LT
link_thumbnailer
Ruby link thumbnail generator
About this crawler
link_thumbnailer is a web crawler identified by the regular-expression pattern link_thumbnailer in the User-Agent request header. It is categorised as ai-fetcher. Use the regex above to detect, log, allow, or block link_thumbnailer traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
No block-rate data for this crawler.
Technical details
- Name
- link_thumbnailer
- Pattern
link_thumbnailer- Tags
- ai-fetcher
- Added
- 2026/05/09
- Instances
- 1 known sample(s)
Sample User-Agent strings
Ruby, link_thumbnailer
Block this crawler
robots.txt — disallow link_thumbnailer:
User-agent: link_thumbnailer
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} link_thumbnailer [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "link_thumbnailer") {
return 403;
}
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