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Save-Data

RequestActive

Save-Data is a Client Hints header indicating the user has enabled a data-saving mode (e.g., Chrome's Lite mode, Opera Turbo). Servers use this to serve reduced-quality images, skip non-essential assets, and minimize response payloads. The value is always '1' when present – its absence means data saving is not requested.

Save-Data: on

Description

Save-Data signals that the user prefers reduced data usage. Servers should respond by: serving lower-resolution images, disabling autoplay video, omitting optional fonts, reducing animation quality, and skipping analytics payloads. The Vary: Save-Data header should be included in responses that change based on this hint to ensure correct caching. Available in Chrome since version 49.

Examples

Client sends
http
GET /page HTTP/1.1
Save-Data: on
Server varies on it
http
HTTP/1.1 200 OK
Vary: Save-Data
Content-Type: text/html

Related

Accept-CHVary

Specification

W3C Client Hints – Save-Data specification →