Answer

What are the storage limits for a PWA?

Short answer

A PWA typically gets 60% of the device disk space on Chrome and Edge (up to hundreds of GB), 20% of total quota on Firefox, and around 1 GB on Safari. Cache Storage, IndexedDB and OPFS share the same quota. Browsers evict least-recently-used origins under pressure unless the site requests persistent storage.

By InstantPWA engineering·Reviewed July 7, 2026

Per-browser limits

Chrome/Edge: 60% of disk. Firefox: 20% of free space with a 10 GB per-group cap. Safari 17+: ~1 GB per origin with promptless eviction after 7 days of inactivity.

Check the current quota

Call navigator.storage.estimate() — it returns { quota, usage } in bytes.

Request persistent storage

navigator.storage.persist() returns true if the browser grants it. Persistent storage is not evicted under pressure and is only cleared when the user explicitly deletes site data.

Sources

MDN — Storage quotas and eviction criteria

Do PWAs work offline?

PWAs can work offline, but only for content their service worker has explicitly cached. Registering a service worker does not automatically make a site offline-capable — you decide what to cache (app shell, API responses, images) and what strategy to use (cache-first, network-first, stale-while-revalidate).

What is a PWA?

A PWA (Progressive Web App) is a regular website that meets three technical criteria — HTTPS, a Web App Manifest and a service worker — so browsers let visitors install it on their home screen. Once installed, it launches like a native app, works offline and can send push notifications.

Can a PWA access the camera?

Yes. A PWA can access the camera, microphone, geolocation and file system through the same Web APIs a regular website uses (getUserMedia, showOpenFilePicker, Geolocation). Every capability requires explicit user permission and works cross-platform, though a few APIs (Bluetooth, USB, NFC) are still Chromium-only.

Does a PWA help or hurt SEO?

A PWA does not directly change your Google ranking. Googlebot indexes your HTML the same whether or not you have a service worker. The indirect effect is Core Web Vitals: repeat visits from installed users have near-zero TTFB and better INP, which improves your CWV score and, over time, ranking.

Do PWAs work on iPhone?

Yes. Since iOS 16.4 (March 2023), iPhone and iPad support the full PWA feature set: install to home screen from Safari, standalone launch, offline via service worker, and Web Push notifications. The install step is manual — Safari does not show a browser prompt; users must tap Share → Add to Home Screen.