Learn the ideal size for email templates including width, height, file size, and image dimensions to ensure perfect display across all devices and email clients.
Last Updated: May 12, 2025
Email marketing continues to be one of the most effective tools for engaging audiences, driving conversions, and building brand loyalty. But even the best-written email can fail if it's not formatted properly. One of the most critical yet often overlooked aspects of email marketing is the size of the email template.
In this guide, weâll walk you through the ideal email template sizesâincluding width, height, file size, and image dimensionsâto ensure your messages are displayed correctly across all devices and email clients. Whether you're designing promotional emails, newsletters, or transactional messages, optimizing the size of your email templates is essential for performance and engagement.
An email template thatâs too wide might not render properly on mobile devices. A template thatâs too tall could be clipped by Gmail. Oversized image files can cause slow loading times or get flagged as spam. Therefore, understanding the ideal size helps you:
The industry standard width for email templates is 600 pixels. This width is widely supported across most email clients and ensures your content looks good on both desktop and mobile devices.
To make your email mobile-friendly, use a fluid or hybrid layout that adjusts content based on the screen size. For instance, you can set the width to 100% for mobile and max-width to 600px for desktop.
Unlike width, there is no fixed standard for height. However, keeping your email height under 1500 to 2000 pixels is advisable. Longer emails may be clipped by email clients like Gmail, which hides content behind a â[Message clipped]â link when an email exceeds 102KB in size (including code).
The total email sizeâincluding text, HTML code, and embedded imagesâshould be under 100 KB to avoid getting clipped in Gmail.
Images play a crucial role in email design. However, incorrect image sizing can lead to layout issues or poor loading times. Hereâs what to keep in mind:
| Element | Recommended Size |
|---|---|
| Full-width banner | 600 x 200â300 pixels |
| Product images | 300 x 300 pixels |
| Logos | Max height: 100 pixels |
| Thumbnails/icons | 50 x 50 pixels or smaller |
While not often considered part of "size," typography impacts readability significantly.
Set line-height to at least 1.4â1.6 for better readability on small screens.
Your call-to-action (CTA) buttons should be easy to tap, especially on mobile devices.
Use contrasting colors and ensure enough white space around buttons to prevent misclicks.
More than half of all emails are opened on mobile devices. If your email doesnât look right on a smartphone, you risk losing your audience.
Before sending, always test your email across different email clients and devices using tools like:
These tools help catch layout issues, broken links, and rendering inconsistencies before your audience sees them.
An accessible email ensures that everyone, including users with disabilities, can engage with your content.
Email design isn't just about aestheticsâit's about ensuring your message is delivered and displayed exactly how you intend it to be. By following the recommended sizes for your email templates, you can improve engagement, avoid technical issues, and create a better experience for your subscribers.
Whether youâre a marketer, designer, or developer, keeping these size guidelines in mind will help you build emails that perform well across all platforms.
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