How to add a testimonials slider section to any Shopify theme

Introduction

Build credibility and connect with customers using the Flexi Testimonials Slider — a dynamic section designed to showcase customer testimonials in a clean, scrollable format. Testimonials help humanize your brand by highlighting real experiences, stories, and outcomes from customers who already trust your products.

In the video above, you’ll learn how to add a testimonials slider to any Shopify theme using Flexi’s intuitive block-based system. Discover how to structure testimonial content, control slider behavior, and create a mobile-friendly experience that builds trust without overwhelming the page.

Perfect for homepages, product pages, and landing pages, the Flexi Testimonials Slider integrates seamlessly with any Shopify theme. Whether you’re featuring short quotes or longer customer stories, this section helps turn social proof into confidence.

Setup Instructions

Install the App

Visit the Shopify App Store and install Flexi Slider Sections. Start your free trial to unlock access to all Flexi sections, including the Testimonials Slider.

Install Section

Open the Flexi app and navigate to the sections library. Search for "Testimonials Slider" and click "Add to Theme" to install it instantly.

Add to Your Store

Go to your Shopify admin → Online Store → Themes → Customize. Navigate to the page where you want to display testimonials, click "Add section", and select "Testimonials Slider" from the available sections.

Set Section Width

In the section settings, choose how the testimonials slider should be displayed:

• Full width: Create an immersive, edge-to-edge testimonial experience
• Fixed width: Set a custom maximum width (320px – 1440px)
• Theme width: Match your theme’s default content container

Add Content

Click "Add block" to add individual testimonials. Each block can include a customer name, testimonial text, role or location, and optional avatar or brand logo.

You can add as many testimonials as you like and reorder them easily using Shopify’s drag-and-drop editor to surface your strongest social proof first.

Customize & Style

Customize your testimonials slider using Flexi’s built-in settings:

• Control slides per view on desktop and mobile
• Enable or disable arrows, pagination, and auto-play
• Adjust spacing, alignment, and card layout
• Customize typography, colors, and background styles

Works Seamlessly with Dawn & Horizon

Flexi sections are built for Shopify’s modern theme architecture, which means the Testimonials Slider works seamlessly with Dawn, Horizon, and all Online Store 2.0 themes.

Dawn Compatibility

Dawn is Shopify’s reference theme, and the Flexi Testimonials Slider follows the same responsive spacing patterns and accessibility best practices used throughout Dawn.

This ensures testimonial content inherits your theme’s typography and color system by default, while still allowing full visual control through Flexi’s customization options.

Horizon & Modern Framework Support

Horizon represents Shopify’s next-generation theme framework. The Testimonials Slider integrates cleanly with Horizon-based themes without overriding global styles or introducing JavaScript conflicts.

Because each Flexi section is self-contained and theme-safe, you can confidently add testimonials sliders to modern and highly customized storefronts.

Theme-Safe by Design

Every Flexi section is scoped, isolated, and performance-optimized. This means you can:

• Add or remove testimonials sliders without editing theme code
• Preview testimonial changes safely before publishing
• Reuse the same testimonials slider across pages and themes
• Switch themes without rebuilding social proof layouts

Whether you're using Dawn, Horizon, or a fully custom Online Store 2.0 theme, Flexi’s Testimonials Slider adapts automatically — helping you showcase customer stories in a clear, engaging, and conversion-focused way.