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Fill Form

Fill Form lets you complete a PDF's interactive form fields directly in the viewer and download the filled result. Open a PDF that already contains form fields - text boxes, checkboxes, radio buttons, dropdowns - type your answers into the fields shown on the page, and save the completed document.

Fill Form works with fields that are already in the PDF; it does not add new fields. If a form has no fillable fields, there is nothing to type into.

How to Use​

  1. Open the tool - Select Fill Form from the tools list. It opens in the viewer workbench.
  2. Load a PDF - Upload a PDF that contains form fields. Stirling PDF reads the fields and overlays them on the page.
  3. Fill the fields - Click each field and enter its value. Checkboxes, radio buttons, and dropdowns can be toggled or selected.
  4. Download - Save to export the filled PDF.

How It Differs from Other Form Tools​

  • Fill Form keeps the fields editable - it just populates their values, so the form can still be changed later.
  • Flatten merges form fields into the page so they become part of the static document and can no longer be edited. Use it when you want to lock in answers before sending a final copy. See Flatten.
  • Unlock PDF Forms removes read-only restrictions from fields so locked fields can be edited again. Use it when a form refuses input because its fields are marked read-only. See Unlock PDF Forms.

Notes​

  • Runs in your self-hosted Stirling PDF instance with no external service or credits required. See Modes.
  • The PDF must already contain fillable form fields. PDFs with no fields, or scanned image-only forms, have nothing to fill.
  • Automating form filling? You can do the same thing in a pipeline or script. See the API reference for details.
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