| Image size | 1200x630px |
| Aspect ratio | 1.9:1 |
| Max file size | 5 MB |
| Formats | image/jpeg, image/png, image/webp, image/gif |
| User-Agent | facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php) |
Threads is built on Meta’s shared infrastructure, so it uses the same facebookexternalhit crawler and Open Graph tag processing as Facebook and Instagram. When someone shares a link on Threads, the crawler fetches your page and builds a card-style preview from your OG meta tags.
This guide covers how the Threads crawler works, which tags you need, image sizing, cache behavior, and the most common issues that prevent previews from displaying correctly.
Understanding facebookexternalhit: the shared Meta crawler behind Threads link previews
Which meta tags Threads uses and how it falls back when tags are missing
Image sizes, aspect ratios, and format requirements for Threads link previews
How Threads caches link previews and how to force a refresh
Troubleshooting the most frequent Threads link preview problems
Enter your site's URL to see how it looks on Threads.