WordPress & Mailchimp: Information on image sizes


What are default WordPress image sizes

By default, WordPress offers predetermined image sizes, that are used in such features as featured image. WordPress default image sizes are:

  • Thumbnail size (150px square);
  • Medium size (maximum 300px width and height);
  • Large size (maximum 1024px width and height);
  • Full size (full/original image size you uploaded).

How to change default image sizes

It is possible to change the settings for default image sizes through your WordPress admin dashboard. To adjust the sizes, you have to:


  • Navigate to your WordPress Admin Dashboard;
  • Go to Settings;
  • Choose media settings;
  • Change to desirable size values.



Mailchimp: General Tips for Images

Here are some general tips for your images.


  • Format
    When you save images, use PNG, JPG, or GIF format. You can use PNG format if you need to retain transparency.
  • Color Mode or Profile
    Colors used online are different from those used in print, so it’s important to make sure the colors in your images are set correctly. Web images should be saved with the RGB color profile or mode. CMYK, which is what designers use for print, doesn’t render accurately online and can sometimes break your embedded image.
  • Alt Text
    It’s a good idea to add alt text to your images. Alt text is essential for accessibility and for viewers who might have trouble downloading your images. It can also help with search engine optimization for your landing pages.
  • High-Definition Screens
    Many smartphones, tablets, and laptops feature high-definition screens, such as retina displays, that offer a higher ratio of pixels per inch. This means that some images may appear fuzzy on these displays. To make sure your images appear clearly on all screens, you can use a higher resolution photo in an Image content block, and constrain the dimensions.
  • File Size
    It’s best to avoid overly large images, both in file size and pixel dimensions. We recommend a maximum file size of 1MB for images. 72 DPI is generally sufficient for the web, but isn’t required. We don’t recommend uploading images that are significantly larger than your content area or template.
  • Image Size
    Emails and landing pages have a limited amount of width for images. For specific width recommendations, check out the following sections based on the type of content you’re creating.



Image Sizes for Emails

Mailchimp’s email templates are 600 pixels wide, so it’s best to size your images with that maximum width in mind.

Image size recommendations vary based on the number of columns in your email template.


Recommended tools to resize your image online.



  1. Picresize.com
  • Drag & drop your image file, then click to edit picture,

  • Edit the picture size to recommended Worpress & Mailchimp sizes.


  • Select Image file format & quality.


  • And, SAVE your file to your computer.


  1. Resizeimage.net
  • Upload your image file


  • Resize your image to recommended WordPress/Mailchimp sizes and SELECT image format.


  • Press the “RESIZE IMAGE” .


  • View Image and Download your Image file.