Crawler blocked
Right tags, bare URL? Bot protection, a WAF rule, robots.txt, or a login wall may be answering the preview crawler instead of your page.
Read the guide
CardScope
Guides
Fix the link card, whatever app it breaks in.
Start with the symptom. Each guide explains what the crawler actually reads, how to check it yourself with curl or view-source, and what to change. All 15 are free to read.
My card isn't showing at all
JavaScript / SPA previews
Preview crawlers read server HTML and don't run your bundle. Tags added by React, Vue, or a head manager after load never arrive.
Read the guideAbsolute OG image URL
Relative og:image paths break most crawlers. Use absolute https and verify before you rescrape.
Read the guideOG image format
SVG share images show no picture, WebP and AVIF are hit and miss, and a CDN can swap your PNG behind your back.
Read the guideMy card shows, but it's wrong or out of date
Clear OG cache
The live HTML is right but Slack, X, LinkedIn, Discord, or iMessage still show the old card. Verify tags, then rescrape.
Read the guideOG image size
Start with 1200×630 and a center safe zone. Crop notes for Facebook, X, LinkedIn, Slack, Discord, and WhatsApp.
Read the guideOG title & description
Soft length guidance, specific page titles, and how each platform truncates.
Read the guideog:url vs canonical
When og:url and rel=canonical disagree, scrapers pick the wrong page identity. Align both.
Read the guideTwitter Card types
summary is a small square thumb; summary_large_image is the big landscape card. twitter:card picks the layout.
Read the guideHow each app unfurls links
Slack vs Discord
Slack is Open Graph–first with a sidebar thumb. Discord uses twitter:card to pick a large embed.
Read the guideLinkedIn vs X
LinkedIn is Open Graph with a landscape card. X uses twitter:card to pick large vs small.
Read the guideiMessage link preview
Apple rich links are Open Graph–based. Missing og:image usually collapses to a plain URL.
Read the guideWhatsApp / Telegram
Chat unfurls lean on Open Graph. An absolute, publicly fetchable og:image matters most.
Read the guideFacebook / Meta
Meta reads Open Graph for link cards. Rescrape with the Sharing Debugger after you verify tags.
Read the guideAdding the tags
OG tags by framework
Copy-paste share tags for Next.js, Astro, Hugo, and WordPress, plus the traps that wipe your image.
Read the guideRather see it than read about it?
Paste the exact link you shared. CardScope fetches it from the edge like a crawler and shows the card on X, LinkedIn, Slack, Discord, and iMessage, plus a fix checklist. Previews and the checklist are Pro: $19 once via Stripe Checkout. No account. We parse HTML in memory and discard it.