Recommended dimensions

For summary_large_image cards: 1200 x 600 pixels at a 2:1 aspect ratio. This gives you the largest card in the timeline.

For summary cards: 144 x 144px minimum, but aim for at least 400 x 400px for sharp display on retina screens.

Cropping

Twitter center-crops to fit the card format. For summary_large_image, that’s a 2:1 crop from the center, and anything outside that ratio gets trimmed from the edges. Keep important content in the center 80% of the image.

Size limits

• Minimum: 144 x 144px (anything smaller is ignored)
• Max file size: 5 MB
• Max dimensions: 4096 x 4096px

Outside these bounds, the card falls back to text-only with no image.

Supported formats

JPEG, PNG, GIF (first frame only), and WebP.

Twitter re-encodes everything as JPEG regardless of source format. Even a clean PNG gets re-compressed, which can introduce artifacts. Use high-quality source images and avoid thin text or fine detail that won’t survive the re-encoding.

Image URL requirements

The twitter:image (or og:image) URL must be:

• An absolute URL (not relative)
• Accessible to Twitterbot without auth
• Served over HTTPS
• Not behind redirects requiring cookies or JavaScript