Live checker
Test a URL in the Slack Link Preview Checker
Use LinkPeek as a Slack link preview checker when a URL unfurls without an image, shows the wrong title, or misses the site name that makes the card feel branded. Slack previews rely on crawler-readable metadata and can fail silently when tags are too deep in HTML, images are blocked, or site-name data is missing. LinkPeek renders a Slack-style card and surfaces the metadata issues that need attention.
Check the Slack unfurl before sending the message
Slack links are often shared in team channels, customer communities, sales rooms, and launch war rooms. A broken unfurl makes the link harder to scan and can hide the most important context.
- Preview the Slack-style card image, title, description, and source label
- Confirm og:site_name gives Slack a clean brand anchor
- Catch missing or weak Open Graph tags before posting in a channel
Find crawler and HTML-depth issues
Slackbot reads page HTML quickly and can miss metadata when the head is bloated or blocked. LinkPeek helps identify whether the important tags are visible and whether image URLs are directly fetchable.
- Check for crawler access problems and blocked images
- Keep Open Graph tags high in the document head
- Avoid redirect chains for page and image URLs
Use Slack preview QA for internal launches
Many launches begin inside Slack before they reach public social feeds. Checking the Slack unfurl helps teams spot broken cards in the same environment where stakeholders discuss the release.
- Preview product updates before internal announcements
- Check documentation and changelog links before sharing them with customers
- Use bulk scans for launch lists that include many Slack-shared URLs
How to use this slack link preview checker
- 1Paste the URL into LinkPeek.
- 2Open the Slack preview card.
- 3Review image, title, description, domain, and site name.
- 4Fix missing Open Graph tags, blocked images, or bloated head markup.
- 5Retest before posting the URL in Slack.
Common issues this page helps debug
Slack shows no image
The og:image URL may be missing, blocked, too slow, redirect-heavy, or inaccessible to Slackbot.
Slack shows a weak source label
Add og:site_name so Slack can show a clear brand label above the preview.
Slackbot misses tags
Keep critical Open Graph tags near the top of the head and avoid large inline assets before metadata.
Slack keeps an old unfurl
Slack caches previews. Verify the source is fixed, then retest with a versioned URL if necessary.
Frequently asked questions
What is a Slack link preview checker?
A Slack link preview checker shows how a URL will unfurl in Slack and audits the Open Graph metadata Slackbot reads.
Why is my Slack link preview missing an image?
The page may be missing og:image, blocking Slackbot, using a redirect-heavy image URL, or placing metadata too deep in the HTML.
Does Slack use Open Graph tags?
Yes. Slack uses Open Graph metadata including title, description, image, and site name when building link unfurls.
Can LinkPeek test Slack previews with other platforms?
Yes. LinkPeek shows Slack alongside WhatsApp, LinkedIn, X, Discord, and Instagram-style previews.