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PDF Form Filler
This free PDF form filler opens a fillable PDF form — the kind with real, typeable fields — right in your browser. The tool reads the form's fields and shows them as a simple list: type your answers, tick the boxes, choose from the drop-downs, and download the filled PDF. Everything runs on your own device with a library stored on this website, so bank forms, admission forms and office paperwork are never uploaded anywhere. If your PDF turns out to be a flat scan with no real fields, the tool will tell you honestly instead of pretending.
Form fields
Your file is processed entirely on your device and is never uploaded. The pdf-lib library used by this tool is stored on this website.
How to use this PDF form filler
- Drop your PDF form into the box, or click to browse for it.
- The tool reads the form and lists every field it finds — text boxes, tick boxes, drop-downs and option lists — with the field names from the PDF.
- Type your answers into the list. Leave a field blank if you want it to stay as it was.
- Press "Fill & Download PDF" and save the filled copy.
- Open the downloaded PDF once to check everything landed in the right place before you send it on.
How PDF forms work
A fillable PDF contains an invisible layer called an AcroForm: a set of named fields — text fields, checkboxes, radio groups and drop-down lists — placed over the printed page. When you type in a PDF reader, you are really filling this layer, not editing the page itself. This tool uses the pdf-lib library, stored on this website, to read that layer from your file, present each field as an ordinary web input, write your values back into the same fields, and save a new copy.
Because the values are written as real form data, the filled PDF behaves exactly like one you filled in a desktop reader: the text can be selected, the form can be filled further, and the file size barely changes. If you want to lock the answers so they cannot be edited, run the result through the Flatten PDF tool linked below — that bakes the values into the pages themselves. One honest limit: a scanned form, or a form that was "printed to PDF", has no field layer at all. It is just a picture of a form. This tool will find no fields in such a file and will say so; for those, print-and-sign or your PDF software's "prepare form" feature is the way.
Worked example
Suppose you download your bank's account-opening form as a PDF. You drop it into the box and the tool confirms: ✓ Chosen: account-form.pdf (148 KB). It finds 9 fields and lists them: Full Name (text), Date of Birth (text), Mobile Number (text), Account Type (drop-down: Savings / Current), SMS Alerts (a tick box), and four more. You type your name, date of birth and mobile number, pick "Savings", tick SMS Alerts, and press the fill button. Seconds later account-form-filled.pdf downloads with every answer sitting neatly in its box — no printer, no pen, no scanning.
Field types you may see
| Field in the PDF | What this tool shows you |
|---|---|
| Text field | A text box — type freely; long answers are fine |
| Checkbox | A tick box — tick it to select the option |
| Drop-down list | A drop-down with the form's own choices |
| Radio buttons | A drop-down of the options — pick one, or leave unchanged |
| Signature field | Listed as not supported — sign after printing, or in your PDF reader |
Field names come from the PDF itself. Well-made forms use clear names like "Full Name"; some forms use names like "Text12" — in that case, fill the value, download, and check the result to see where it landed.
Frequently asked questions
Is my PDF uploaded to a server?
No. The file is opened and filled entirely in your browser using the pdf-lib library stored on this website. Your document never leaves your device, so the tool is safe for bank forms, admission forms and other private paperwork. Nothing is stored after you close the page.
The tool says my form has no fields. Why?
Your PDF is a flat document — most likely a scan, a photo-based PDF, or a form that was printed to PDF, which removes the field layer. Such files are just pictures of a form and contain nothing to type into. You can print and fill it by hand, or open it in PDF software that can detect and create fields. Genuine fillable forms — the kind where boxes highlight when you click them in a reader — work here.
Can I edit the filled values later?
Yes. The values are written as normal form data, so the filled PDF can be opened in any PDF reader and changed like the original form. If you need the opposite — answers locked so nobody can alter them — run the downloaded file through the Flatten PDF tool linked below, which presses the values into the pages.
Can I sign the form with this tool?
No. Digital signature fields need a certificate and a signing process that this simple filler does not handle, and it skips signature fields rather than faking them. Fill everything else here, then sign the printed copy by hand, or use your PDF reader or your organisation’s signing service for a digital signature.
My PDF is password-protected. Will it work?
If the PDF needs a password just to open, this tool cannot read it and will show an error. Remove the password first with a tool you trust, on a copy you are allowed to change, and then fill it here. A PDF that opens freely but restricts editing may still work — the tool will tell you if it cannot save the filled copy.