Save-DataLimited availability
Browsers send the Save-Data HTTP request header when the user turns on a data-saving mode. It is a hint to reduce data sent to the browser. Servers should respond with alternative content, such as smaller images and videos, or different markup and styling.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–64Not supported
65+Supportedsince Mar 6, 2018
Current: 155Edge
12–18Not supported
79+Supportedsince Jan 15, 2020
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–64Not supported
65+Supportedsince Mar 6, 2018
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Firefox, Safari, Firefox Android, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: saveData.
Feature detection
JS · check before using
if ("NetworkInformation" in globalThis && "saveData" in NetworkInformation.prototype) {
// NetworkInformation.saveData is available
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (2). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| NetworkInformation.saveData | 65 | 79 | ✕ | ✕ | 65 | ✕ | ✕ |
| http.headers.Save-Data | 49 | 79 | ✕ | ✕ | 49 | ✕ | ✕ |