How to Add a Birthday Field to the Shopify Customer Account Using Custlo

If you run an eCommerce brand on Shopify, you already understand the value of customer data.

But there’s one detail merchants consistently overlook — the birthday field.

It may seem small, but birthdays unlock powerful use cases like birthday offers, automated campaigns, milestone rewards, VIP upgrades, and emotional brand connections.

Unfortunately, Shopify does not provide a built-in way to add a birthday field to the customer account or registration form without touching Liquid or handling metafields manually.

This is exactly where most merchants get stuck.

Shopify’s default customer account has three major limitations:

• No editable profile fields beyond name and email
• No native birthday metafield
• No safe way to customize the registration form without Liquid

Developers will tell you this requires metafield definitions, custom inputs, validation logic, API syncing, and email tool integrations.

For merchants, this becomes a high-effort, high-risk task.

The Hard Way (With Code & Liquid)

• Edit customers/register.liquid
• Create a birthday metafield manually
• Map form inputs to metafields
• Handle validation and formatting
• Sync data to Klaviyo and Mailchimp

This approach is fragile. Theme updates can break it, and mistakes impact customer experience.

The Custlo Way (Zero Code)

Custlo allows merchants to add birthday fields using a visual interface.

• Dynamic custom fields
• Automatic metafield creation
• Drag-and-drop form editor
• Registration + account profile support
• Built-in Klaviyo & Mailchimp sync

Using Custlo, you can add a birthday entry metafield to:

• The Shopify registration form
• The logged-in customer account profile

Step 1: Open Custlo Customer Fields

Navigate to Custlo → Customer Fields. This is where all custom customer data is managed.

Step 2: Add the Birthday Entry Metafield

Click Add Field → Birthday Field.

Custlo automatically creates the metafield with proper formatting and syncing.

Step 3: Enable Visibility on Registration

Select Visibility → Show on registration form.

The birthday field now appears on:

• Account registration page
• Signup modals
• Create-account sections

No theme edits required.

Step 1: Open My Profile Layout

Custlo lets you fully customize the customer profile section.

Step 2: Enable Birthday Field for Logged-in Users

Select Visibility → Show in Customer Account & Editable.

Customers can now:

• Add their birthday
• Edit it anytime
• Sync updates instantly to Shopify

Custlo automatically manages metafields behind the scenes.

• Creates the customer metafield
• Stores birthday as a structured date
• Makes it editable
• Pushes it to third-party tools

No manual metafield setup required.

Klaviyo

Birthday data syncs automatically, enabling:

• Birthday email flows
• Reward coupons
• VIP campaigns
• Milestone reminders

Mailchimp

The birthday field is mapped cleanly for:

• Birthday greetings
• Anniversary campaigns
• Reward-based automations

Feature	Default Shopify	Custlo Enhanced
Add birthday field	No	Yes
Editable in account	No	Yes
Registration form support	Requires Liquid	Toggle-based
Email tool sync	Manual	Automatic
Theme safety	Risky	No-code & safe

• 20–30% higher repeat purchases
• Cleaner segmentation
• Stronger personalization
• More complete customer profiles
• Fewer support tickets

A single birthday field significantly increases customer lifetime value.

If you want to collect birthday data across registration and customer accounts—without Liquid, without developers, and without risk:

Start your 14-day free trial of Custlo on the Shopify App Store.