Form Filler - Free Online PDF Tool

Fill existing PDF forms directly in your browser. Upload a PDF, detect fillable AcroForm fields automatically, enter values for each field, and download the completed document — all processed locally with zero server uploads. Switch to Flatten Text mode to add freeform text at any page position when no fillable fields are found.

How to Use

1. Click Select PDF File and choose a PDF containing fillable AcroForm form fields.
2. The tool automatically scans the document and displays every detected field in a fillable form.
3. Enter your values into each field or switch to Flatten Text mode to add free text at a specific page position.
4. Click Fill & Download PDF to generate and save your completed document locally.

Key Features

• Auto-detect AcroForm fields
• Fill form values interactively
• Flatten text at custom position
• Adjust font size and coordinates
• Process entirely offline locally
• Download filled PDF instantly

Frequently Asked Questions

Does this tool upload my PDF to a server?

No. All processing happens entirely within your browser using JavaScript libraries. Your PDF file is never transmitted to any external server, ensuring full privacy and data security.

What if my PDF has no fillable form fields?

The tool will detect that no AcroForm fields exist and prompt you to switch to Flatten Text mode. You can then add plain text at any X and Y position on a specific page with adjustable font size.

Can I fill multiple PDFs at once?

This tool handles one PDF at a time. Upload each file individually, fill its fields, download the result, and repeat for additional documents.

Does it support scanned or image-only PDFs?

Not directly. Scanned PDFs have no interactive form fields. Use Flatten Text mode to overlay text at chosen positions, but note this is manual placement rather than field-based filling.

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Maintained by Huang Bin · Last updated October 3, 2026