catScan

Write on PDF

Add text, images, shapes, highlights and drawings.

Processed on your device

  1. 1Choose the files
  2. 2Arrange and adjust
  3. 3Download

You need to sign in to use the tools. It's free.

8 free uses a month · Plus is unlimited

Type directly on a PDF as if it were paper: fill in a printed form, add a note, complete a date or a name. Click where you want to write and choose among 13 fonts, size, color, bold and italic.

How to write on a PDF

  1. Open the PDF: the editor starts with the text tool.

  2. Click where you want to write and type; adjust font, size and color.

  3. Download the PDF with your text.

When it helps

  • You received a form as a PDF and want to fill it in without printing it.

  • You need to add a date, a name or a note to a document.

  • The form is a scan, with no fields to click on.

Why use catScan

  • Private by design

    This tool works inside your browser: the file is processed on your device and is never uploaded or stored.

  • Free to start

    Sign in with Google and get 8 free uses per period, shared with the catScan app. 1 use = 1 downloaded file; if something fails, it doesn't count.

  • Nothing to install

    It works in any modern browser on computer, tablet or phone. To scan paper with your camera, use the Android app.

Frequently asked questions

Can I write on a scanned PDF?

Yes. Text boxes can go anywhere on the page, also on top of scans and photos, so you can complete forms that have no fields.

And if the PDF has fillable fields?

The editor detects them: you can type in the text fields and tick the checkboxes, and the completed form is saved in the PDF.

Can I move or change the text later?

Yes, until you download: drag a text box to move it, or click it to change the words, the font or the color.

Are my files stored?

No. This tool processes the file on your device, inside the browser: it is not uploaded to any server and nothing is stored.