To convert handwritten notes into a PDF file, there are several methods you can use depending on the device and application you are using. If you are using Microsoft OneNote, you can open the OneNote app, load the notebook containing the page you want to convert, and click File in the menu bar. Then, click Save as PDF in the dropdown menu, and the Save As window will appear. You can name your file, choose the location to save it, and click Save.
If you have an iPhone, you can use the Notes app to convert your notes to a PDF. Open the Notes app and select the note you want to convert. Tap on the three dots icon Export, and then choose PDF. Choose a location and name for the file, and it will be converted to PDF. Another way to convert notes to a PDF on an iPhone is by using the Markup tool. Open the note you want to convert, tap on the Markup icon (usually a marker tip inside a circle icon), and then tap Done. After adding any marks, tap Save File To, choose a location and name for the file, and it will be converted to PDF.