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Embedded images vs linked images in email signatures

  1. Exclaimer Knowledge Base
  2. Signature Design
  3. Useful Information
Ari Flavell
  • Updated

There are two options available when adding images to a signature design - you can either add an image/logo by embedding it directly into the signature or by hosting it externally and linking to it.

NOTE: Exclaimer supports a maximum image size of 150KB. For more information on adjusting image size, see our guide on image sizing.

Most email clients support images in email signatures. However, each image type comes with its own pros and cons.

This article discusses the differences between and the pros and cons of embedded images and linked images.

embedded images

embedded images are images that are hosted directly within the signature by uploading them from a local directory. These are contained within the email, which affects the email's file size. For more information, see our resources on working with background images, or our Image/Logo, Banner, or Rotating Banner elements.

embedded images are stored similarly to the following example:

<img src="cid:myimagecid" />

Pros

  • Are automatically displayed by the mail client with no extra clicks required.
  • Can be added from any local directory

Cons

  • Can be removed by the mail client, device, or internal system
  • Increases the file size of the email
  • Image quality can degrade over multiple responses

linked images

linked images are hosted on a publicly facing web server, such as your company's web directory. The signature displays the image via the linked file, but images are not added to the email as a physical element. For more information, see how to add a linked image or use our Image/Logo, Banner, or Rotating Banner elements.

linked images are stored similarly to the following example:

<img src="http://www.mywebsite.com/SigImgs/mylogo.png" />

Pros

  • Less likely to be removed by the mail client, device, or internal system
  • Consistent image quality
  • Does not affect the file size of the email

Cons

  • Requires an internet connection to view the images
  • Some mail clients require you to Click here to download pictures before viewing images
  • Requires a public-facing web storage, such as your company's web directory, or an alternative image hosting site such as OneDrive or Google Drive

Which option is suitable for you?

Consider how your customers view the emails you send them:

  • If many of your customers use email clients like Outlook, then embedded images may be the most suitable.
  • If many of your customers view your emails on mobile devices, then linked images may be the most suitable.