OG image dimensions: the exact sizes for every platform

One image. Every platform. Except each platform crops it slightly differently, displays it at a different size, and has its own file size limit.

Here are the exact specifications — no padding, no "approximately."

The universal starting point: 1200×630 pixels

Design your OG image at 1200×630 pixels. That's a 1.91:1 aspect ratio.

This is the standard used by Twitter, LinkedIn, Facebook, and most other platforms as their base format. If you only remember one number, remember 1200×630.

Why this specific size? Facebook created the Open Graph protocol in 2010 and set 1200×630 as the recommended resolution. Everyone else followed.

Platform-by-platform breakdown

Twitter / X

Twitter has two card types. The one you want is summary_large_image — a full-width image that stops the scroll. Without explicitly setting it, you get a small square thumbnail in the corner.

You need this tag:

<meta name="twitter:card" content="summary_large_image" />

Without it, Twitter falls back to summary — the small card. Same image, vastly different display.

Twitter crops to 2:1 for large image cards. At 1200×630 (which is 1.91:1), the image is very slightly letterboxed, but in practice this is imperceptible.

LinkedIn

LinkedIn is the most strict about minimum dimensions. Below 1200×627, it will not show the image at all — you'll get a plain text link card instead.

LinkedIn also caches aggressively. If you update your OG image, you need to visit their Post Inspector and paste your URL to force a refresh. Otherwise the old image persists for days.

Facebook

Facebook is the most forgiving. It will display images that are well below the minimum spec — just at a lower quality. For any serious use, design at 1200×630.

Facebook also has the Sharing Debugger for clearing its cache.

Slack

Slack renders OG images inline in messages. It doesn't crop aggressively — it preserves the aspect ratio of whatever you've set. 1200×630 scales down gracefully.

The thing to know about Slack: image previews are prominent. A link shared in a busy channel with a well-designed OG image stands out significantly. Design your image to be readable at around 400px wide.

iMessage and WhatsApp

Both platforms read standard og:image tags and show compact previews. The image is small — design for clarity, not complexity. Bold text, clear logo, one idea.

iMessage shows a square-ish crop on iOS. If your subject is centred in the 1200×630 frame, it survives this crop fine.

File format and size recommendations

Use JPG for photos or image-heavy backgrounds. Use PNG for text-heavy designs, logos, or anything with transparency (though most platforms don't support transparent OG images — use a solid background).

File size matters more than most people think. A 2MB OG image loads noticeably slowly on mobile. Target under 300KB. At 1200×630, a quality-80 JPG is usually around 150–250KB.

The one-line summary

Design at 1200×630 pixels, keep the important content away from the edges, and keep the file under 300KB. That covers you on every major platform.