A form asks for your name, your email, and a date. Somehow that turns into hunting for an edit button, trying a converter, or giving up and printing it. Usually, one of these four things is getting in the way.
1. The form has no fillable fields
Some PDFs have real form fields you can click into. Many don't. The boxes and lines are just drawn on the page, so the form looks fillable but isn't.
Fix: Type on top of the page instead. See how to fill out a non-fillable PDF.
2. The PDF is a scan
A scanned PDF is essentially a photo of paper. There's no text or field to click into, just an image.
Fix: You don't need to convert it or run OCR. See how to type on a scanned PDF.
3. You're looking at a preview, not an editor
Email previews and many phone or browser viewers are made for reading. Even if the form is fillable, they may not let you type in it.
Fix: Save the file first, then open it in a tool that can add text. See how to fill out a PDF someone emailed you.
4. Your editor makes you switch tools for every answer
Sometimes you can type, but it's tedious: select the text tool, draw a box, type, and repeat for every blank, with another tool for every checkbox.
Fix: Use an editor where clicking the page is enough. See how to type anywhere on a PDF without switching tools.
One way around all four
Type PDF handles each of these the same way. Open the PDF, click where your answer goes, and type, then click the next blank. It doesn't matter whether the form has fields or is a scan, and there's no tool to reselect between answers.
It adds content over the page rather than editing the original text. If you need to rewrite what's already in the document or build a fillable form for others, you'll need a different kind of tool.