 16:9 or 1:1 and upload natively. Do not rely on cross-posting for X — native uploads perform significantly better.

4. How do I manage all these dimensions across a team?

Use a social media management tool that includes a design library with pre-sized templates for every platform. Most creator teams maintain a Figma or Canva workspace with master templates for each dimension. For DMs and audience engagement across all these platforms, InstantDM centralizes responses in one inbox so you are not switching between six apps to manage inbound messages from your growing audience.

5. What resolution should I export at if a platform compresses my content anyway?

Always export at the maximum recommended resolution even if the platform compresses it. A 1080px upload compressed to 720px display still looks better than a 720px upload compressed to 480px. Never upscale — always start at or above the maximum recommended resolution and compress down if needed.

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