The internet has a footprint

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.

Try:
1,191,832 Websites scanned
0.88 g Avg CO2 per view
7.26 MB Avg page weight
82% Green hosted
How it works

Measured, transparent, fair

No black box: we load your page in a real browser, measure every byte that travels, and run it through an open, peer-reviewed emissions model.

  • Measured, not guessed. Google Lighthouse records exactly what gets transferred.
  • An open model. Sustainable Web Design v4, used across the industry.
  • Green hosting counts. Verified against The Green Web Foundation's registry.
Read the methodology
Fair grading

Your A stays an A

Grades map to fixed CO2 thresholds from real-world web data. Each segment below is as wide as its true share of the web — half of all pages land in F.

Fixed thresholds from the Sustainable Web Design digital carbon ratings. Your grade can never be pushed down because other sites scanned better.

The problem

Every page view adds up

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.

Illustration of people around a laptop and a recycling globe
The solution (well, part of it)

Less data, less carbon

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.

Illustration of two people walking among trees
Why it matters

The bigger picture

1.5%

of the world's electricity was consumed by data centres in 2024, and demand is growing fast.

Source: IEA
250,000

additional deaths per year are expected between 2030 and 2050 due to climate change.

Source: WHO
Badges & API

Show it off, build on it

Every scanned site gets a live SVG badge that always reflects its latest result. No JavaScript, no tracking, just an image.

Want the raw numbers? The JSON API exposes everything the scanner knows: emissions, grades, transfer breakdowns and recommendations.

Read the API docs
Free, no sign-up

Ready to find out?

Scan your website and get a graded, science-backed carbon report in about a minute.