https://google.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
88
GRADE
B
FIX
1
REVIEW
2
PASS
4
INFO
1
Checks
84 PASS 2 REVIEW 1 FIX
DTransfer EfficiencyAction60% efficientFIX
Transfer Efficiency
Action60% efficient
60% efficient
Warning::
Transfer efficiency: 60%
An estimated 325 KB (40%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 325 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
Total waste: 325 KB (40% of page weight)
Unused JS 325 KB
0.08g unnecessary CO2 per visit
Actual transfer 808 KB
Theoretical minimum 483 KB
Potential savings 325 KB (0.08g CO2)
See Deep Analysis sections above for specific optimizations.
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Google Web Server uses renewable energy
Info::
Google Web Server: Verified by the Green Web Foundation
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green Hosting✓ Green Hosted
Hosting Google Web Server✓CDN Not identified✗
Google Web Server: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
A+CO2 Per Page Load0.19g CO2 per viewPASS
CO2 Per Page Load
0.19g CO2 per view
0.19g CO2 per view
Info::
0.19g CO2 per page view
This page transfers 0.8 MB, producing an estimated 0.19g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.04g, end-user device 0.14g.
Got: 0.19g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 22.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 22.4 kg of CO2 annually — equivalent to charging 2804 smartphones.
Info::
Green hosting reduces data center emissions
0.19g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.8 MB
Your site
0.19g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.04g
End-user device
0.14g
At 10,000 monthly views: Monthly: 1.9 kg · Annual: 22.4 kg · ≈ 2804 smartphone charges
A+Repeat Visit Weight91% cachedPASS
Repeat Visit Weight
91% cached
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 72 KB (vs 808 KB first visit). 46 of 47 resources are served from browser cache, saving 0.17g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.19g)
First visit
808 KB
Repeat visit
72 KB
91% reduction on repeat visits
Saving 0.17g CO2 per returning visitor
46 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.19g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.19g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 69% cleaner ✓
vs Target 63% cleaner ✓
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Google Cloud
Image Optimization11 images, 0 KB total, 0 KB wastedINFO
Image Optimization
11 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
11
Total Size
0 KB
Oversized
1
10 missing alt text 11 missing dimensions 9 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.