# Fill in PDF forms, or turn any PDF into a fillable form

Source: https://www.mergevanta.com/fill-pdf-forms
Updated: 2026-10-22

> Fill PDF forms online free: type answers, tick boxes, pick options and flatten — or add fillable fields to any PDF. No watermark, no sign-up, no upload.

Fill in a PDF form's text boxes, checkboxes, radio buttons and dropdowns, and flatten it if the answers shouldn't change. No fields? Draw them and get a fillable PDF. Free, with no watermark, all in your browser.

## How do I fill in a PDF form online for free?

Add the form to Mergevanta's PDF forms tool. Its fields appear as a simple list — text boxes, checkboxes, radio buttons and dropdowns — with readable labels and page numbers. Fill them in, turn on Flatten form if it should be read-only, and press Save filled PDF. Everything runs in your browser.

## Key facts

- **Price:** Free
- **Watermark:** None
- **Sign-up:** Not required
- **Accepts:** .pdf
- **You get:** The filled (or newly fillable) .pdf
- **Processing:** In your browser — files never leave your device
- **Files stored:** Never
- **Works on:** Windows, macOS, Linux, iPhone, iPad and Android

## Why use Mergevanta

- **Every field in one list:** Fields are listed with readable labels and page numbers. Tap one and its box lights up on the page; tap a box on the page to jump to its field.
- **Flatten when you're done:** Draw the answers into the pages so the form becomes read-only — or keep it fillable for the next person.
- **Make any PDF fillable:** No fields? Draw text fields, checkboxes and dropdowns, name them, and get real form fields that Acrobat, Chrome and other readers can fill in.
- **Answers in many languages:** Hindi, Bengali, Tamil, Greek, Cyrillic, Chinese and more are written with an embedded Noto font holding only the characters you typed.

## How to use it

1. Press Choose PDF and open your form.
2. Fill in the fields in the list, or tap a box on the page to jump to its field.
3. Turn on Flatten form (make it read-only) if the answers shouldn't change.
4. Press Save filled PDF, then Download.
5. No fields? Draw a Text field, Checkbox or Dropdown on the page, name it and press Create fillable PDF.

## Frequently asked questions

### Which PDF forms can I fill in?

Standard PDF forms (AcroForm): text fields, multi-line text, checkboxes, radio buttons, dropdowns and lists. Forms built with XFA, an older Adobe format, can't be filled here — the tool tells you when it finds one.

### What does flattening a form do?

It draws each answer into the page and removes the fields, so the form can't be edited any more and looks the same in every reader. Keep a fillable copy if you might need to change an answer.

### Are my answers uploaded?

No. The form is filled in and saved by your browser. When an answer needs a font for another script, only that font is downloaded from a public font CDN; your PDF and answers stay on your device.

### Do calculations and scripts in the form run?

No. Scripts such as totals or input checks are kept in the file untouched but never run here. They run when the PDF is opened in a reader that supports them.

### Can I make a fillable PDF from a plain or scanned PDF?

Yes. When a PDF has no fields, draw text fields, checkboxes and dropdowns on it. The result has real form fields that Acrobat, Chrome, Edge and other PDF readers can fill in.

### Can I fill in a PDF form on my phone?

Yes. The fields are a simple list that works with your phone's keyboard, and the page preview shows each answer in its box as you type.

### Can I sign the form too?

Signature fields can't be signed in this tool. Fill in the form, save it, then add your signature with [Sign PDF](https://www.mergevanta.com/sign-pdf).

## Related tools

- [Sign PDF](https://www.mergevanta.com/sign-pdf)
- [Edit PDF](https://www.mergevanta.com/edit-pdf)
- [Protect PDF](https://www.mergevanta.com/protect-pdf)