Browser Storage Quota & Persistence Inspector
Measure your origin's client-side disk quota, inspect IndexedDB and CacheStorage usage via navigator.storage.estimate(), and request persistent storage to protect local databases from automated eviction.
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Frequently Asked Questions
How does the browser determine my storage quota?
Browsers dynamically allocate origin storage pools based on available local disk capacity, typically granting between 20% to 60% of free storage pool space to standard origins.
What is the difference between "best-effort" and "persistent" storage?
Under "best-effort" mode, the browser may evict cached files and IndexedDB records when the user's hard drive runs low on space. When "persistent" storage is granted via navigator.storage.persist(), data cannot be evicted automatically without explicit user intervention.
Are any storage metrics sent to external servers?
No. All storage estimates, IndexedDB inspections, and quota calculations execute locally using native browser Web APIs.