Privacy policy

Last updated 11 November 2026

RenderFox is a free Chrome extension that shows how much of a web page AI assistants and search crawlers can read. It's made by Suganthan Mohanadasan. Your pages stay in your browser, and none of them are ever sent to me.

What RenderFox reads

RenderFox does nothing until you click its icon on a page. When you click, it uses Chrome's activeTab permission to read two things from that tab:

• the page's HTML as your browser has built it, including the text of its main headline, so it can be compared with what a crawler receives
• the page's address, so RenderFox can ask the website for the same page

It doesn't read any other tab, your browsing history, or anything you type.

What it does with that

• It asks the website for the same address, once for each crawler you check, using that crawler's published identity. These requests go straight from your browser to that website, and they don't carry your cookies.
• It compares your copy of the page with each response and shows you the result in the popup and in a report tab.
• To draw the two versions of the page in the report, your browser loads the page's stylesheets, images and fonts from that website. Those requests do carry your cookies for that website, so the site sees a normal visit from you. The report says this too.

What it keeps

Nothing is saved. The copy of the page and the crawlers' responses are held in memory while the popup and the report need them, and they're gone shortly after you close the report. RenderFox doesn't write anything to your disk, and it doesn't use Chrome storage, cookies or local storage.

What leaves your browser

Only the requests described above, to the website you're checking. There's no RenderFox server, and the extension has no account, analytics, advertising or tracking. It doesn't sell or share data, because it never collects any. The links in the extension's footer are ordinary links that open only if you click them.

Permissions

• activeTab lets RenderFox read the tab you click it on, and only that tab.
• scripting runs the one function that copies the page from that tab.
• declarativeNetRequestWithHostAccess sets the crawler's identity on RenderFox's own requests. It never touches your browsing.

Limited Use

RenderFox's use of information received through Chrome's APIs adheres to the Chrome Web Store User Data Policy, including the Limited Use requirements. Data is used only to provide the single purpose described above. It isn't sold or transferred to third parties, and it isn't used for advertising or to determine creditworthiness.

This website

This website doesn't set cookies or run analytics. It's hosted on Cloudflare, which keeps the standard technical logs any web host keeps.

Changes

If this policy changes, the date at the top of this page changes with it.

Contact

Questions about this policy go to sugan@suganthan.com.