PDF Form Automation • PrefillPDF API

Fill PDF Forms with an API

Map your PDF fields once, send data from any application, and receive a completed PDF in seconds.

Updated·Jul 13, 2026

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Explore: API Docs · Use Cases · Pricing · Form Field Extraction

What you can do with Fill PDF Forms API

Use Existing Forms

Keep the PDF templates your team already uses.

Accurate Field Mapping

Send values to exact form field names.

Fast API Responses

Generate completed forms on demand.

Workflow Ready

Connect CRMs, databases, and no-code tools.

Secure Processing

Process form data through a controlled API flow.

Scales Easily

Generate one form or thousands of forms.

How it works

1
Upload a PDF template
Add the fillable PDF you want to automate.
2
Identify the form fields
Use the field names from your template.
3
Send your data
Call the API with the template and mapped values.
4
Receive the completed PDF
Download or route the generated document.

Common workflows

Customer Applications

Prefill customer and business information.

HR Documents

Generate onboarding and employee forms.

Government Forms

Automate repeated public-form workflows.

Insurance Forms

Map policyholder and claim information.

Loan Documents

Generate borrower-ready application PDFs.

Registration Forms

Create completed forms from submitted data.

Benefits

Eliminate repetitive typing

Reduce field-entry errors

Keep existing PDF layouts

Connect forms to your app

Automate high-volume workflows

Standardize every generated form

Related PDF API features

Extract JSON from PDF API

Convert PDF documents into structured JSON that is easier to validate, analyze, store, and send into automated workflows.

PDF Form Field Extraction API

Detect and return available PDF form field names so developers can map data accurately before generating documents.

Extract Text from PDF API

Extract and clean readable text from PDF files for search, summaries, analysis, classification, and automated workflows.

PDF Watermark API

Add text or image watermarks to PDF documents automatically through an API-driven workflow.

FAQ

Can I use my existing fillable PDF?

Yes. Upload your existing PDF template and map its field names to your data.

Can I fill forms from a CRM?

Yes. Send CRM data directly through the API or use an automation platform.

Can I generate forms in bulk?

Yes. The same template can be reused for high-volume generation.

Do users need to edit the PDF manually?

No. The API can return a completed PDF using the values you provide.

Can some fields remain empty?

Yes. Only send the fields you want to fill.

Start using Fill PDF Forms API

Connect your PDF workflow to PrefillPDF and automate document processing from your application.