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Optimizing Image Size for Email

Many email designers start out with questions about image size: What size should email images be? Is landscape or portrait better for emails? How can I ensure my email’s use of images doesn’t land me in the spam folder? These questions are great to consider when creating a new email template

What Size Should Email Images Be?

In email design, images should ideally be as small as possible without sacrificing image quality. This is because large images can lead to slower load times, which may also negatively impact engagement rates. 

For emails with multiple images, aim to keep each image at or below 250 kb. Emails with one large image (such as a header image) and some text may include an image up to 450 kb in size. Any image over 1MB urgently needs to be reduced in size.

Image Dimensions vs. File Size

While image files should be kept at or below 250 kb in size, the ideal image dimensions may vary depending on an email’s design. 600px has commonly been regarded as the ideal width for email banners. However, newer devices can process larger image dimensions. This is why the Mailchimp template builder caps image width at 1200px.

Even though 600px is no longer a strict rule, keeping images under 900px in either direction is still ideal to ensure fast load times. If your organization includes a signature or logo in every email, aim to keep this image below 250px in either direction.

Deliverability & Images in Email

Deliverability has a critical influence on any email’s success. To maximize deliverability and engagement, design your emails with only relevant images which add value to your content.

It’s important to remember that some email clients may block images by default, which can impact the overall user experience. An email that includes only images is also likely to land in the spam folder. In addition, sending images which are too large can have a negative impact on deliverability.

At Pure Firefly, our template design services consider deliverability by following best practices to ensure that your emails reach the inbox and are likely to encourage engagement. Our experienced team is here to help individuals and organizations of any size create visually appealing and effective email templates. Contact us to learn more.

What Makes an Effective Email Image?

Ultimately, the right images for your emails will vary depending on your industry. However, some key trends and tips apply no matter your audience:

  • Build on your brand: Whether you use photos, icons, or illustrations, ensure that any email image is consistent with your overall brand.
  • Guide the eye: Images immediately attract attention, so place them near the most important parts of an email.
  • Always add alt text: Some subscribers can’t view images in emails. They may have images deactivated in their inbox, while others use screen readers. Add alt text to every image to maintain accessibility for all subscribers.
  • Don’t forget to smile: Images with faces can convey emotion and cultivate feelings of connection with your brand. Don’t be afraid to include a headshot in your email signature or add a candid image to your latest weekly update

Pure Firefly is Here to Help!

If you need a helping hand with your email images, don’t hesitate to contact an email expert. Pure Firefly’s team is experienced with template design across various industries, and specializes in Mailchimp’s new template builder. Schedule a one-on-one training for quick questions, or contact us for a free quote on email design.

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