When it comes to Instagram, getting the image size right is key to creating visually appealing posts that stand out. Whether you’re posting a photo on your feed or a story, using the correct Instagram image size ensures your content looks professional and is optimized for viewing on all devices. For feed posts, the ideal size is 1080px by 1080px for square images, 1080px by 1350px for vertical, and 1080px by 566px for horizontal posts. Instagram Stories should be sized to 1080px by 1920px.