How to Add a WhatsApp Button to Your Website

Adding a WhatsApp button to your website is one of the most practical ways to communicate with visitors instantly. Instead of sharing your phone number directly, a button that opens a WhatsApp conversation with a single click improves user experience and increases conversion rates.

What is the wa.me Link?

WhatsApp provides wa.me as its official redirect service. The format is:

https://wa.me/<phone_number>

You need to write the phone number including the country code, without a leading + or 0. Example for the US:

https://wa.me/12125551234

A pre-filled message can also be added:

https://wa.me/12125551234?text=Hello%2C%20I%20would%20like%20to%20get%20information.

Basic HTML Button

The simplest form of a WhatsApp button:

<a href="https://wa.me/12125551234" target="_blank" rel="noopener noreferrer">
  Chat on WhatsApp
</a>

target="_blank" opens it in a new tab, and rel="noopener noreferrer" is recommended for security.

Styled Button (HTML + CSS)

A green-colored button matching the WhatsApp brand:

<a href="https://wa.me/12125551234"
   target="_blank"
   rel="noopener noreferrer"
   class="whatsapp-btn">
  <svg width="20" height="20" fill="currentColor" viewBox="0 0 24 24">
    <path d="M17.472 14.382c-.297-.149-1.758-.867-2.03-.967-.273-.099-.471-.148-.67.15-.197.297-.767.966-.94 1.164-.173.199-.347.223-.644.075-.297-.15-1.255-.463-2.39-1.475-.883-.788-1.48-1.761-1.653-2.059-.173-.297-.018-.458.13-.606.134-.133.298-.347.446-.52.149-.174.198-.298.298-.497.099-.198.05-.371-.025-.52-.075-.149-.669-1.612-.916-2.207-.242-.579-.487-.5-.669-.51-.173-.008-.371-.01-.57-.01-.198 0-.52.074-.792.372-.272.297-1.04 1.016-1.04 2.479 0 1.462 1.065 2.875 1.213 3.074.149.198 2.096 3.2 5.077 4.487.709.306 1.262.489 1.694.625.712.227 1.36.195 1.871.118.571-.085 1.758-.719 2.006-1.413.248-.694.248-1.289.173-1.413-.074-.124-.272-.198-.57-.347m-5.421 7.403h-.004a9.87 9.87 0 01-5.031-1.378l-.361-.214-3.741.982.998-3.648-.235-.374a9.86 9.86 0 01-1.51-5.26c.001-5.45 4.436-9.884 9.888-9.884 2.64 0 5.122 1.03 6.988 2.898a9.825 9.825 0 012.893 6.994c-.003 5.45-4.437 9.884-9.885 9.884m8.413-18.297A11.815 11.815 0 0012.05 0C5.495 0 .16 5.335.157 11.892c0 2.096.547 4.142 1.588 5.945L.057 24l6.305-1.654a11.882 11.882 0 005.683 1.448h.005c6.554 0 11.89-5.335 11.893-11.893a11.821 11.821 0 00-3.48-8.413z"/>
  </svg>
  Chat on WhatsApp
</a>

.whatsapp-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: #25D366;
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(37, 211, 102, 0.35);
}

.whatsapp-btn:hover {
  background: #20BD5A;
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.5);
}

Fixed Floating Button (Corner)

A corner button that remains visible as the visitor scrolls:

<a href="https://wa.me/12125551234"
   target="_blank"
   rel="noopener noreferrer"
   class="whatsapp-float"
   title="Contact via WhatsApp">
  <svg width="28" height="28" fill="currentColor" viewBox="0 0 24 24">
    <!-- same SVG path as above -->
  </svg>
</a>

.whatsapp-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  background: #25D366;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(37, 211, 102, 0.45);
  z-index: 999;
  transition: transform 0.2s, box-shadow 0.2s;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(37, 211, 102, 0.6);
}

Important Notes

Phone number format: Do not add +, 00 or 0 at the beginning of the number in the wa.me link. Write country code + number directly: 12125551234

Pre-filled message: Don’t forget to URL-encode special characters in the ?text= parameter. Use %20 for spaces, %2C for commas. A safer approach is to use JavaScript’s encodeURIComponent():

const phone = '12125551234';
const message = 'Hello, I would like to get information.';
const url = `https://wa.me/${phone}?text=${encodeURIComponent(message)}`;

Mobile vs desktop: The wa.me link opens the WhatsApp app on mobile devices and WhatsApp Web on desktop. No extra configuration needed.

WhatsApp Business: If you use WhatsApp Business instead of personal WhatsApp, the same wa.me link works. The number doesn’t change.

How I Implemented It on My Site

On this site, I use WhatsApp buttons both in the Hero section buttons and at the bottom of the contact page. Since I generate a static site with Astro.js, the buttons render directly as HTML without needing any JS library.

For the button design, I used WhatsApp’s brand color #25D366 by overriding the border-color and color inline styles on the btn-outline CSS class.