What types of PDF forms are supported?

The tool supports standard AcroForm PDFs. For hybrid PDFs containing XFA, the tool can remove the XFA packet to fill the AcroForm fallback fields.

Can I keep the PDF editable after filling it?

Yes, by disabling the 'Flatten Filled Fields' option, the resulting PDF will retain its interactive form fields.

What happens if a field name in my JSON doesn't match the PDF?

If 'Strict Mode' is enabled, the process will fail. Otherwise, the tool will skip the unmatched field and continue processing the rest.

Does this tool support pure XFA-only forms?

No, pure XFA-only forms are not supported. They must be converted to standard AcroForm format before processing.

Is there a limit to the file size I can upload?

The tool supports PDF files up to 100MB.

Elysia Tools

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PDF Tools

PDF AcroForm Filler

Fill standard PDF forms programmatically (text, checkbox, radio, dropdown/list) using JSON data injection

Details

What this tool helps you do

Programmatically fill PDF form fields and export a filled PDF.

Engine selection:

Primary library: pdf-lib

Supported injection:

Text fields
Checkboxes (true/false/yes/no)
Radio groups
Dropdown and option list selections

AcroForm/XFA behavior:

Fully supports AcroForm filling
For hybrid PDFs that include XFA, can remove XFA packet and fill AcroForm fallback fields
Pure XFA-only forms are not directly writable by pdf-lib and should be converted upstream

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

Fill Basic Registration Form

Inject text, checkbox, radio, dropdown and list values into an AcroForm PDF

{
  "type": "file",
  "filePath": "/public/samples/pdf/pdf-acroform-filler-example1.pdf"
}

Fill Without Flattening

Fill selected fields and keep form editable by disabling flattening

{
  "type": "file",
  "filePath": "/public/samples/pdf/pdf-acroform-filler-example2.pdf"
}

Inputs

Set the required fields, then run the tool.

5 options

FilesUpload source files for this workflow.1

PDF Form FilefileRequired

Single file max size: 100 MBSupported types: application/pdf

ContentPaste or type the main input values.1

Field Data JSONtextareaRequiredJSON object where key = field name, value = field value

TogglesEnable or disable optional behavior.3

Remove XFA Before FillcheckboxOptionalEnabled when checkedFor hybrid PDFs, remove XFA packet and fill AcroForm fallbackFlatten Filled FieldscheckboxOptionalEnabled when checkedFlatten fields to make result non-editableStrict ModecheckboxOptionalEnabled when checkedFail immediately when any field cannot be mapped/written

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

PDF AcroForm Filler

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

Continue with connected tools and hubs

Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Automated Registration Form Filling

2. Drafting Editable Contracts

FAQ

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