Developer Diagnostics Tools

Diagnostics

Inspect webpage Open Graph tags, test social crawler compatibility, and diagnose social card image dimensions and crops across major platforms.

Metadata & Crawlers

Page Metadata Inspector

Inspect URL Open Graph tags, Twitter Card tags, canonical links, social crawler compatibility, and actionable diagnostics for any live webpage.

What it checks:

  • Multi-crawler simulation: Toggle between Generic, Facebook, X/Twitter, LinkedIn, and Slack crawler User-Agents.
  • Automated diagnostics: Detects missing og:title, og:image, relative URLs, or missing image alt attributes.
  • Copy-ready fixes: Provides copyable HTML meta snippet fixes for every detected issue.
  • Fetch audit: Measures response time, redirect chains, HTML payload size, and HTTP response headers.
Open Page Inspector
Image & Cache

Image Header & Crop Inspector

Inspect Open Graph image headers, byte sizes, dimensions, aspect ratios, cache performance, and multi-frame social preview crops.

What it checks:

  • Multi-frame crop preview: Simulate how platforms display the image across 1.91:1 (Facebook/LinkedIn), 2:1 (Twitter/X), and 1:1 (mobile) frames.
  • Safe area overlay: Verify that titles, logos, and focal subjects stay inside the recommended 80% inner content safe zone.
  • Byte size & limits: Checks against crawler payload thresholds (warns over 1 MB, flags errors over 5 MB).
  • Cache headers: Analyzes Cache-Control and CF-Cache-Status headers for optimal edge latency.
Open Image Inspector

Related Documentation & Guides

Edge & Crawler Caching

Learn how social network edge caches behave, how to use cache-busting v=... parameters, and platform re-scraping intervals.

Error Code Reference

Full catalog of all diagnostic codes, SSRF defense rules, and API error responses.

Troubleshooting Social Cards

Step-by-step resolution for cards not updating, image aspect distortions, redirect limits, and robots.txt blocks.