Device-Memory Header

Table of Content

The Device-Memory client hint header is an important piece of information that a browser may incorporate into HTTP requests. Its main function is to communicate the device’s memory capacity to the server. This aids servers in customizing the content based on the user's device constraints, thus providing an appropriate and smooth user experience.


Device-Memory: <number>

This syntax is used for generating a Device-Memory header, where <number> denotes the approximate amount of device RAM in gigabytes.


Just a single directive is associated with the Device-Memory header which is the <number>. This represents the amount of memory in gigabytes of the client device rounded to the nearest power of 2.


Device-Memory: 0.5

This means that the device memory is approximately 0.5 GB or 512 MB.

Device-Memory: 1

This signifies that the device memory is approximately 1 GB.

Browser Compatibility

Browser Compatibility
Chrome Supported
Firefox Not Supported
Safari Not Supported
Opera Supported
Edge Supported

How to modify Device-Memory header

ModHeader is a browser extension that allows users to modify the HTTP request headers sent to the server. This can come in handy for testing or developing purposes.

For example, to modify the Device-Memory header using ModHeader, first install the extension and activate it. Click on the ModHeader icon and under 'Request headers', add a new row by clicking on the plus (+) button. Enter 'Device-Memory' in the 'Header name' field and the desired number of GBs in the 'Header value' field.

This is especially useful when you're developing a responsive web application where content-load depends on the user's device memory. Using ModHeader, you can simulate different device memory scenarios and ensure that your web application functions accordingly.