What font and image format are accepted in Rule?

A good thing to remember is that not all email clients support all types of fonts. When working in the Rule app in the campaign editor, a fallback/web-safe font is always displayed and to see the external font (the optional font).


  1. It is possible to add an optional font to your templates.
  2. However, it is important to know that there is limited support for fonts that are not web-safe. Only "regular" web fonts such as Times New Roman, Arial, and Verdana are fully supported in text. Read more about what is considered web-safe fonts here.
  3. It is possible to use external fonts such as Google Fonts but the support is not 100%, so in some clients like Gmail and Outlook, a fallback font that is web-safe will be displayed. Therefore, we need both the external font you want to use in the template and specify which fallback font you want to be displayed in case of non-support.

Image format and size

The image formats that can be used in Rule are: JPG, PNG, GIF.

  1. The maximum height for images is 2000 px. Above this, the image will be cropped.
  2. To make the image responsive/high-resolution on a retina screen, it needs to be saved in a double file format. For example, if you want an image to be 200 px wide in the newsletter, you should save (or crop) it to 400 px wide.
  3. The image cannot weigh more than 2 Mb. Preferably less! Compress the image, you can use animately.co to reduce the size of animated GIFs.
  4. It is worth mentioning that by double-clicking on the image block, you will go to Image Properties where you can add a URL to an animated image file that is larger than 2 Mb. Since the email "streams" the image from an external URL instead of it being directly in the email, there is no size limit.

Moving images

  1. We support moving images in mailings and we support image formats such as: *.gif, *.png, *.jpg

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