In apps including Notes, Mail, and iBooks, you can annotate images, notes, PDFs, screenshots, and more with built-in drawing tools. In some apps, you can also add text, speech bubbles and other shapes, and signatures.
Mark it up. Tap 
, then use your finger to draw.
To mark up a screenshot right after you take it, tap the thumbnail that appears for a few moments in the bottom-left corner of the screen. (To share a screenshot after you mark it up, tap 
.)
Choose a markup tool. Tap the pencil, marker, or pen tool. Switch to the eraser—or tap 
—if you make a mistake.
Move your drawings. Tap 
, drag around one or more drawings to make a selection, lift your finger, then drag your selection to a new location.
View more color choices. Tap the current color to view a color palette. Swipe the palette left or right to see more colors. Or, hold iPhone in landscape orientation.
Zoom in. Pinch open so you can draw the details, then pinch closed to zoom back out. To navigate when you’re zoomed in, drag two fingers.
Add text. Tap 
, then tap Text. Tap the text box, tap Edit, then type your text. To change the font or layout, tap 
. To move the text box, drag it.
Add your signature. Tap , then tap Signature.
Add a shape. Tap , then tap a shape. To move the shape, drag it. To resize it, drag any blue dot.
To fill the shape with color or change the line thickness, tap 
. To adjust the form of a shape that has a green dot, drag the dot. To delete or duplicate a shape, tap it then choose an option.
Magnify a portion of the screen. Tap , then tap Magnifier. To change the magnification level, drag the green dot. To change the size of the magnifier, drag the blue dot.
