StorageManager.persist() browser support

navigator.storage.persist() asks the browser to protect the origin’s stored data (IndexedDB, Cache Storage, service worker caches) from automatic eviction under storage pressure. It resolves with true when persistence is granted; the browser may refuse based on its own heuristics, such as user engagement, and navigator.storage.persisted() reports the current state without requesting it.

The table covers the StorageManager interface as recorded in MDN browser-compat-data.

• Legend
• Yes
• Partial
• Flag
• No
• Unknown

Browser / Platform	Support	Versions	Confidence	Source	Notes
Chrome (Desktop)	Yes	55	high	source	—
Chrome (Android)	Yes	55	high	source	1
Edge (Desktop)	Yes	79	high	source	2
Firefox (Desktop)	Yes	57	high	source	—
Firefox (Android)	Yes	57	high	source	3
Safari (macOS)	Yes	15.2	high	source	—
Safari (iOS)	Yes	15.2	high	source	4
Samsung Internet	Yes	6.0	high	source	5
WebView (Android)	Yes	55	high	source	6

1. Derived by browser-compat-data mirroring from Chrome.
2. Derived by browser-compat-data mirroring from Chrome.
3. Derived by browser-compat-data mirroring from Firefox.
4. Derived by browser-compat-data mirroring from Safari.
5. Derived by browser-compat-data mirroring from Chrome Android.
6. Derived by browser-compat-data mirroring from Chrome Android.

Source data: /compatibility/persistent-storage.json · Global usage: 93 % (StatCounter 2026-05)

Source: spec · MDN · Last verified 2026-10-03 · Confidence: high (computed from sources)

See also

• Eviction and best-effort vs persistent storage
• Storage Standard: persist() method (storage.spec.whatwg.org)
• StorageManager: persist() method (developer.mozilla.org)