Prepare images for upload

Optimize image quality to help avoid errors when uploading to your Library

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Prepare images for upload

Get your image ready to upload to your Library by making sure it has the right height and width, resolution, file size, and file type. This protects the image's quality and prevents errors during the upload process. 

To determine the right settings for your image - or why your image isn't displaying properly - check out the information and general recommendations for each of these factors in greater detail below. 

Note: There are specific content standards when using Facebook Ads or the Social Campaign app tab on Facebook.

Image Size

"Image size" refers to the dimensions of your image - the image height and width. Constant Contact will compress any image that is over 800 pixels wide. This will cause the image to lose quality - leading to grainy, fuzzy, and blurry images.

Most Constant Contact templates are about 600 pixels wide, so we recommend keeping the width of your images to no more than 600-650 pixels. 

Keep in mind that the 600 pixel recommendation is for an image that spans the width of the email. Check out the table below for recommendations on sizing images for a multi-column layout.

What is the recommended image size for my image?
Header Image
  • Less than 200 pixels will fully display in email preview panes
  • 600 pixels
  • Smaller widths will stretch your image to fit the header and larger widths will stretch your email header and distort your email
One-column Template*See note below
  • 600 pixels or less
Two-column Template*See note below
  • 250 pixels or less
Three-column Template*See note below
  • 150 pixels or less
*There usually isn't an ideal height because each block will adjust to fit the image's height. However, keep in mind that very large images may cause scrolling and some clients, like Outlook, may crop images that are more than 1728 pixels in height. 

Not sure what dimension or file size your image has? Find out here


"Resolution" refers to the number of pixels in an image. When you create an image, certain image editing programs allow you to set the resolution.

What is the recommended resolution for my image?
Whenever possible, we recommend that you save the original design file with a resolution of 72PPI. This will minimize image compression when you bring the image into the Constant Contact Library. 

File Size

While "Image Size" is the height and width of the image, "File Size" is the amount of storage space your image will occupy. Factors like image size and compression will contribute to the file size of your image.

What is the recommended file size for my image?
Constant Contact won't allow you to upload a file larger than 5MB. If your file is too large, here are some steps you can take to reduce its size:
  • If your image editor has an option to "Save for Web & Devices" or to "Optimize" the image, choose a resolution that shrinks the image's file size to less than 5MB.
  • Remember to flatten any layers when you save the final image. This will help to reduce the file size. 
Keep in mind that larger images may also take longer to load in a subscriber's inbox. If you are running into problems, try keeping your images under 1MB each.

File Type

"File Type" is a name given to a specific kind of file. Some types of images look better when saved as a specific type of file. The chart below shows you which file types work best with certain types of images.

What is the recommended file type for my image?
TypeWorks Best WithProsCons
PNGAll images
  • Best quality, regardless of content
  • Supports full transparency
  • Great for text
  • Can fix some distortions caused by other file types
  • Doesn't compress when uploaded

  • Larger file size
  • Photos
  • Small File Size
  • Distorts image to reduce file size
  • Doesn't work well with text
  • Doesn't support transparency
  • Compresses when uploaded
  • Logos
  • Simple Graphics
  • Low Resolution Images
  • Small file size
  • Supports basic transparency
  • Doesn't compress when uploaded
  • Limited to 256 colors
  • Images can appear grainy if they use web-unsafe colors

Tip: If an image won't upload as a JPG file, try saving it as a PNG or GIF file.

The Constant Contact Library doesn't allow image files in TIFF or BMP format, but you can use any basic image editing program to save them as a PNG, GIF, or JPG.

 Any links we provide from non-Constant Contact sites or information about non-Constant Contact products or services are provided as a courtesy and should not be construed as an endorsement by Constant Contact.

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