> ## Documentation Index
> Fetch the complete documentation index at: https://help.dingtalk.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Image Upload Specifications

> This page describes the image size specifications for PC and mobile, including recommended pixel dimensions and file size limits. It also notes that the effective content of a background image must be center-aligned and stay consistent across different page widths (standard, medium, and extra wide).

## Image Size Specifications

<Note>
  Configure images separately for each platform. If you upload only a PC image, the mobile image is cropped automatically from it.
</Note>

PC size specifications:

* To prevent blurry images, export at 3x resolution (5760px\*720px) and keep the file smaller than 3 MB
* Center-align the "effective content" of the background image (for example, the copy) within the header image, and keep it consistent with the page width you set (standard, medium, or extra wide)
* Alias: page width, standard = 1180px; medium = 1440px; extra wide = 1920px

Mobile size specifications:

* To prevent blurry images, export at 3x resolution (1125px\*480px) and keep the file smaller than 3 MB