Files

Things to know before you start:

You may upload up to 200 MB of files to your SmartSender.io Library. Files can be uploaded from your computer or added by file URL.

But before you upload your images, make sure they’re optimized for the best results and to reduce the likelihood of an upload error.

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

Sizing can also vary depending on the type of content block you’re working with.

If you add Image Group blocks to a multi-column section, make sure smaller images are clear enough for your recipients to see.

Image files should be formatted as JPG, GIF, or PNG to ensure they’ll display correctly across various email programs. PDF, PSD, and AI files cannot be used because those file types are not consistently supported across web browsers. You can use the PNG format if you need to retain transparency.

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.

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.

See the Image size requirements

	Height	Width
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	Auto*	600 pixels or less
Two-column Template	Auto*	250 pixels or less
Three-column Template	Auto*	150 pixels or less
Event Landing Page	150 pixels is recommended	800 pixels is recommended
Event Registration Page	150 pixels is recommended	800 pixels is recommended

NOTE The height is unlimited and depends on the length of the content, but let’s think about recipients. The longer the email, the less likely it is that they will read it to the end, go to the site and buy something. Place the main idea and the CTA button at the beginning.

The weight and amount of content also matter a lot. For example, Gmail will truncate message content that is too long and heavy. And at the end of the letter, there is an “Unsubscribe” link, which the user will not see because of this and can complain about spam.

Type	Works Best With	Pros	Cons
PNG	All 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
JPG	Photos	Small file size	Distorts image to reduce the file size Doesn’t work well with text Doesn’t support transparency Compresses when uploaded
GIF	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

To add your files to the Library, follow the steps below:

Step-by-step instructions:

Navigate to the “Files” page in the “Content” section (Menu -> Content -> Files).
Click the “Upload File” button or
Click the “Add File URL” button.

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