Which field types are supported?

Text fields (AcroForm Tx). Checkboxes, radio buttons, dropdowns and signature fields are detected but not editable in this version — use a desktop tool for those.

What if my PDF has no form fields?

Switch to the “Manual text overlay” section and place text at specific X/Y coordinates. This is the same approach used by the Edit PDF tool.

Is my form data uploaded?

No. Filling happens entirely in your browser via pdf-lib.

Can I save the form as a flatten PDF?

After filling, use the PDF Form Flattener tool to bake values into the page content.

Fill PDF Forms

Fill AcroForm text fields or overlay text at custom positions.

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How to use Fill PDF Forms

Follow these steps — everything happens instantly in your browser.

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Step 1. Drop a PDF onto the zone — the tool detects AcroForm fields automatically.
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Step 2. Type values into each detected field, or use “Add” for manual text overlay.
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Step 3. Click “Fill & download” to save the completed PDF.