How to Type on a Scanned PDF and Fill It Out Online

A scanned PDF is a picture of a paper page. You can’t click into it, and you can’t select its words. But you can still fill it out. You place text boxes on top of the blanks and type your answers. You do not need OCR or any special software to do that.

This guide shows how, and explains what you can and can’t do with a scan.

Why you can’t type into a scanned PDF

A PDF made on a computer often has real form fields. You click a box, and a cursor appears.

A scanned PDF has none of that. When a page goes through a scanner or a phone camera, it becomes one flat image. The lines, boxes, and printed words are just dots of ink in a picture. There is nothing to click into.

Filling a scan vs. editing a scan

These sound alike, but they are different jobs:

Filling means adding your answers on top of the page: names, dates, ticks, a signature. This is what most forms need. You do not need OCR for it.
Editing means changing the words that are already printed on the scan. For that, you need OCR, which is software that turns the picture of text into real text.

AnyPDFfiller fills scanned PDFs. It does not turn a scan into editable text. If you need to change the printed wording itself, you need an OCR tool instead.

How to fill a scanned PDF, step by step

1. Upload the scan

Open the editor and upload your scanned PDF. It opens in your browser, so there is nothing to install.

2. Let AI find the blanks

Click Form Field Detect in the top bar. AI field detection looks at the page as a picture. That is why it works on scans, where there is no text to read. It adds a text box on each blank it finds, with a short hint inside. You type over the hints.

Two things to know:

It works on one page at a time. Run it again on each page.
It replaces any fields already on that page, so run it before you add anything by hand.

Free accounts can run it 5 times a week.

3. Add or fix text boxes by hand

The AI can miss a blank or put a box in the wrong spot. To add text yourself, click Add Text Field, or just double-click the spot on the page. Drag a box to move it, and pull its edges to resize it.

4. Tick the boxes

For checkboxes, use Check or X Mark from the toolbar and click the box. See how to add a check mark in a PDF.

5. Sign it

If the form needs a signature, create your signature and place it on the signature line. No printing or rescanning needed.

6. Download

Click Download. You get a new PDF with your answers on the page. Free downloads include a watermark. Premium removes it.

Tips for scanned forms

Scans are rarely perfect. These tips help your answers look neat:

Crooked scan? Your typed text stays level, even if the page is tilted. Use one short box per line instead of one long box that runs across several lines. Each box can then sit right on its own line.
Match the size. Set the Font size so your text looks about as big as the printed words.
Old or typewriter-style forms. The Courier font looks like a typewriter and often blends in well.
Blurry or dark scan? If you can’t read the form, rescan it. Scan in good light, flat, and at a normal size. A clearer page is easier for both you and the AI.
Many pages? Work page by page. Fields stay on the page where you placed them.