When your content is shared on social media, the platform fetches your Open Graph image to display as a visual preview card. A well-designed OG image can increase click-through rates by 2-3x compared to a page that shows a blank preview, a generic screenshot, or no image at all.
What Is an Open Graph Image?
Open Graph (OG) is a protocol developed by Facebook that allows web pages to control their appearance when shared on social platforms. The og:image meta tag specifies the image URL that Facebook, LinkedIn, Slack, Discord, iMessage, WhatsApp, and other apps display when your link is shared. The standard size is 1200x630px at a 1.91:1 aspect ratio.
How Social Platforms Use OG Images
- Facebook: displays as a large card below the post text
- LinkedIn: prominent image card shown in feed
- Twitter/X: summary_large_image card shows full-width preview
- Slack: compact thumbnail shown in message
- Discord: large embed preview when link is posted
- iMessage: small thumbnail preview in conversation
- WhatsApp: image thumbnail beside link title and description
CTR Optimisation: What Works
High-performing OG images share consistent design principles. The title text must be large enough to read at thumbnail size — the image displays at roughly 500x262px in most feeds. Brand colours and a recognisable logo build trust at a glance. A clear hierarchy guides the eye effectively.
- Bold, legible title text — minimum effective size is ~64px on the full-res image
- High contrast between text and background
- A recognisable brand element (logo, brand color, or domain name)
- Simple layouts — avoid cramming too much into the frame
- A clear value proposition visible without reading the link text
Social Sharing Psychology
Social feeds are high-velocity environments where users make share-or-scroll decisions in under a second. An OG image acts as a billboard — it must communicate the content's value at a glance. Text-only previews perform 40-60% worse than image previews in controlled click-through studies.
Preview Consistency Across Platforms
Different platforms display OG images at different aspect ratios. Facebook and LinkedIn crop to 1.91:1. Twitter large card uses roughly 2:1. Discord and Slack show the full image. Design your OG image so the critical content — title and logo — is in the central 80% of the frame, safe from all platform crops.