Annotate a PDF in Preview on Mac
You can use the markup tools to provide feedback or write down something you want to remember. The editing tools in the Markup toolbar are ideal for collaborating—use them to suggest changes to a PDF and to respond to suggestions.
In the Preview app
on your Mac, if the Markup toolbar isn’t showing, click the Show Markup Toolbar button 
.Use the tools in the toolbar to mark up the PDF (or use the Touch Bar).
Text Selection
Select text to copy or delete. See Select and copy text in a PDF.
Rectangular Selection
Select a rectangular area in an image to copy or delete.
Sketch
Sketch a shape using a single stroke.
If your drawing is recognized as a standard shape, it’s replaced by that shape; to use your drawing instead, choose it from the palette that’s shown.
Draw
Draw a shape using a single stroke. Press your finger more firmly on the trackpad to draw with a heavier, darker line.
This tool appears only on computers with a Force Touch trackpad.
Shapes
Click a shape, then drag it where you want. To resize the shape, use the blue handles. If it has green handles, use them to alter the shape.
You can zoom and highlight shapes using these tools:
Loupe
: Drag the loupe to the area you want to magnify. To increase or decrease the magnification, drag the green handle; drag the blue handle to change the loupe size.Highlight
: Drag the highlight where you want. To resize it, use the blue handles.
Text
Type your text, then drag the text box where you want.
Sign
If signatures are listed, click one, then drag it where you want. To resize it, use the blue handles.
To create a new signature:
Using your trackpad: Click Trackpad, click the text as prompted, sign your name on the trackpad using your finger, then click Done. If you don’t like the results, click Clear, then try again.
If your trackpad supports it, press your finger more firmly on the trackpad to sign with a heavier, darker line.
Using your computer’s built-in camera: Click Camera. Hold your signature (on white paper) facing the camera so that your signature is level with the blue line in the window. When your signature appears in the window, click Done. If you don’t like the results, click Clear, then try again.
See Fill out a PDF form.
Note
Type your text. To change the note color, Control-click the note, then choose a color. To move the note to a different location, drag it.
Shape Style
Change the thickness and type of lines used in a shape, and add a shadow.
Border Color
Change the color of the lines used in a shape.
Fill Color
Change the color that’s used inside a shape.
Text Style
Change the font or the font style and color.
When you’re finished, click Done.