What is the Slack Link Preview tool?

It's a free tool that fetches Open Graph meta tags from any URL and renders a live Slack-style unfurl preview. You see exactly how your link will unfurl in Slack — with the colored left border, site name, bold title, description, and inline image — before sharing in channels and DMs.

What OG tags does Slack use for unfurls?

Slack uses og:title, og:description, og:image, og:url, og:type, and og:site_name. The og:image appears as a small thumbnail. og:site_name is displayed as the source. Slack also supports oEmbed for richer previews from certain domains.

What image size works best for Slack unfurls?

Slack displays a small thumbnail image (approximately 72×72px to 360×360px depending on the context). A 1200×630px OG image works as a good source since Slack scales it down. Use JPG or PNG format under 8MB.

Does Slack cache link previews?

Yes, Slack caches unfurl data for a period. If you update your OG tags, old previews may persist. Slack refreshes caches periodically, but there's no manual clear-cache tool. You can try adding a query parameter to the URL to force a fresh fetch.

💬 Slack Link Preview

Name: Slack Link Preview
Author: ToolStand

Preview exactly how your link will unfurl in Slack — fetch OG meta tags and see the compact Slack unfurl layout

⏳ Fetching Open Graph tags...

📌 Embed This Tool

Add the Slack Link Preview to your website for free.

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What Is the Slack Link Preview?

Slack Link Preview is a free, browser-based SEO tool that fetches Open Graph meta tags from any URL and renders a live Slack-style unfurl preview. It shows exactly how your link will unfurl in Slack — the colored left border, site name, bold title, description, and thumbnail image — before sharing in channels and DMs. No downloads, no sign-ups.

Key Features

Authentic Slack Unfurl: Renders the exact Slack unfurl layout — compact card with a colored left border, site name, bold title link, description, and image thumbnail.
Complete OG Tag Audit: Displays all Open Graph tags Slack uses: og:title, og:description, og:image, og:url, og:type, og:site_name, and more.
Thumbnail Preview: Shows the og:image as Slack would — as a small 72×72px thumbnail positioned to the right of the text.
Missing Tag Detection: Highlights missing or incomplete OG tags so you can fix them before sharing on Slack.

📋 When to Use the Slack Link Preview

Use before sharing links in Slack workspaces, channels, or direct messages. Essential for teams, product managers, marketers, and developers who want to ensure their shared links unfurl with professional, engaging previews that drive clicks in a workplace context.

⚙️ How the Slack Link Preview Works

Enter any URL and the tool fetches the page's HTML via ToolStand's proxy. It extracts all og:* meta tags and renders a compact Slack-style unfurl — white card with a gray left border, site name in small bold text at top, og:title as a bold link in Slack blue (#1264a3), description in gray, and the og:image as a small rounded thumbnail on the right. This matches Slack's actual link unfurl rendering.

How to Use the Slack Link Preview

Enter a URL — paste any webpage URL you want to preview as a Slack unfurl.
Click Preview — the tool fetches and parses all OG meta tags from the page.
Review the unfurl — see the live Slack-style preview with colored border, site name, title, description, and thumbnail.
Audit missing tags — check the tag table for any missing OG meta tags and fix them.

Frequently Asked Questions

How does Slack unfurl links?

Slack fetches the og:title, og:description, og:image, and og:site_name from any URL shared in a channel or DM. It renders them as a compact card with a gray left border, the site name at top, the title as a bold link, description text below, and the image as a small thumbnail on the right side. This is called 'link unfurling' in Slack.

What OG tags are most important for Slack unfurls?

og:title (bold link text), og:description (body text), og:image (thumbnail on the right), and og:site_name (source label at top). Slack also respects twitter:card, twitter:title, and twitter:description as fallbacks if OG tags are missing.

What happens if I don't have OG tags for Slack?

Without OG tags, Slack will still unfurl the link but with limited information — usually just the page's HTML <title> and the URL. The preview will not include a description or image. Always include complete OG tags for the best Slack unfurl experience.

Does Slack support oEmbed?

Yes, Slack supports oEmbed for richer unfurls from certain domains. It also uses Twitter Card tags (twitter:card, twitter:title, twitter:description, twitter:image) as fallbacks. However, Open Graph tags are the most reliable cross-platform approach.

Can I prevent Slack from unfurling my link?

Yes, you can add a meta tag <meta name="slack-app-id" content="0"> to prevent unfurling. Alternatively, users can wrap the URL in angle brackets like <https://example.com> to prevent it from unfurling in that specific message.

Is this Slack Link Preview tool free?

Yes, completely free. No sign-up, no API keys, no limits on URL checks.