Add Lead Source to your website

Adding Lead Source is a one-time job. Once it’s in place, every form submission on your site is captured automatically — you never touch it again.

The line you add

In your Lead Source account, open Settings → Sites and copy your snippet. It looks like this:

<script async src="https://track.yourdomain.com/ft.js"
        data-site="YOUR_SITE_KEY"></script>

Paste it just before the closing </body> tag on your website, on every page that has a form. That’s it.

Use your own domain

For the most reliable capture, point a subdomain you control — for example track.yourdomain.com — at Lead Source. This keeps everything first-party to your site, so it works even for visitors with ad or privacy blockers turned on. Your setup screen shows the exact record to add:

track.yourdomain.com   CNAME   form-track-sooty.vercel.app

If you’d rather not set up a subdomain, the default address still works for most visitors — a subdomain just covers the last few percent.

Platform-by-platform

Raw HTML

Paste the snippet before </body> in your page template. If your site is several separate HTML files, add it to each one that has a form (or to a shared footer include).

WordPress

Two easy options:

• Theme footer: Appearance → Theme File Editor → footer.php, paste before </body>.
• A header/footer plugin: any “insert headers and footers” plugin — paste the snippet into the footer box.

Works with Contact Form 7, Gravity Forms, and other common form plugins with no extra steps.

Webflow

Project Settings → Custom Code → Footer Code, paste the snippet, save, and publish. Webflow’s native forms are captured automatically.

Squarespace

Settings → Advanced → Code Injection → Footer, paste the snippet, save. Native Squarespace forms are captured.

Other builders

Most site builders have a “custom code” or “footer scripts” box — that’s where the snippet goes. If yours embeds forms from another service (for example a form shown inside a frame), see Troubleshooting for the extra step some of those need.

How to know it worked

1. Add the snippet and publish your site.

2. Open your Lead Source account. On your setup checklist you’ll see a “We can see your site” confirmation appear within a minute or two of someone (including you) loading a page.

3. Submit a test through one of your forms and watch it appear in your leads. Full walk-through: See your first lead.

Nothing showing up? Head to Troubleshooting →.