See how your link looks on Slack
Paste a URL to preview an approximation of the Slack unfurl and check the Open Graph tags on the page.
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Checks one page at a time.
This page checks Slack only. You can also check all 11 platforms at once.
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What Slack documents
Tags
Slack crawls the URL, looks for common OpenGraph and card metadata, and renders some micro-approximation of the content.
No metadata
If the web page does not include the necessary embedded data, the preview will not expand.
Frequently asked questions
Slack says that if the page does not include the necessary embedded data, the preview will not expand. Check that your page carries Open Graph or card metadata.
Slack has a URL debugging tool for unfurls, which it describes in its help article on sharing links and preview preferences.