Web/API/StorageEstimate/quota

Secure contextThis feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The StorageEstimate dictionary's quota property is a conservative approximation of how much storage is allotted to the origin or Web app that called StorageManager.estimate(); there may be more space available, but there will not be less. This value is an estimate to help prevent its use for fingerprinting—that is, identifying a device using an amalgamation of the values of seemingly innocuous properties.

Syntax

quota = StorageEstimate.quota;

Value

A numeric value specifying an approximation of the total amount of storage space available for use by the application.

Example

In this example, we obtain the usage estimates and present the percentage of storage capacity currently used to the user.

HTML content

<label>
  You’re currently using about <output id="percent">
  </output>% of your available storage.
</label>

JavaScript content

navigator.storage.estimate().then(function(estimate) {
  document.getElementById("percent").value =
      (estimate.usage / estimate.quota * 100).toFixed(2);
});

Result

Specifications

Specification	Status	Comment
StorageThe definition of 'quota' in that specification.	Living Standard	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`quota`	Chrome Full support 52	Edge Full support ≤79	Firefox Full support 51	IE No support No	Opera Full support 42	Safari ?	WebView Android Full support 52	Chrome Android Full support 52	Firefox Android Full support 51	Opera Android Full support 42	Safari iOS ?	Samsung Internet Android Full support 6.0

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown