How to add a countdown to an email

Overview

Countdown timers in time-sensitive emails (special offers, sales, event announcements, or holidays) can help encourage your contacts to respond to your call to action!

Read on to learn about countdown timers and how to generate and use a countdown image.

Why should I add a countdown timer to emails?

Countdown timers are one of the most effective tools in retention marketing with a high ROI, primarily because they create urgency which drives action.

By showing a ticking clock, you're visually signaling that time is limited, which compels contacts to make decisions faster.

Here's why countdown timers can work well with thoughtful offers:

• Triggers FOMO: Fear of missing out (FOMO) is a powerful psychological driver. Timers make the risk of missing out feel real and immediate.

• Increases conversion rates: Urgency often leads to quicker decision-making. Studies show that limited-time offers can improve click-through and purchase rates significantly.

• Clarifies deadlines: Customers may overlook or misread written expiration dates. A timer makes the deadline crystal clear.

• Improves email performance in automations: Adding dynamic timers to flows like abandoned cart, re-engagement, or flash sale sequences can dramatically boost their effectiveness—especially when personalized by behavior or time zone.

• Pairs well with scarcity tactics: When paired with messages like “Only 3 left” or “Offer ends at midnight,” timers reinforce the scarcity, making your message more persuasive.

How do countdown timers work?

When you add a countdown timer to your email using a tool like CountdownMail, it generates a dynamic image that:

• Calculates the time remaining between the moment the email is opened and the specified deadline

• Renders a GIF image that visually “ticks down” from that value

• Reloads or resets each time the email is opened

Unlike web-based timers that rely on JavaScript and live browser sessions, email clients (like Gmail, Apple Mail, Outlook, etc.) don’t support dynamic code execution or real-time countdown functions. Instead, they display images and load them only when the email is opened.

This means the countdown is calculated at the moment the recipient opens the email, not when it was sent, and the timer’s value is fixed at open time and visually decreases from there.

Your countdown should always reflect a fixed endpoint (for example, “Sale ends at midnight PST”) rather than a relative endpoint “you have X minutes from now."

How to create and use a countdown timer

Step One: Create a countdown timer

Use the tool of your choice to create a countdown timer image. We suggest CountdownMail.

Read CountdownMail's guide to creating your timer to learn about the many options available!

Step Two: Add an HTML block to an email

Countdown timers are GIF files, but you won't be able to use an image block to display them because they are dynamic, meaning you can't download the image and insert it in an email.

Instead, we'll use an HTML block that allows for more customized styling in addition to updating the countdown when contacts open their email.

Open your campaign or automation email, scroll to the elements section, and drag an HTML block wherever you'd like your countdown timer to appear.

Step Three: Insert countdown timer

Head back to CountdownMailer to grab your countdown timer's embed code.

Turn on the Enable HTTPS option, then click Copy and paste your countdown timer's embed code in your HTML block!

Troubleshooting