An opt-in form is a form, placed on a website, that collects a visitor's contact information — typically an email address — with their explicit, active consent to receive further communication. It's the primary mechanism most sites use to actually build an email list.
Common Types of Opt-in Forms
- Popup forms — appear over the page content, often timed or triggered by specific behaviour
- Inline forms — embedded directly within a page's regular content
- Slide-in forms — appear gently from a corner of the screen as a visitor scrolls
- Exit-intent forms — trigger specifically when a visitor appears about to leave the page
What Makes an Opt-in Form Actually Convert
- A clear, genuinely compelling value proposition explaining exactly what's on offer
- Minimal required fields — usually just a name and an email address
- Strong, specific call-to-action text rather than a generic "Submit" button
- Sensible, well-considered timing and placement on the page
Building Opt-in Forms in WordPress
Plugins like OptinMonster, Bloom, or the built-in forms of an email marketing platform such as ConvertKit all make building and placing opt-in forms straightforward, without needing to write any code directly.
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