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Live Browser Storage Quota, Cache API & IndexedDB Inspector (2026)

Query real-time navigator.storage.estimate() quotas, enumerate IndexedDB databases, inspect LocalStorage/SessionStorage byte footprints, and simulate PWA offline cache eviction policies.

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Live Browser Storage Quota, Cache API & IndexedDB Inspector — Interactive Console
Runs locally in your browser • Instant output
Live Origin Storage & Cache Telemetry
Live origin telemetry loaded.
Origin Quota
N/A
Used: 0.00 MB
localStorage (5 MB Cap)
0.00 KB (0.0%)
0 keys
sessionStorage
0.00 KB
UTF-16 DOMString
document.cookie Jar
0 Bytes
4,096 B Header Limit
Origin localStorage Key Breakdown
No keys currently stored in window.localStorage. Click + Inject 192 KB Test Bloat above to test live UTF-16 byte accounting.
Ready
Embed / Cite This Tool (Markdown & HTML)
GitHub / Reddit Markdown Badge[![Live Browser Storage Quota, Cache API & IndexedDB Inspector](https://img.shields.io/badge/ZerosUniverse-Free_Tool-ff6a00)](https://www.zerosuniverse.com/tools/browser-storage-cache-bloat-inspector/)
Blog / Documentation HTML Citation<a href="https://www.zerosuniverse.com/tools/browser-storage-cache-bloat-inspector/">Live Browser Storage Quota, Cache API & IndexedDB Inspector — ZerosUniverse</a>

2026 Quick-Reference Cheat Sheet & Benchmark Table: Live Browser Storage Quota, Cache API & IndexedDB Inspector

Quick Answer & 2026 Technical Summary (browser storage quota cache inspector)Updated 2026 Standard

Modern websites use Service Workers, the Cache API, and IndexedDB to store offline assets, video segments, WebAssembly bundles, and telemetry queues. Because Chromium allows a single origin to use up to 60% of total disk space, visiting media-heavy sites can silently accumulate several gigabytes of cached blobs. Use this interactive browser storage quota cache inspector above to test navigator storage estimate online test, indexeddb localstorage byte size analyzer, and pwa cache api bloat calculator locally in your browser with zero server uploads.

Target Keyword Spec: browser storage quota cache inspector | Modules: Live Navigator Storage Manager & Quota Telemetry • LocalStorage & SessionStorage UTF-16 Byte Profiler • IndexedDB & Service Worker Cache API Enumerator
Primary Focus: browser storage quota cache inspector
Core Capability: navigator storage estimate online test
Privacy Mode: 100% Client-Side (Zero Upload)
Technical Parameter / ModuleStandard / Keyword SpecArchitecture & Validation RuleOperational Use Case (2026)
Live Navigator Storage Manager & Quota Telemetrynavigator storage estimate online testExecute navigator.storage.estimate() and persisted() checks in real time to...Diagnosing Mobile Browser 'Site Data' Storage Bloat
LocalStorage & SessionStorage UTF-16 Byte Profilerindexeddb localstorage byte size analyzerScan every key-value pair in LocalStorage and SessionStorage, computing exa...PWA Offline Storage & Quota Exceeded Debugging
IndexedDB & Service Worker Cache API Enumeratorpwa cache api bloat calculatorList active IndexedDB object stores and CacheStorage buckets, and model how...Privacy Auditing of Persistent Client-Side Trackers
Hardware & Protocol Spec Version2026 IEEE / JEDEC / VESA / PCI-SIGHigh-Precision Browser API TelemetryCross-checked against hardware datasheets
Real-Time Measurement LooprequestAnimationFrame / WebAudio / WebGLSub-Millisecond HighResTimeStamp (DOMHighRes)Runs natively on desktop, laptop & mobile browsers
Safety Headroom & Efficiency Factor80 PLUS / PFC 0.8–0.9 / 25% Surge MarginContinuous Load ≤ 75% Rated Peak CapacityPrevents thermal throttling & voltage droop
In-Depth ZerosUniverse Tutorial

9 Tricks to Free Up Space on Your Android Phone in 2026

Read our complete step-by-step editorial guide, architecture breakdown, and defensive best practices on ZerosUniverse.

Read Full Guide

How to Use Live Browser Storage Quota, Cache API & IndexedDB Inspector

01

Run Live Browser Storage Telemetry Scan

Click Refresh Live Telemetry to query navigator.storage.estimate(), IndexedDB databases, CacheStorage keys, and LocalStorage/SessionStorage entries in your browser.

02

Inspect Key-by-Key UTF-16 Memory Allocation

Examine the sorted storage breakdown table to see which keys consume the highest percentage of the 5 MB LocalStorage cap.

03

Simulate Origin Quota & Mobile Disk Pressure

Use the Chromium/Safari/Firefox Quota Simulator sliders to calculate maximum per-origin storage limits and LRU eviction trigger points for any device disk size.

04

Purge Test Caches or Export Storage Audit JSON

Safely clear sandbox test keys, test persistent storage permissions, or export a complete JSON snapshot of your browser's storage configuration.

Key Capabilities & Technical Architecture

Live Navigator Storage Manager & Quota Telemetry

Execute navigator.storage.estimate() and persisted() checks in real time to reveal exact origin quota allocation, active byte usage, and available disk headroom.

LocalStorage & SessionStorage UTF-16 Byte Profiler

Scan every key-value pair in LocalStorage and SessionStorage, computing exact UTF-16 byte consumption against the strict 5 MB (10,485,760 bytes) synchronous Web Storage ceiling.

IndexedDB & Service Worker Cache API Enumerator

List active IndexedDB object stores and CacheStorage buckets, and model how Progressive Web Apps (PWAs), offline media caches, and tracker scripts accumulate gigabytes of hidden storage.

Android & Desktop Browser Eviction Calculator

Simulate Chromium LRU (Least Recently Used) origin eviction thresholds when mobile flash storage drops below critical capacity, with 1-click local key sanitization.

Practical Use Cases

Diagnosing Mobile Browser 'Site Data' Storage Bloat

Understand why Chrome, Brave, or Safari on Android/iOS consumes 5 GB–20 GB of internal storage via unpruned Service Worker caches and IndexedDB blobs.

PWA Offline Storage & Quota Exceeded Debugging

Test QuotaExceededError boundaries across Chromium (up to 60% of disk), Firefox (up to 10 GB per group), and WebKit Safari before deploying offline-first web apps.

Privacy Auditing of Persistent Client-Side Trackers

Inspect persistent LocalStorage supercookies, analytics state objects, and cached identifiers stored inside your active browser context.

Frequently Asked Questions (FAQs)

Why does Chrome on Android use so much storage under 'Site Settings > Data Stored'?+

Modern websites use Service Workers, the Cache API, and IndexedDB to store offline assets, video segments, WebAssembly bundles, and telemetry queues. Because Chromium allows a single origin to use up to 60% of total disk space, visiting media-heavy sites can silently accumulate several gigabytes of cached blobs.

How much space does LocalStorage actually allow compared to IndexedDB?+

LocalStorage and SessionStorage are capped at approximately 5 million UTF-16 code units (10 MB of raw memory, or 5 MB of ASCII text) per origin and block the main UI thread. IndexedDB and the Cache API are asynchronous and share the dynamic origin quota (often tens of gigabytes).

What happens when a browser hits its global storage quota limit?+

When available disk space runs low ('storage pressure'), the browser's Quota Manager evicts the entire storage bucket of the Least Recently Used (LRU) non-persistent origin all at once to prevent partial data corruption.

What does navigator.storage.persist() do?+

Calling navigator.storage.persist() requests that the browser mark the origin's storage box as 'persistent', exempting its IndexedDB and Cache API data from automatic LRU background eviction under low-disk conditions.

Why is the reported storage quota slightly rounded in some browsers?+

To mitigate cross-origin disk-size fingerprinting and side-channel attacks in Incognito/Private modes, browsers intentionally quantize or cap the value returned by navigator.storage.estimate().