A bookmarklet that opens an inspection panel on any website, showing which cookies are set, which tracking scripts are active, and whether Google Consent Mode v2 is in place — without leaving the page.

Step 1

Install the bookmarklet

Drag this to your browser's bookmarks bar:

🍪 Cookie Checker

Drag to your bookmarks bar — don't click

How to show your bookmarks bar
  • Chrome / Edge: ⌘ Shift B (Mac) or Ctrl Shift B (Windows)
  • Firefox: View → Toolbars → Bookmarks Toolbar
  • Safari: View → Show Favourites Bar

Alternatively, right-click the button above and choose Bookmark This Link.

Step 2

Run it on any website

  1. Visit the website you want to check
  2. Interact with the cookie consent banner — accept, reject, or make a custom selection
  3. Click Cookie Checker in your bookmarks bar

A panel slides in from the right of the screen. Click the × button or click the bookmarklet again to close it.

Tip: Use a private / incognito window for the cleanest results — cookies from previous visits won't interfere.

What it checks

🍪

Cookies

Reads all JavaScript-accessible cookies and classifies them against a database of known providers.

📡

Tracking scripts

Detects whether known analytics and advertising platforms are loaded and active on the page.

✅

Consent Mode v2

Checks whether Google Consent Mode v2 signals are present and what they are set to.

🏷️

Risk classification

Each item is flagged as high concern, worth checking, expected, or unclassified.

Limitations to know

  • HttpOnly cookies are set server-side and intentionally hidden from JavaScript — this tool cannot read them. To see them, open DevTools → Application → Cookies.
  • Results reflect the moment you run the check. Change your consent choice, then run it again to compare.
  • The database covers common platforms but is not exhaustive. Unclassified cookies should be cross-referenced against the site's own cookie policy.