GA Opt-Out (Per Site)

About

Block Google Analytics on the sites of your choosing, without losing visibility into what GA would have sent. Ideal for developers or analytics engineer who wants to verify a GA setup or use a site without polluting the data.

GA Opt-Out (Per Site) is a Chrome extension that intercepts Google Analytics measurement requests on a list of domains you control. The requests are redirected to a local empty response bundled inside the extension. Nothing leaves your browser, nothing reaches Google, but the original request stays fully visible in the DevTools Network panel so you can still inspect exactly what would have been measured.

WHAT IT DOES

• Lets you choose, per site, where Google Analytics is and isn't allowed to collect data.
• Redirects matching /g/collect requests to a local empty file inside the extension. The request resolves cleanly, so the GA tag on the page doesn't error.
• Keeps the original request URL, query string, and POST body visible in DevTools, so you can verify exactly what your analytics setup is trying to send.
• Logs each redirected & sunk request to the page's DevTools Console with the property ID and event name, prefixed with [GA Opt-Out] so you can filter for them.
• Counts sunk requests per tab via a small badge on the toolbar icon.
• Detects GA4 (tid=G-…) endpoints, so includes regional google-analytics.com subdomains and server-side GTM relays on custom domains (e.g. gtm.example.com).
• Does NOT capture server-side relays that change or obfuscate the GA payloads.

HOW TO USE IT

Click the toolbar icon while on a site you want to opt out from, then check "Block Google Analytics on this site". That's it.
Or open the Options page to manage the full list directly — one domain per line. Subdomains are included automatically (adding example.com also covers www.example.com, app.example.com, etc.).
Open DevTools → Network on a blocked site to see the original GA requests with their full payloads. Open DevTools → Console to see a one-line summary for each.

WHAT IT DOES NOT BLOCK

This extension is intentionally narrow. It does not:
• Block GTM or the GA library itself (gtag.js, gtm.js) from loading, only the measurement requests.
• Block remarketing pings (ga-audiences)

PRIVACY

This extension does not collect, transmit, or share any data. Your site list is held in Chrome's storage.sync area; if you're signed into Chrome with sync enabled, it syncs across your own devices via Google's standard mechanism, and is never visible to the extension author or any third party. Full privacy policy linked from the listing.

OPEN SOURCE

Source code, issue tracker, and MIT license: https://github.com/jhpacker/ga-optout-persite