PageLens

About

PageLens estimates the environmental impact of the web page you're viewing and
turns it into a simple, actionable A–F Eco Score.

Click the toolbar icon on any page to see:

• Eco Score — one 0–100 score (graded A–F) blending carbon, page weight, green
  hosting and best practices.
• Carbon estimate — grams of CO₂ per view plus a yearly projection, using CO2.js
  (Sustainable Web Design model) from The Green Web Foundation.
• Green hosting — whether the site runs on green energy, via the Green Web
  Foundation greencheck.
• Page-weight breakdown — transferred bytes by type (HTML, JS, CSS, images,
  fonts, video) and third-party share.
• Recommendations — a prioritized list of what to fix first: oversized images,
  heavy JavaScript, autoplay video, large CSS, and more.

PageLens gives an actionable estimate, not an exact measurement, and is
transparent about how the score is calculated.

Built for developers, designers, agencies and sustainability teams.

Privacy: PageLens collects no personal data and has no trackers. Only the
hostname of the site you analyze is sent to the Green Web Foundation to check
green hosting. See the privacy policy for details.