Fill PDF forms on your computer

Complete text fields, checkboxes and dropdowns, and optionally flatten the form to make it permanent. Free and 100% private.

100% private: everything runs on your computer, your files never leave your device.

Upload your PDF - it opens locally on your computer
Fill in the form fields
Download the filled (or flattened) PDF

What Fill PDF Form does

Fill PDF Form opens a PDF that already contains form fields, lists every field it finds and lets you type or pick the answers from your browser. When you save, the values are written into the document as real field data, so the result opens filled in any PDF reader. If you tick Flatten the form, the fields are turned into fixed page content and can no longer be edited, which is what most recipients expect from a finished document.

It exists for the forms that arrive by email or get downloaded from a website: an application form, a school authorization, a customer questionnaire, a supplier registration. Instead of printing, writing by hand and scanning, you fill it on screen and send the PDF back. The document and everything you type stay on your computer.

How to fill in a PDF form

Add the PDF. The tool takes one file at a time and reads its form fields as soon as it opens.
Go through the list of fields. Each one is labelled with the name it has inside the PDF: text fields appear as text boxes, checkboxes as checkboxes, and radio groups, dropdowns and list boxes as selectors with the options defined in the form.
Type or choose your answers. There is nothing to submit in between; the values live only in your browser until you save.
Decide whether to tick Flatten the form. Leave it unticked if the recipient should still be able to edit the fields; tick it to make your answers permanent.
Press Save form. The completed PDF is generated on your device and downloaded with the suffix _filled and a timestamp.

Supported fields and limits

The tool works with the standard PDF form model, AcroForm, and writes the values with a local PDF library. It regenerates the appearance of each field so the answers render correctly in any viewer, embedding a Unicode font when you use accents, Cyrillic or other non-Latin characters.

Text fields, checkboxes, radio groups, dropdowns and list boxes are supported. Signature fields and buttons are not shown.
XFA forms, the XML based format used by some government and banking documents, expose no fields to the tool. In that case you will see the message This PDF has no form fields.
Text is entered on a single line per field; long answers still fit, but line breaks are not preserved.
The form is filled one document at a time. There is no batch mode in this tool.
Password-protected PDFs are not accepted. Unlock the file first, then fill it.
Flattening is permanent in the downloaded copy. Keep the original if you might need to change an answer later.

Privacy: your answers never leave the browser

Reading the fields, writing the values and flattening are all done by a PDF library that runs inside your browser tab. The document is not uploaded, the answers are not sent anywhere, and no third-party script is loaded. The only network request that may happen is the download of a Unicode font from OléPDF's own domain when your text needs it. Once the tab is closed, no trace of the form or its content remains outside your computer.

This is what makes the tool appropriate for forms that ask for identity numbers, bank details or health information: the data goes from your keyboard to a file on your disk and nowhere else.

Typical uses

Completing an enrolment, grant or membership form received as a PDF and returning it by email without printing it.
Filling in a template you reuse often, such as a delivery note or an inspection sheet, and flattening it so the copy you send cannot be altered.
Answering a customer or employee questionnaire on a laptop while keeping the personal data off any online service.

Frequently asked questions

Is filling PDF forms free?

Yes. The tool is free and unlimited, with no account, no watermark and no daily cap on the number of forms you complete.

What does Flatten the form do exactly?

It converts the fields and your answers into ordinary page content. The values stay visible in any reader, but nobody can click into a field and change them. Leave it unticked if the form should remain editable.

Why does it say This PDF has no form fields?

The document either has no interactive fields at all, for example a scanned form, or uses the XFA format, which the tool cannot read. For a scanned or static form, use Edit PDF to write over the page, or the form builder to add fields.

Can I fill several forms at once?

No. This tool handles one PDF per run. The related Flatten PDF tool does accept batches for flattening already completed forms.

Will accents and special characters display correctly?

Yes. If the form's own font cannot show a character, the tool embeds a Unicode font so the answer renders properly in the saved PDF.

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