Mastering ConvertKit: How to Use Custom Fields and Tags Effectively

Introduction

If you’ve ever felt stuck with generic email lists, ConvertKit’s custom fields and tags are the game‑changing tools you need. They let you capture granular subscriber data and segment your audience with laser precision, boosting open rates and conversions.

What Are Custom Fields?

Custom fields are extra data points you can attach to a subscriber profile—think first name, city, product preference, or even subscription tier. Unlike standard fields, they’re completely configurable, so you only collect what matters to your business.

Why Use Custom Fields?

• Personalization: Insert the exact data you need into emails (e.g., “Hey {{ subscriber.city }}, check out our local event!”).
• Dynamic Content: Show or hide sections of a broadcast based on field values.
• Better Segmentation: Combine fields with tags for hyper‑targeted sequences.

Setting Up Custom Fields in ConvertKit

1. Navigate to Subscribers > Settings > Custom Fields.
2. Click + Add Field and name it (e.g., favorite_product).
3. Choose the field type: text, number, date, or dropdown.
4. Save – the field is now available in forms, landing pages, and the API.

Understanding Tags

Tags are simple labels you assign to subscribers to indicate interest, behavior, or status (e.g., webinar_attended, VIP_customer). They’re flexible, instantly searchable, and can trigger automations.

Best Practices for Tagging

• Keep it flat: Avoid nested tags; use clear, consistent naming (e.g., product_ebook instead of ebook).
• Limit the total: Too many tags can clutter reports. Aim for 5‑10 core tags per subscriber.
• Automate: Use forms, link clicks, or API calls to add tags automatically.

Combining Custom Fields & Tags for Powerful Segments

When you pair a custom field value with a tag, you unlock ultra‑specific segments. Example:

Subscribers who have the tag "course_enrolled" AND the custom field "course_level" = "advanced"

This segment can receive a tailored nurture series that only advanced learners see.

Step‑by‑Step Example

1. Create a custom field course_level with options "beginner", "intermediate", "advanced".
2. Add a tag course_enrolled to anyone who signs up for a course.
3. In the Subscribers page, filter by Tag = course_enrolled and Field = course_level:advanced.
4. Build a broadcast or automation that delivers advanced‑level resources only to this group.

Automation Triggers Using Fields and Tags

ConvertKit allows you to start a sequence when a subscriber meets both criteria:

WHEN Tag "lead_magnet" is added AND Custom Field "interest" equals "photography" → Start "Photography Starter Series"

This reduces manual list management and ensures every subscriber gets the right content at the right time.

FAQ

• Can I edit a custom field after a subscriber submits it? Yes—update it manually in the subscriber profile or via the API.
• Do tags affect deliverability? Tags are internal labels; they don’t impact inbox placement.
• Is there a limit to the number of custom fields? ConvertKit allows up to 30 custom fields per account.
• How do I remove a tag from a subscriber? Open the subscriber’s profile, click the tag, and select “Remove”.
• Can I use custom fields in email subject lines? Yes—wrap the field in double curly braces (e.g., {{ subscriber.favorite_product }}).

Conclusion

Custom fields and tags are the backbone of a smart ConvertKit strategy. By capturing detailed data, organizing it with clear tags, and automating based on both, you’ll deliver personalized experiences that convert.

Call to Action

Ready to supercharge your email marketing? Book a free conversion audit today and see how custom fields and tags can double your engagement.