Form Guard
Email Verification Widget for Web Forms
Drop-in JavaScript email validation for any HTML form. Block disposable emails, catch typos, and verify addresses in real-time — no backend code required.
Live Preview
See Real-Time Email Validation in Action
The widget validates emails as users type. You see everything in your dashboard.
Create Account
Waiting for validation...
Benefits
Why Add Email Validation to Your Forms
Zero Backend Required
Add a single script tag and the widget handles everything. No server code needed.
Instant Feedback
Users see validation results as they type — catch errors before form submission.
Fully Customizable
Style the widget to match your brand. Control colors, messages, and behavior.
Framework Agnostic
Works with any HTML form — React, Vue, Angular, WordPress, or plain HTML.
Integration
Install the Email Checker Widget in 3 Steps
Add the script tag
<script
src="https://mailchk.io/widget.js"
data-api-key="YOUR_API_KEY"
data-selector="input[type=email]"
></script>Add an email input to your form
<input type="email" name="email" placeholder="Enter your email" />Done! The widget handles the rest
The widget automatically attaches to your email inputs, validates as users type, and shows inline feedback with typo suggestions.
Add Email Verification to Your Forms Today
Get started with 200 free validations. Takes less than a minute to set up.