Slack unfurled link image size (2026)

Specs at a glance

What to design for

Slack previews vary by client. Use one universal 1200x630 image and validate with a real share.

• Keep your headline large and readable on mobile.
• Leave a safe area around edges (avoid corner text).
• Use strong contrast; previews are often compressed.
• Use one clear focal point (logo, product, or keyword).

Implementation (meta tags)

The safest approach is to set Open Graph tags and (if you care about Twitter/X) Twitter tags too. If you need copy-paste tags, use Meta Tag Generator.

<meta property="og:title" content="Your title" />
<meta property="og:description" content="Your description" />
<meta property="og:image" content="https://example.com/og.png" />
<meta property="og:image:width" content="1200" />
<meta property="og:image:height" content="630" />

Validate and refresh caches

Validate the live URL first. If a platform still shows an old preview, it is usually caching.

• Validate tags: OG Validator
• Debug checklist: OG image not showing