Carbon Footprint
Calculate the environmental impact of any web page. Measure CO2 emissions per visit, page weight, and resource efficiency with 12 detailed checks.
CO2 per visitGreen rating12 checks~3 seconds
This tool analyzes the single URL you enter, not your entire website.
Analyzing... Measuring page weight and calculating carbon emissions
What We Check
12 checks covering page weight, media efficiency, caching, and hosting.
Page Weight
Total page weight is within acceptable range
HTML Size
HTML document size is reasonable
Compression
Server uses Gzip or Brotli compression
Image Count
Number of images on the page
Lazy Loading
Images use lazy loading
Modern Formats
Images use modern formats (WebP, AVIF)
Js Count
Number of JavaScript files loaded
Css Count
Number of CSS files loaded
No Autoplay Video
No autoplay video detected
Third Party Resources
Third-party resource usage is reasonable
Cache Headers
Cache headers are properly configured
Green Hosting
Hosted on a green energy provider
Frequently Asked Questions
Common questions about this tool.
How is website carbon footprint calculated?
We measure the total data transferred when loading a page and apply established models that estimate the energy consumed by data centers, networks, and end-user devices. The result is expressed in grams of CO2 per page view. A typical web page produces about 0.5g to 1.5g of CO2 per visit.
What is the biggest factor in a website's carbon footprint?
Page weight is the single largest factor. Images usually account for 50-70% of total page weight. Switching to modern formats like WebP or AVIF, enabling lazy loading, and compressing assets with Brotli are the most effective ways to reduce emissions.
What does green hosting mean?
Green hosting means the hosting provider powers its data centers with renewable energy sources or purchases verified carbon offsets. We cross-reference hosting information with the Green Web Foundation database to determine green hosting status.
Measure Your Site's Impact
Find out how much CO2 your website produces and get actionable steps to build a greener web.
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