W
WebThumb
Website thumbnail generation service
About this crawler
WebThumb is a web crawler identified by the regular-expression pattern WebThumb in the User-Agent request header. It is categorised as browser-automation. Use the regex above to detect, log, allow, or block WebThumb 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
- WebThumb
- Pattern
WebThumb- Tags
- browser-automation
- Added
- 2026/05/09
- Instances
- 1 known sample(s)
Sample User-Agent strings
Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.2.19) Gecko WebThumb/1.0
Block this crawler
robots.txt — disallow WebThumb:
User-agent: WebThumb
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} WebThumb [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "WebThumb") {
return 403;
}
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