Do you have a fillable form that you want to fill in with data from the Webflow form submission? PDF.co Web API can help you fill out those fillable fields using Zapier. We have a step-by-step guide below that you can follow to solve your problems.
Here’s a step-by-step guide:
- Create a Zap
- App and Event
- Form Submission in Webflow
- Test Trigger
- Test Trigger Result
- Add Another App and Event
- PDF Filler Configuration
- Test and Review
- Test Result
- Output
We will use this sample fillable form in this tutorial:

Step 1: Create a Zap
First, log in to your Zapier account and click Create Zap.
Step 2: App and Event
Next, select the Webflow app and choose the Submission Form to trigger when a new form submission occurs.
Step 3: Form Submission in Webflow
Now, let’s configure the Submission Form.
- For the Site Name field, select the site that you would like to receive notifications from.
- In the Form Name field, enter the form you have published.
Step 4: Test Trigger
Click on the test trigger button to ensure that there are no errors in the setup.
Step 5: Test Trigger Result
Once the test trigger was successful. You can move on to add another app.
Step 6: Add Another App and Event
Now, let’s add another app. Kindly select the PDF.co app and choose the PDF Filler to fill out the fillable form.
Step 7: PDF Filler Configuration
Now, let’s set up the action event.
- In the Source PDF field, input the source PDF URL or the IRS Form 1040 link.
- In the Fillable fields, enter the page number, the field name, and the value. You can use the PDF.co Request Tester to get the form’s field names.
Step 8: Test and Review
You may now send the PDF Filler to PDF.co to test and review.
Step 9: Test Result
Great! We got a successful test result. You can copy and paste the URL to view the output.
Step 10: Output
Here is the output that we successfully filled out with the Webflow form submission data.

In this tutorial, you learned how to fill in and submit a Webflow form to the Webflow CMS using Zapier. You learned how to fill in the fillable form with Webflow form submission data using PDF.co. You also learned how to easily get the PDF Form fields using the PDF.co Request Tester.