Cookie and Storage Checker

Find out whether your browser lets websites use cookies and the main storage mechanisms: localStorage, sessionStorage, IndexedDB and the Cache API. Each one is tested by writing a small test value, reading it back and deleting it straight away, and the page also shows how much storage space the browser allows this site and whether it is marked as persistent.

Device & Browser Info Runs in your browser

Check Cookies and Browser Storage

JavaScript is required. This tool runs in your browser, so please enable JavaScript to use it. The instructions below are still available.

How to Use the Cookie & Storage Check

Open the page; the checks run automatically.
Read the summary and the table. Each row says Working, Blocked or Not supported, with a note.
After changing a browser or privacy setting, press Check again.

About This Tool

People troubleshooting sign-in or shopping-cart problems, support staff checking a customer's settings, and developers testing private browsing modes.

Input: Nothing to enter · Output: Availability of each storage type.

Features and Limitations

Features

Real write-read-delete tests instead of only checking navigator.cookieEnabled.
Covers cookies, localStorage, sessionStorage, IndexedDB, Cache API and the Storage Manager quota.
Shows usage and quota in readable units and whether storage is persistent.
Removes every test value immediately; nothing is left behind.

Limitations

Only first-party storage for this site can be tested; whether third-party cookies are blocked on other sites cannot be checked from a single page.
Private windows often allow storage but clear it when closed; this cannot be detected reliably.
Quota figures are browser estimates and may be rounded on purpose.
Results are computed in your browser; nothing you enter is sent to a server.

Frequently Asked Questions

Does this page set cookies on my device?

Only for a moment: it writes one test cookie and immediately deletes it, and does the same for each storage type. Nothing is kept.

Cookies are enabled but a website still says they are blocked. Why?

That site may depend on third-party cookies (set by another domain inside it), which many browsers now block by default. This checker tests first-party cookies only.

What is the difference between localStorage and sessionStorage?

localStorage keeps data until it is cleared; sessionStorage keeps it only until the tab is closed. Both store small amounts of text per website.

What does persistent storage mean?

Normally a browser may delete a site's data when the disk is nearly full. Persistent storage protects it from automatic clearing. Sites must request it, and this page only reports the current state.