Question 1

Why can I only see cookies for this website?

Accepted Answer

Browsers enforce the Same-Origin Policy: JavaScript on one site cannot read cookies, localStorage or sessionStorage belonging to a different site. This is a security feature, not a limitation of this tool. To inspect another site's storage, open this tool on that domain or use your browser's built-in DevTools (F12 → Application tab).

Question 2

What is the difference between cookies, localStorage and sessionStorage?

Accepted Answer

Cookies are sent with every HTTP request and have an expiration. localStorage persists until explicitly cleared and holds about 5MB. sessionStorage is like localStorage but clears when the tab closes. All three are per-origin (scheme + host + port).

Question 3

Is my data sent anywhere?

Accepted Answer

No. This tool reads storage APIs entirely in your browser using document.cookie, window.localStorage and window.sessionStorage. Nothing is uploaded to any server. You can safely use it to inspect any site you are logged into.

Question 4

How do I clear cookies or storage?

Accepted Answer

Use your browser DevTools (F12 → Application → Storage → Clear site data). You can also clear localStorage programmatically with localStorage.clear() and sessionStorage with sessionStorage.clear(). For cookies, set their expiration to a past date.