Email marketing remains one of the most effective ways to reach customers and readers. But with more than half of all emails now opened on mobile devices, it’s no longer enough for your newsletters to look good on a large screen. They need to work seamlessly on both mobile and desktop – fast, clear, and with a focused message. Here’s a guide to designing and writing emails that perform across devices.

Know your audience – and their screen

Before you start designing, it’s essential to understand how your audience reads emails. Many people check their inbox on the go – on the train, during a coffee break, or while waiting in a queue. That means you only have a few seconds to grab their attention.

• Think mobile first. Start by designing for the smallest screen. If it works there, it will work anywhere.
• Keep text short. Long paragraphs can feel overwhelming on mobile. Use short sentences and clear spacing.
• Use clear headings. They help readers scan quickly and find what matters most.

Design that adapts automatically

A responsive design is key to emails that perform well on every device. It ensures that your layout automatically adjusts to the screen size.

• Single-column layout. On mobile, one column works best – it keeps text and images in the right order.
• Large, tappable buttons. Make sure buttons and links are easy to tap with a thumb.
• Readable text size. Use at least 14–16 px for body text and 20–24 px for headings.
• Smart image use. Choose images that scale automatically and avoid heavy files that slow down loading.

A good habit is to test your email on multiple devices before sending it. Most email platforms offer previews for both mobile and desktop.

Write subject lines that get opened

Even the best-designed email won’t make an impact if it isn’t opened. The subject line is your first – and often only – chance to spark curiosity.

• Keep it short. On mobile, only the first 30–40 characters are visible.
• Be specific. Tell readers what they’ll gain by opening the email.
• Avoid exaggeration. Overused words like “free” or “exclusive” can trigger spam filters.
• Use the preheader. The short line of text after the subject can expand on your message and boost open rates.

Content that converts

Once your email is opened, it’s all about keeping attention and guiding the reader towards action.

• Lead with the key message. The first lines should explain why the email matters.
• Use clear calls to action (CTAs). Buttons like “Read more”, “Sign up”, or “Shop now” should stand out and be easy to find.
• Create visual rhythm. Use white space between paragraphs, images, and buttons to make the email easy to read.
• Personalise where possible. Use the recipient’s name or past behaviour to make the message more relevant.

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Test, measure, and optimise

Even small tweaks can make a big difference to how your emails perform. That’s why testing and analysis are essential.

• A/B test subject lines. Try two versions and see which gets more opens.
• Track click rates. Which links get attention – and which are ignored?
• Monitor unsubscribes. A rising unsubscribe rate can signal that your content isn’t hitting the mark.
• Use data actively. Adjust send times, content, and design based on what the numbers tell you.

Create a consistent experience

An email rarely stands alone. It’s part of a wider customer journey, leading readers from their inbox to your website or online shop. That’s why consistency matters.

Make sure the colours, tone, and message in your email match what readers see when they click through. It builds trust and increases the likelihood that they’ll complete the desired action.

Emails that work – whatever the screen size

Creating emails that perform on both mobile and desktop isn’t just about design – it’s about understanding your audience. A great email is simple, relevant, and easy to act on, whether it’s read on a smartphone during the commute or on a large screen at the office.

With responsive design, clear messaging, and ongoing optimisation, you can ensure your emails don’t just get opened – they deliver real results.