GitHub social preview / OG card on Slack unfurl
GitHub social preview / OG card header on Slack unfurl — what gets cut off
GitHub social preview / OG card renders your 1280×640px header at 800×400px on Slack unfurl. Here's what gets clipped and how to design around it.
Source size
1280 × 640px
Display size on Slack unfurl
800 × 400px
Device type
Desktop
Safe areas on Slack unfurl
Anything inside one of these zones is hidden by Slack unfurl UI.
| Region | Shape | Severity |
|---|---|---|
| Slack title strip | rect | warning |
Design tips for GitHub social preview / OG card on Slack unfurl
- •Anchor to the center. GitHub social preview / OG card crops differently on Slack unfurl than on desktop — centering keeps your headline, logo, or CTA visible everywhere.
- •Avoid the chrome. Status bar, Dynamic Island, and profile-picture overlays are fixed positions on Slack unfurl — design around them, not under them.
- •Export at 2×. Save at 2560×1280px so the image looks crisp on retina Slack unfurl screens.
- •Audit before posting. A 90-second Better Header audit shows you exactly what gets cut off on Slack unfurl and every other supported device.
See exactly what Slack unfurl hides on your header
Run a paid audit and Better Header renders your design on Slack unfurl and 3 other device profiles, with pixel-precise fix coordinates.
Refund if no device issues are found.