GTmetrix
Performance testing tool analyzing page speed and optimization recommendations
About this crawler
GTmetrix is a web crawler identified by the regular-expression pattern GTmetrix in the User-Agent request header. It is categorised as monitoring. Use the regex above to detect, log, allow, or block GTmetrix traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.065%
Technical details
- Name
- GTmetrix
- Pattern
GTmetrix- Tags
- monitoring
- Reference
- https://gtmetrix.com/
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36 GTmetrix
Block this crawler
robots.txt — disallow GTmetrix:
User-agent: GTmetrix
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} GTmetrix [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "GTmetrix") {
return 403;
}
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