Slack Link Unfurl Preview Tool
When you paste a URL in Slack, the platform "unfurls" it into an attachment-style card with a left border bar, favicon, site name, clickable title, description, and optional image. This tool previews exactly what that unfurl looks like.
Slack-Specific Notes
- Slack uses
og:site_name(with the favicon) as the bold header line. - The title is rendered as a clickable blue link.
- Images are shown inline below the description, capped at ~360px width.