This translation has not been editorially reviewed yet. The German version is authoritative. German version →

CO₂ & sustainability: what exactly is checked

Page weight · transfer · SWDM · green web hosting · image sizes (co2-v2). Every subtopic leads to its checkpoints with weight and explanation; the list comes from the audit engine itself.

To the service page “CO₂ & sustainability” →

Frequent questions about CO₂ & sustainability

How is the CO2 number calculated?

According to the Sustainable Web Design Model: the amount of data transmitted is used to estimate the energy demand and CO2 emissions per call. If the hosting runs with green electricity, the assigned factor decreases. It is an understandable estimate, not a certified balance sheet.

Where does the information on green energy hosting come from?

From the public database of the Green Web Foundation. If your provider is not listed there as green, we show this as "not proven green" - this may also mean that the proof has not yet been filed.

Do you accompany the change to green energy hosting?

Yes, as an additional service for each tested site: inventory of today’s hosting, move to a server with green electricity, re-measurement in this audit area. The price is called the price page; the booking follows as soon as the first green server is available.

Good to know

The amount of data actually transmitted is measured in the real browser.
The CO2 value is a reasonable estimate, not a certified balance sheet.
Green Energy hosting comes from the Green Web Foundation database.
When certifying, real call numbers can refine the extrapolation.
The partial seal is valid for 12 months and can be publicly verified at any time.

CO₂ & sustainability: what exactly is checked

Good to know

Relevant standards