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How to Annotate a PDF in Notes on iPhone
To annotate a PDF in Notes on iPhone, import the file via the Share menu, tap the Handwriting Tools button, and draw with the pen or marker tools.

You can annotate a PDF document on your iPhone using the Notes app by attaching the file, opening the Handwriting Tools, and drawing with your finger in the Markup toolbar [Work with PDFs in Notes on iPhone - Apple Support, Draw and handwrite with Markup on iPhone - Apple Support].
Importing a PDF into a note
To bring a PDF into the Notes app from an application such as Files or Mail, you can drag the file directly into a note [Work with PDFs in Notes on iPhone - Apple Support]. Alternatively, touch and hold the file, tap the Share button, tap Notes, choose a note, and then tap Save [Work with PDFs in Notes on iPhone - Apple Support]. As a practical suggestion, verify that you have chosen the correct destination note before saving so you can easily locate your document later.
Accessing the Handwriting Tools
For a PDF displayed in a small preview size, tap the PDF to open it, then tap the Handwriting Tools button [Work with PDFs in Notes on iPhone - Apple Support]. If you have medium and large preview sizes, tap the Handwriting Tools button [Work with PDFs in Notes on iPhone - Apple Support].
If you do not see the Markup toolbar in a supported app, tap the Markup button or Markup [Draw and handwrite with Markup on iPhone - Apple Support]. If the toolbar is minimized, tap its minimized version [Draw and handwrite with Markup on iPhone - Apple Support].
Drawing and erasing annotations
In the Markup toolbar, you can tap the pen, marker, or pencil tool, and then draw or handwrite with your finger [Draw and handwrite with Markup on iPhone - Apple Support]. As a practical suggestion, try resting your device on a stable surface while making your annotations.
You can also tap the eraser tool in the Markup toolbar [Draw and handwrite with Markup on iPhone - Apple Support]. To erase pixels, scrub over what you want to remove using your finger [Draw and handwrite with Markup on iPhone - Apple Support]. To erase a group of strokes, tap the eraser tool, tap Object Eraser, and then touch the grouped strokes with your finger [Draw and handwrite with Markup on iPhone - Apple Support].
