How to fill out a PDF form online (no printing, no scanning)

PDF forms come in two types: interactive forms with clickable fields (AcroForm fields, in the technical jargon), and flat PDFs that are effectively just images of a form. For interactive forms, filling in online is straightforward. For flat ones, you need a different approach. Here's how to handle both.

First: check whether the form has interactive fields

Drag the PDF onto a Chrome or Firefox tab and click where you'd expect to type an answer. If a cursor appears and you can type, the fields are interactive. If nothing happens, the form is flat — you'll need an annotation tool rather than the native field behaviour.

Method 1: fill in Chrome or Firefox (interactive forms)

Both browsers have built-in PDF viewers that handle interactive AcroForm fields. Open the PDF, click the fields, type your answers. Checkboxes respond to a single click. Dropdown fields open a selector. When you've filled everything in, use Ctrl+P (or Cmd+P on Mac) and choose 'Save as PDF' to create a filled copy that you can email or keep on file.

• Drag your PDF onto a Chrome or Firefox tab
• Click each field and type your answer
• Click checkboxes to toggle them on or off
• Press Ctrl+P (Windows) or Cmd+P (Mac) and save as PDF
• The filled PDF now has your answers permanently written into it

Method 2: Adobe Acrobat Reader (interactive and flat forms)

The free version of Adobe Acrobat Reader handles interactive forms natively. For flat PDFs, the Fill & Sign tool (Tools > Fill & Sign) lets you click anywhere on the document and type text annotations. It doesn't create proper form fields, but it positions text visually in the right places. Save a copy before closing.

Method 3: e-sign platform (forms that also need a signature)

If the form also requires a signature at the end — consent forms, applications, contracts — an e-signature platform handles both filling and signing in one flow. Upload the form, fill the fields, add your signature. If you're sending it to someone else to complete, they receive a link and fill it in their browser without creating an account.

What if the form is locked?

Some PDFs are locked to prevent editing — common with official government forms, regulated applications, and forms from financial institutions. If the restriction is deliberate, fill and print as intended. Don't attempt to remove protection from forms you don't own. For your own protected PDFs, Adobe Acrobat Pro can manage permissions.

Save before you close

This sounds obvious but it catches people out regularly. Once you close an interactive PDF in a browser without saving, the filled data is gone — the browser viewer doesn't preserve form state by default. Either use the print-to-PDF trick before closing, or download a named copy from your e-sign platform if that's what you're using.