Privacy Policy
Last updated: 6 July 2026
PageLens is a Chrome extension that estimates the carbon footprint of the web page you are viewing. We designed it to work without collecting your personal data. This policy explains exactly what the extension accesses and what — if anything — leaves your device.
What the extension accesses
When you click the PageLens toolbar icon on a page, the extension reads:
- the address (URL) of the active tab, to identify the site and its hosting domain;
- the resource timing of the page — the sizes and types of the files it loaded — to calculate page weight and emissions.
This happens only for the tab that is active when you invoke PageLens, and only when you invoke it.
What leaves your device
The only information sent off your device is the
hostname of the site you are analyzing (for example
example.com). It is sent to
The Green Web Foundation
greencheck API to determine whether the site is hosted on green energy.
No page content, full URLs, browsing history, or personal data is transmitted. The extension contains no analytics, no advertising, and no third-party trackers.
What is stored
PageLens stores a small amount of data locally in your browser using the Chrome Storage API:
- your “monthly visits” setting, used for the yearly carbon estimate;
- cached green-hosting results, to avoid repeat lookups.
This data stays in your browser and is never uploaded to us.
Data sharing & sale
We do not collect, store, share, or sell any personal information.
This website
This policy describes the PageLens browser extension. The PageLens website (pagelens.iamjarl.com) uses Umami — a privacy-friendly, cookieless analytics tool — to measure visits in aggregate. It sets no cookies and does not collect personal data.
Changes to this policy
If this policy changes, the updated version will be published on this page with a new “last updated” date.
Contact
Questions about your privacy? Email us at support@iamjarl.com.