How to fill out a PDF form
Updated October 25, 2026
Type answers into any PDF, tick boxes, add dates and sign, even when the form has no fillable fields.
Fillable and non-fillable forms
Some PDF forms have built-in fields you can click and type into. Many others, especially scanned paper forms, are just pictures of a page. PDF One handles both the same way: you place text, checkmarks and signatures exactly where you want them on the page, so any form can be completed without printing it.
Step by step
- Open the form in PDF One.
- Choose Fill & Sign and pick Custom Text. Click on the page where the answer belongs and type.
- Adjust the font size so your text fits the box. Drag the text to line it up with the printed line.
- Use the checkmark stamp for tick boxes and the date stamp for date fields.
- If the form needs a signature, follow the signing guide.
- Zoom in to check every field, then click Save a copy.
Tips for forms that look professional
- Use one font and one size throughout the form so it looks tidy.
- Write dates in the format the form asks for (for example DD/MM/YYYY or MM/DD/YYYY).
- For long answers, use several shorter text boxes, one per printed line, rather than one long line that runs off the page.
- If the form is a crooked phone photo, straighten it first with the scanner so your text lines up.
Your personal details stay with you
Forms are full of sensitive information: addresses, dates of birth, ID numbers, medical and financial details. With an online form filler, all of that passes through someone else's server. In PDF One it is typed into a page that lives only in your browser's memory and is saved straight back to your device.