Recommended image sizes

Learn the recommended image sizes for UserZoom Studies across all platforms and study types.

This article applies to: uz logo tiny.png UserZoom

Plan Availability: All Plans
👥 User roles: Owner, Admins, and Researchers
For more information, see our article on how to find your plan and user role.


On this page:



Images added to questions text and in Tabs

  • Images are shown in their original size unless otherwise specified.
  • For images too large to fit the screen properly, change the width of the image to 100% (without specifying a height) so that it auto-scales. To do so, follow these steps:
    1. Edit the question.
    2. Click HTML at the top of the editor.
    3. Find the image in the HTML code.
    4. Set it to style="width:100%". The code should look like this:
      <img alt="" src="/resources/media/xxxx/some_image.png" style="width:100%" />



Images added as Thumbnails

  • In both desktop and mobile studies, images scale down to best fit the screen.
  • Remember to take into account the proportions of each screen type to display images properly.



Images added in Click Tests and Timeout Tests

These question/task types are only available for Essentials, Professional, International, and Premium plans.



  • Images have to be resized outside of UserZoom and uploaded in the desired size.
  • As a general guideline, images with the dimensions of 1240x680px shouldn't require scrolling (vertical or horizontal) in a browser with a resolution of about 1280x800px (approximately a 13" laptop).



  • Images auto-scale to best fit the width of the screen.
  • There can be no horizontal scrolling.
  • To avoid vertical scrolling, the image shouldn't be too long.
  • Images with dimensions 680x950px are quite large for a mobile screen, but have roughly the right proportions and shouldn't require scrolling on most phones.



Known Issue: Results heatmap export pixelated for studies with long vertical images

  • Issue:
    • When exporting the results of a study that includes a long image that requires a lot of scrolling (For example, a heatmap of a full webpage in a Click Test), the Results export is very pixelated/blurred and hard to read.
    • This occurs in both Chrome and Firefox browsers. 
  • Estimated Time of Resolution (ETR): TBD
  • Workaround(s): When building your study, break up the image into multiple images that are used over multiple questions to avoid the need for scrolling. This may impact the data integrity of your study in cases where you're looking for data on how far a user is willing to scroll to find something. 


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