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Measure the HTML and header size of a page

harmlessSEO checksdebian, ubuntu
Adjust the values, the command updates live
user@server
curl -s -o /dev/null -w 'Status: %{http_code}  Header: %{size_header} Bytes  HTML: %{size_download} Bytes\n' https://example.com/

Measures only the HTML document, without images, CSS and JavaScript. Unusually large HTML files are often caused by inline CSS from page builders, embedded SVGs or Base64 images, and they slow down parsing and rendering. Crawlers also only process a limited portion of very large documents.

Note: Without --compressed, curl does not request compression, so the uncompressed size is measured. Very large headers point to too many or too long cookies.

Also searched as

  • how big is the html of a page
  • check page size curl
  • html document too large
  • measure http header size

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