How to Add Custom Fields to Product Pages in Shopify (Without Slowing Your Store)

 

How to Add Custom Fields to Product Pages in Shopify (Without Slowing Your Store)

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Introduction

Ever wanted to show extra details like “Material,” “Care Instructions,” “Warranty Info,” or even custom dropdowns on your product pages? That’s where custom fields (aka metafields) come in.

In this guide, you’ll learn how to add custom fields to product pages in Shopify without installing any heavy app—keeping your store fast and SEO-friendly.

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What Are Custom Fields in Shopify?

Custom fields (technically called Metafields in Shopify) allow you to store and display additional product-specific data that isn’t part of Shopify’s default product fields.

✅ Examples:

• Ingredients list for food items

• Size charts or fit notes for clothing

• Technical specs for electronics

• Video links or PDFs

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Why Avoid Apps for Custom Fields?

While there are apps like Metafields Guru or Accentuate, they can:

• Slow down your site

• Add bloated code

• Cost extra monthly fees

Using Shopify's native metafields and your theme's liquid files, you can do it yourself—lightweight and free.

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Step-by-Step: How to Add Custom Fields to Shopify Product Pages

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Step 1: Define Your Metafield in Shopify Admin

1. Go to Settings > Custom data > Products.

2. Click “Add definition”.

3. Name your metafield (e.g., "Fabric Type").

4. Choose the content type (e.g., Single line text, URL, Rich text, etc.).

5. Save.

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Step 2: Add Custom Data to a Product

1. Go to Products > Choose a product.

2. Scroll to the Metafields section at the bottom.

3. Enter your custom value (e.g., "100% Organic Cotton").

4. Save.

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Step 3: Display Metafields on Product Page (Edit Theme Code)

1. Go to Online Store > Themes > Edit Code.

2. Open the product template file:

   • For Online Store 2.0 themes: main-product.liquid or main-product.liquid section inside sections/.

3. Paste this code where you want the custom field to appear:

   {{ product.metafields.custom.fabric_type }}
   

🔄 Replace custom with your namespace and fabric_type with your key.

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Step 4: Add Label and Styling (Optional)

To make it look neat, wrap the field in a paragraph with a label:

<p><strong>Fabric:</strong> {{ product.metafields.custom.fabric_type }}</p>

You can also add custom CSS to style it nicely.

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Bonus: Add Conditional Display

To avoid showing blank fields, use an if condition:

{% if product.metafields.custom.fabric_type %}
  <p><strong>Fabric:</strong> {{ product.metafields.custom.fabric_type }}</p>
{% endif %}

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Best Practices to Keep Your Store Fast

• ✅ Use native Shopify metafields, not apps, for static data

• ⚡ Avoid using JavaScript to render data—keep it Liquid-based

• 💾 Limit metafield types to what's necessary (text, URL, file)

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Common Use Cases for Custom Fields

Use Case	Metafield Type
Fabric or Material Info	Single line text
PDF Spec Sheet	File
Size Chart URL	URL
Washing Instructions	Rich text
Warranty Period	Number / Text

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Conclusion

Custom fields make your product pages more informative and tailored without bloating your store. By using Shopify's built-in metafields, you get full control over what content shows—while keeping your store fast, clean, and optimized.

No apps. No delays. Just pure Shopify.

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SEO Meta Description

Learn how to add custom fields to Shopify product pages using native metafields. No apps needed—lightweight, fast, and fully customizable.