Live deterministic tool
Bundle Size Checker
Fetch same-origin scripts and stylesheets referenced by a page and estimate sampled transfer size.
What this checks
HTML size
Script/style asset sample
Sampled transfer size
Asset fetch failures
FAQ
Does this return real evidence?
Yes. The tool runs deterministic network, parser, DNS, or TLS checks against the submitted public target.
Will results be mocked?
No. Tools either run real checks or return a clear unavailable state.