# How to make a fillable PDF without Acrobat

Checked against W3C PDF form field guidance, Library of Congress PDF format descriptions and the editor on this site on November 12, 2026. Updated 2026-11-12. Source page: https://fairfillpdf.com/guides/how-to-make-a-fillable-pdf-without-acrobat/

To make a fillable PDF without Acrobat, add form fields: boxes people can click and type into or tick. Open the PDF here and press Find blanks to add typing boxes on blank printed lines and tick boxes in empty squares. Check each box, add any that were missed, and download. The boxes stay fillable in the downloaded file.

## Making a PDF fillable at a glance

| Symptom | You can’t type directly into the blanks of the PDF |
| --- | --- |
| Cause | The PDF has no form fields there. Form fields include text fields, check boxes, radio buttons and drop-down lists |
| Fix | Press Find blanks, then add any missed boxes with Text box or Checkbox |

## What makes a PDF fillable?

A PDF is fillable when it has form fields, the boxes people click to type into or tick. The W3C lists the form controls a PDF can hold: text fields, check boxes, radio buttons, combo boxes, drop-down lists, push buttons and signature fields.

Preview on a Mac and Microsoft Edge on Windows can fill form fields that a PDF already has. To add form fields to a PDF that has none, follow the steps below.

## How to make a fillable PDF here

1. Open your PDF with the button above. The PDF is never uploaded.
2. Place the $1.99 hold. Nothing is charged until you download, and the hold is released if you don’t download within 24 hours.
3. Press Find blanks. Typing boxes are added on blank printed lines and tick boxes in empty squares, each named after the words next to it.
4. Click each box and type a sample answer to see that it fits. Delete the samples and untick any test ticks before you download, because answers are saved in the downloaded PDF.
5. Drag the dark tab on a box’s left to move it, or pull the yellow corner dot to resize it.
6. Press Name to rename a box, or Delete to remove it.
7. Add any boxes that were missed. Use Text box to drag out a typing box, or Checkbox to add a tick box by hand.
8. Press Download. We charge the $1.99, and the boxes you added stay fillable. If the PDF came with its own form boxes, leave “Lock the form’s answers” off to keep those boxes fillable. To lock them instead, see [how to flatten a PDF](https://fairfillpdf.com/guides/how-to-flatten-a-pdf/).

You can also open your PDF from the [make a PDF fillable](https://fairfillpdf.com/make-pdf-fillable/) page, and the same editor opens it.

## Which lines and squares get a box?

Find blanks puts a typing box above each thin printed line at least 24 points long with blank space above it. A checkbox goes in each empty square 7 to 22 points wide. A page gets at most 150 boxes.

Lines and squares that already have a box, printed words or anything you added are skipped. So is the top edge of a printed box or table. A line that crosses table cells is split at the cell walls, so each empty cell gets its own box and cells with printed words get none.

## When does a box take more than one line?

A drawn text box taller than 30 points accepts several lines of typing. A shorter box takes one line.

New boxes use Helvetica, with no background fill and no border. A checkbox you draw by hand gets a thin border.

## What kind of form fields are added here?

FairFill PDF adds standard AcroForm text boxes and checkboxes, not XFA forms. The Library of Congress says XFA was deprecated in PDF 2.0 (ISO 32000-2). In PDF 2.0, deprecated features should not be written into a document, and a reader should ignore them.

To fill in a form that already has boxes, see [how to fill out a W-9 online](https://fairfillpdf.com/guides/how-to-fill-out-a-w-9-online/), with steps for a real IRS form.

## Questions about fillable PDFs

### Can I start from a Word document?

Yes. Save the document as a PDF, then open the PDF in FairFill PDF and press Find blanks. Draw boxes by hand wherever a blank was missed.

### Can I make a scanned paper form fillable?

Yes. Find blanks works on a picture of each page, so blanks on a scan with dark, straight lines can get boxes too.

### Can I add a signature box?

Not a signature field. Draw a text box on the signature line where the signer can type their name. A signature placed with FairFill PDF’s Sign tool is a picture on the page, with no identity check.

### Can I add drop-down lists or radio buttons?

Not in FairFill PDF. You can add text boxes and checkboxes, and FairFill PDF fills drop-down lists and radio buttons that a PDF already has.

### Do I need Acrobat to make a PDF fillable?

No. FairFill PDF adds the boxes in your browser and saves them as standard AcroForm fields.

### Can I change the boxes after I download?

Yes, for 24 hours in the same browser. Go back to the FairFill PDF editor, fix the boxes and download again; you won’t pay twice for the same PDF.

## Sources

1. [Technique PDF12: Providing name, role, value information for form fields in PDF documents, WCAG 2.2 Techniques, W3C](https://www.w3.org/WAI/WCAG22/Techniques/pdf/PDF12), read November 12, 2026
2. [PDF 2.0, ISO 32000-2 (2017, 2020), Sustainability of Digital Formats, Library of Congress](https://www.loc.gov/preservation/digital/formats/fdd/fdd000474.shtml), read November 12, 2026
3. [PDF, Version 1.7, ExtensionLevel 5, Sustainability of Digital Formats, Library of Congress](https://www.loc.gov/preservation/digital/formats/fdd/fdd000314.shtml), read November 12, 2026
4. [Fill out and sign PDF forms in Preview on Mac, Apple Support](https://support.apple.com/guide/preview/prvw35725/mac), read November 12, 2026
5. [How to use the PDF reader in Microsoft Edge, Microsoft Edge Learning Center](https://microsoft.com/en-us/edge/learning-center/how-to-use-pdf-reader-in-microsoft-edge), read November 12, 2026