This post helps to add a text box to PDF using a free software and an online tool. You can adjust the size of text box, text style, etc.

This post helps you add watermark to PDF in Windows 11/10 computer using free tools. You can add text watermark and image watermark to PDF.

Some of the best Adobe Acrobat alternatives we really like with a host of professional tools include Nitro PDF Pro, EaseUS, ...

In other words, Adobe Reader won't let you add text. What you need is a program that's a little more accommodating, PDF-wise. Try Foxit Reader 4.3, which allows you to add text to any PDF.

Need to add text to a PDF that doesn't support editing? No problem -- and no extra software required.