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Fill PDF Form

Fill interactive form fields in any PDF document.

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Tool settings

Processing runs in your browser where possible, so selected files do not leave this page.

Why use PDFlexa to Fill PDF Form?

Fill fields by name

Enter values in "FieldName: value" format and PDFlexa matches them automatically.

Supports text and checkboxes

Fill text fields and check boxes using simple "yes" or "true" values.

Discover field names easily

Run once without values to see a list of all fillable field names.

Private, browser-based

All processing happens locally — your form is never uploaded to a server.

How to Fill PDF Form online — step by step

  1. Upload your PDF form — Select the interactive PDF form you want to fill in.
  2. Enter field values — Type field values in "FieldName: value" format, matching the form's field names.
  3. Download the filled PDF — Get your completed form with all values filled in automatically.
Want a deeper guide? Read our step-by-step article on how to use this tool.
Read the guide →

Frequently asked questions about Fill PDF Form

How do I fill in the PDF form fields?

Upload your PDF, then enter field values in the format "FieldName: value, AnotherField: value2" in the Field values box. The tool matches field names and fills them automatically, then returns the completed PDF.

How do I find the names of the form fields?

Process the PDF once without any field values. The result message will list all available field names, which you can then use to fill in the correct values on the next run.

What field types are supported?

Text input fields, checkboxes, and dropdown selects are supported. For checkboxes, use "yes", "true", or "1" as the value to check them. Radio buttons and digital signature fields are not currently supported.

Is the Fill PDF tool free?

Yes. Fill interactive PDF form fields for free — no account or software required. All processing happens in your browser and the file is never uploaded to a server.