Start with Adobe Acrobat, not Reader

To create a fillable PDF, you need Adobe Acrobat (the paid desktop application), not Adobe Reader (the free viewer). Adobe Reader cannot add form fields — it can only fill out forms someone else created. Acrobat comes as a standalone purchase or as part of Creative Cloud, and it runs on Windows and Mac.

If you already have a PDF open in Reader and try to look for form-creation tools, you won't find them. You'll need to open the same file in Acrobat instead. The two programs look similar, but only Acrobat has the Prepare Form tool.

Key Takeaways

  • Adobe Acrobat (paid) creates fillable PDFs; Adobe Reader (free) cannot, so make sure you have the right program installed.
  • The Prepare Form tool in Acrobat detects form fields automatically if your PDF came from a scanned document or has obvious text boxes, but you may need to add or adjust fields by hand.
  • You can add text fields, checkboxes, radio buttons, dropdown lists, and signature boxes — each one takes a few clicks to set up.
  • Test your form by clicking the Preview button before you share it, so you catch missing fields or labels that don't line up.
  • Save the finished form as a PDF, then share it by email or link; people can fill it out in Reader or a web browser without needing Acrobat.

Use Prepare Form to detect fields automatically

Open your PDF in Acrobat and go to the Tools menu. Click Prepare Form. Acrobat will scan the document and try to find places where someone should type or click. If your PDF came from a scanned paper form or has clear text boxes and checkboxes, Acrobat often detects them correctly and adds fields automatically.

After Acrobat finishes scanning, you'll see the form with detected fields outlined in blue. Some will be labeled already (if the PDF had text nearby), and some will be blank. You can accept the ones that look right and skip to editing the rest, or you can delete all of them and add fields manually if the auto-detection missed the mark.

The Prepare Form tool works best on forms that have a clear layout — boxes in straight lines, labels above or beside them. If your PDF is a photograph of a handwritten form or has an unusual design, auto-detection may struggle, and you'll spend more time fixing fields than you would adding them by hand.

Add and edit form fields by hand

Whether you used Prepare Form or started from scratch, you'll need to add or adjust individual fields. In the Prepare Form view, the toolbar on the right shows the field types you can insert: Text Field, Checkbox, Radio Button, Dropdown List, Listbox, Button, and Signature Field.

To add a field, click the field type you want, then click and drag on the PDF where you want it to appear. A small dialog box opens where you can name the field (for example, "First Name" or "Date of Birth") and set basic properties. The field name is what appears in the form data when someone submits it, so use clear, simple names without spaces.

To edit a field you've already created, double-click it. You can change the name, set a default value, require the field to be filled in, or limit what kind of text someone can type (numbers only, a specific format, a maximum length). For dropdown lists and radio buttons, you'll add the options people can choose from — one per line.

Set field properties to control what people enter

Each field type has properties you can adjust. For a text field, you can decide whether it accepts any text, only numbers, only dates in a specific format, or only a certain number of characters. You can also make a field required, so the form can't be submitted without an answer.

For checkboxes and radio buttons, you choose what value gets recorded when someone checks the box — usually "Yes" or "No", or the name of the option. Radio buttons work in groups: if you create three radio buttons with the same field name, only one can be selected at a time. Checkboxes with the same name work independently.

Signature fields let someone sign the form digitally using their trackpad, mouse, or a stylus. You don't need to set up anything special — just place the field where the signature should go, and Acrobat handles the rest when someone fills out the form.

Arrange and align fields so the form looks clean

After you've added all your fields, take time to line them up. Select multiple fields by holding Shift and clicking each one, then use the alignment tools in the toolbar to space them evenly or snap them to a grid. Acrobat can align fields to the left, center, or right, and distribute them with equal spacing.

If a field is in the wrong spot, click and drag it to move it. If it's the wrong size, click and drag the corner handles. Labels should sit close to their fields so it's clear what each one is for. If your PDF doesn't have printed labels, you may want to add text boxes (not form fields) to label each field — use the Text tool from the toolbar for that.

Preview the form and test it before sharing

Click the Preview button in the toolbar to see what the form looks like to someone filling it out. In preview mode, you can click fields, type text, and check boxes to make sure everything works. Try filling in a few fields to catch any problems: fields that are too small, labels that don't line up, or options that are hard to read.

If you find something wrong, click the Edit button to go back and fix it. Common issues are fields placed too close together (so they're hard to click), dropdown lists with options that are cut off, or required fields that don't have clear labels. Test on both Windows and Mac if your form will be used on both, because some fonts and spacing can look different.

Save and share your fillable PDF

When you're happy with the form, save it as a PDF. Go to File > Save As, choose PDF as the format, and pick a location. The file is now ready to share. You can email it, upload it to a website, or share a link — people can open it in Adobe Reader (free), a web browser, or any PDF viewer and fill it out.

When someone fills out your form and saves it, their answers are stored in the PDF file itself. They can email the filled-out form back to you, and you can open it in Acrobat to see what they entered. If you want to collect responses from many people, you can also set up the form to submit data to a web server, but that requires more setup in Acrobat's form properties.

Frequently Asked Questions

Can I create a fillable PDF from a Word document or image?

Yes. Open the Word file or image in Acrobat first — you can drag and drop a file into Acrobat, or use File > Open. Acrobat will convert it to PDF. Then use Prepare Form to detect fields, or add them manually. If the original file has a lot of formatting or images, the PDF may not look exactly the same, so check it before you add form fields.

What's the difference between a text field and a signature field?

A text field is for typed answers — names, dates, numbers, anything someone can type on a keyboard. A signature field is specifically for digital signatures, where someone draws or uploads their signature. Use signature fields only where you need a legal signature; use text fields for everything else.

Can people fill out my form on a phone or tablet?

Yes. Adobe Reader and most web browsers can open and fill out PDFs on mobile devices. The form will adapt to the screen size, though very small fields may be hard to tap. Test your form on a phone before you share it widely, and make sure fields are large enough to click easily on a small screen.

What happens if I want to change the form after I've shared it?

Open the PDF in Acrobat, click Edit, make your changes, and save. Anyone who downloads the updated version will see the new fields. People who already filled out the old version will still have their answers in their copy — the changes don't affect files they've already saved.

Do I need to do anything special so people can fill it out in Reader?

No. As long as you save the file as a PDF from Acrobat, it will open and be fillable in Reader automatically. Acrobat embeds the form information in the PDF, so Reader knows how to display and use the fields. You don't need to change any settings or export it differently.