Have you ever noticed that when your customers scroll through a product page, the “Add to Cart” (ATC) button may disappear from their sight? A sticky ATC button, also called “sticky ATC”, is always visible on the screen, no matter where the visitor is on the page. In this article, we'll explore why this type of button has become essential to increase your sales and how the Shopify FullStack theme simplifies integration and customization.

Why adopt a sticky ATC button for your Shopify store?

In 2025, the user experience is at the heart of e-commerce strategies. Buyers navigate product pages that are often long (photos, detailed descriptions, reviews, FAQs, etc.). When they reach the bottom of the page, going up to the “Add to Cart” button can create friction. The ATC sticky eliminates this disadvantage:

1. Easy conversion: At any time, the buyer can click to add the item to their basket without interrupting their reading or discovery journey.
2. Increased visibility: With the button always in front of your eyes, it remains the main point of action. Your visitors will no longer get lost in a long scroll.
3. Reduction in abandonment: Fewer clicks required, a shorter journey: all reasons to reduce page or cart abandonments.

In short, the ATC sticky encourages the customer to make a purchase more quickly.

The advantages of the sticky ATC button for your e-commerce

1. Improving the conversion rate Studies show that a constantly visible ATC button can increase the rate of addition to the cart by 10 to 20%. Users, who don't have to look for the CTA, are more likely to take action.
2. Better mobile ergonomics On a smartphone, the screen is smaller. Having a sticky ATC button, usually at the bottom of the screen, saves the visitor from going up the page, making the purchase more intuitive.
3. Boosting the impulse to buy During browsing, the Internet user can be seduced at any time by an image or a selling point. The ATC button, which is always accessible, encourages impulse buying.
4. Highlighting the CTA The fact that the button follows the customer focuses on the desired action: buy. It's becoming hard to ignore it, making your conversion strategy more effective.
5. Premium experience Online stores that offer a smooth and frictionless journey are perceived as professional and neat. Buyers have more confidence and are more likely to complete their purchase.

The different shapes of sticky ATC buttons

• Sticky bar at the bottom of the screen: Common on mobile, the button (often large and colorful) remains accessible at all times.
• Floating button on one side: Appears as an icon or a small fold-out box that says “Add to cart.”
• Top banner: Less common, some shops opt for a header containing the ATC button for a more discreet effect.

The choice depends on your graphic charter, the structure of your product sheets and the way in which you want to guide the buyer's eyes.

How the FullStack theme makes it easy to add the sticky ATC button

The Shopify theme FullStack natively integrates a “Sticky Add to Cart” feature that allows you to:

1. Activate in one click In your FullStack administration interface, a “Sticky ATC button” option is available. Simply check it to activate it, without having to change the code.
2. Customize the appearance Colors, shape, size, possible icon... The theme offers advanced settings to adapt the button to your visual identity. You can also define the text (e.g., “Buy now”, “Add to cart”, etc.).
3. Adapt behavior Choose where and when the button should appear (only on mobile, or also on computer), whether it should be deployed as a popup when clicked, or redirected to the basket, etc.
4. Maintaining smooth browsing FullStack loads this feature asynchronously, avoiding any slowdown. The experience remains smooth even on content-rich product pages.
5. Support and updates The FullStack team regularly proposes improvements to this feature and answers all your questions if you want to go further (integration of third-party applications, A/B tests, etc.).

On average, users of FullStack's Sticky ATC feature see a 12% increase in the rate of addition to the cart , in particular thanks to simplified ergonomics.

Some key figures on the impact of a sticky ATC button

• 80% of online shoppers feel that not being able to find the buy button easily is frustrating.
• A sticky button increases visibility by 50% compared to a static button at the bottom of the product sheet.
• 15 to 25% increase in the time spent on the page when the user does not have to scroll to find the “Add to cart” action.
• 2025 marks the year in which nearly three-quarters of mobile e-commerce sites adopt this feature to facilitate impulse buying.

Optimize your sticky ATC button for better performance

1. Choose a contrasting design The button should stand out from the bottom of the page. A bright color (in accordance with your charter) attracts the eye and encourages clicking.
2. Limit clutter Make sure that the sticky button doesn't take up too much space, especially on mobile. The user should see enough content around to make up their mind.
3. Using clear and compelling “Add to Cart” or “Buy Now” wording is the most effective. Avoid ambiguous formulas (e.g., “Let's go! ”) that don't clearly describe the action.
4. Offer instant visual feedback A slight animation or color change after the click reassures the user that their action is taken into account.
5. Measure the impact Set up a follow-up (Google Analytics, Shopify tools) to assess the effect of the sticky button on your conversion rate. This allows you to adjust the style or position accordingly.

Conclusion

The Sticky ATC button is much more than just a touch of design: it is a Major lever to optimize your conversion rate. By remaining visible at all times, it simplifies the buying journey, promotes momentum and reduces abandonment.

With the FullStack Shopify theme, you get integration ready to use and comprehensive customization options, all without slowing down browsing. In an ultra-competitive e-commerce context, every ergonomic detail counts in convincing the buyer to take action. So why not seize every opportunity by adopting Sticky ATC and watch your conversions increase? Your customers (and your turnover) will thank you for it!