PDF Form Filler
Open a fillable PDF, complete its fields in the browser and download — optionally flattened.
How to use the PDF Form Filler
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Open a fillable PDF.
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Complete the detected fields.
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Download, flattened or still editable.
How to fill a PDF form
A PDF form filler lets you complete interactive (AcroForm) fields — text boxes, checkboxes, radio buttons and dropdowns — without printing. This tool reads the form fields with pdf-lib, renders an input for each, writes your answers back, and optionally flattens them. All of it happens in your browser.
Key features
- Detects text, checkbox, radio and dropdown fields
- Fill everything in the browser
- Optionally flatten on download
- Runs fully client-side
Frequently asked questions
What if my PDF has no form fields?
This tool fills existing interactive fields. If a PDF has none, use Sign PDF or PDF Annotator to add content instead.
Can I lock my answers?
Yes — choose to flatten on download so the values become permanent.
Is my form uploaded?
No. Filling happens locally in your browser.