Measured, not guessed
We load your page with Google Lighthouse and measure exactly what gets transferred: images, scripts, fonts and all.
How much CO2 does
your website emit?
Scan any website and get a transparent, science-backed estimate of its carbon emissions per page view, graded A+ to F on a fixed scale.
An open model
Emissions are estimated with the Sustainable Web Design model v4, the same open methodology used across the industry.
Fair, fixed grades
Grades map to fixed CO2 thresholds. Your A stays an A. It can't be pushed down by other sites scanning better.
Green hosting counts
Hosted on renewable energy? We check The Green Web Foundation's registry and your score benefits.
The problem
The internet has a very real footprint. Every page view moves data through networks and data centres that run around the clock, and digital technology is estimated to account for a few percent of global greenhouse gas emissions, in the same league as the aviation industry.
That figure keeps growing as our appetite for data increases. Heavier pages, bigger scripts, autoplaying video: it all adds up, one request at a time.
The solution (well, part of it)
When a website loads, the energy consumed is closely tied to the amount of data transferred. Trim the page weight (leaner images, less JavaScript, sensible caching) and you directly trim its emissions.
Pair that with a host running on renewable energy and your site's footprint shrinks dramatically. Read more about how we measure it.
Why it matters
of the world's electricity was consumed by data centres in 2024, and demand is growing fast.
Source: IEAadditional deaths per year are expected between 2030 and 2050 due to climate change.
Source: WHOof the world's primary energy comes from renewable sources. The rest still burns carbon.
Source: Our World in Data