LocalStorage persists data indefinitely until explicitly cleared by the user or the web application. Data survives browser restarts and tab closures. SessionStorage, on the other hand, only persists data for the duration of the page session — it's cleared when the tab or browser window is closed. Both provide up to ~5-10MB of storage per origin in most modern browsers, but LocalStorage is often the preferred choice for long-term client-side data.

Storage limits vary by browser: Chrome & Edge allow up to 60% of available disk space per origin, Firefox allows up to 50% (capped at ~2GB per origin), and Safari typically limits storage to around 1GB per origin. The total quota shown above comes from the navigator.storage.estimate() API and reflects the combined usage of LocalStorage, SessionStorage, IndexedDB, Cache API, and Service Worker caches.

IndexedDB databases are only listed if they have been created by a web application on this specific origin (domain). If no site has created an IndexedDB database here, the list will be empty. Additionally, some older browsers may not support the indexedDB.databases() method. The total usage from navigator.storage.estimate() still includes IndexedDB data even if individual databases can't be enumerated.

No. Clearing LocalStorage only removes data stored by websites using the Web Storage API. It does not affect browser-saved passwords, bookmarks, browsing history, or autofill data. Those are managed separately in your browser settings. LocalStorage is purely for web application data like user preferences, session tokens, and cached JSON.

In private or incognito mode, most browsers still allow LocalStorage and SessionStorage to function normally during the session, but all data is automatically erased when the private window is closed. IndexedDB may have reduced quotas or be entirely unavailable depending on the browser. The storage quota API may also report different limits in private mode.

In most browsers, the storage quota is automatically managed and cannot be manually increased by users. However, web applications can request additional persistent storage using the navigator.storage.persist() API, which may prompt the user for permission. If granted, the browser may allocate more space and protect the data from automatic eviction when disk space is low.