Uploading a photo or video to social media seems simple—until your post gets awkwardly cropped or looks blurry. The culprit? Wrong aspect ratio. Every major platform—Instagram, TikTok, YouTube, Pinterest, Facebook, and X (Twitter)—has its own preferred dimensions. Getting it right can make your content look sharper, more professional, and more engaging.

Why Aspect Ratio Matters on Social Media

Aspect ratio is not just a tech detail—it directly impacts how your visuals appear. A poorly sized video can result in black bars, stretched frames, or worse, important content getting cut off. Each platform has different rules, so let’s break down the best aspect ratios for each.

Instagram Aspect Ratios

What aspect ratio is Instagram? It depends on the format:

• Square Post (Feed): 1:1 → 1080×1080 pixels
• Portrait Post: 4:5 → 1080×1350 pixels
• Landscape Post: 1.91:1 → 1080×566 pixels
• Instagram Reels: 9:16 → 1080×1920 pixels
• Stories: 9:16 → 1080×1920 pixels

For best results, go with 4:5 for feed photos and 9:16 for Reels and Stories.

TikTok Aspect Ratio

What is TikTok aspect ratio? The answer is simple: 9:16. This vertical format fits modern smartphones perfectly, and anything else might get cropped or look odd.

Tip: Always shoot vertically for TikTok and avoid borders that might get cut off on some screens.

YouTube Aspect Ratios

What aspect ratio is YouTube? YouTube’s native player is designed for 16:9. This is the standard widescreen ratio, and it is ideal for most uploads.

• Standard Video: 16:9 → 1920×1080 (Full HD)
• Shorts: 9:16 → 1080×1920 (vertical)
• Thumbnails: 16:9 → 1280×720 (minimum size)
• Banner: 16:9, but optimal size is 2560×1440

What aspect ratio is YouTube Shorts? YouTube Shorts use the 9:16 ratio—exactly like TikTok and Instagram Reels.

Pinterest Aspect Ratio

Pinterest favors vertical content that grabs attention. The recommended aspect ratio is 2:3, but it also supports:

• Standard Pins: 2:3 → 1000×1500 pixels
• Square Pins: 1:1 → 1000×1000 pixels
• Infographic Pins: Tall pins → 1:2.1 (avoid going taller or it may be cut off)

Facebook Aspect Ratios

What aspect ratio is Facebook? Facebook supports a mix of square, vertical, and horizontal media formats:

• Feed Image: 1.91:1 → 1200×628 pixels
• Square: 1:1 → 1080×1080 pixels
• Stories & Reels: 9:16 → 1080×1920 pixels
• Cover Photo: 820×312 pixels (but viewed differently on desktop and mobile)

For videos, 4:5 works well in the feed, while 9:16 is best for stories and Reels.

X (Twitter) Aspect Ratios

Formerly known as Twitter, X also has its preferences:

• Images in Tweets: 16:9 or 4:5 are most common
• Profile Banner: 3:1 → 1500×500 pixels
• Videos: 16:9 for landscape, 1:1 or 9:16 for vertical

Square images work well for mobile viewing, while 16:9 remains the default for embedded previews.

Quick Comparison Table

There is no one-size-fits-all when it comes to aspect ratios. A perfect TikTok video might look terrible on YouTube. The best strategy is to tailor your content per platform or use templates that keep your important elements safe inside visible zones.

Want to avoid the guesswork? Use our free Aspect Ratio Calculator to preview dimensions, convert formats, and make sure your content always fits just right.