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Note
titleImage Size Limits and Requirements

Typically, images up to 13 inches wide are displayed without causing the horizontal scroll bar to appear when the browser is full-screen. Wider images make scrolling necessary and may cause the page, the wiki markup, or both, to be displayed improperly so that lines no longer wrap.
 
You can attach images at any size and change the display size in Confluence. Thus, you can use the original image capture which provides the best resolution with the least loss of data. Try specifying the width only, in even increments calculated based on 72 pixels per inch:
 
Image Width in Inches = 13, Width in Pixels = 936
Image Width in Inches = 12, Width in Pixels = 864
Image Width in Inches = 11, Width in Pixels = 792
Image Width in Inches = 10, Width in Pixels = 720
Image Width in Inches = 9, Width in Pixels = 648
Image Width in Inches = 8, Width in Pixels = 576
 
If you need to re-size your image, you can so so in PowerPoint by following the steps in this tip. You can also use a tool such as PaintShopPro or PhotoShop and re-size the image as a percentage of the original size.  

Tip
titleTip

If you set the width in Confluence and the image is not rendered properly in IE 7 or another browser, you will need to re-size the image using a tool. You can set the size , it's necessary to resize in a tool, either to the exact dimensions or to a percentage of the original or to the exact width you want to displaysize. If the image was imported from Microsoft Word, removing the exact dimensions from the wiki markup often solves the problem. If the image then becomes too large, resize it to a percentage of the original size.

To insert an image on a page:

...