Annotate images in TextEdit on Mac
When you add an image to your document, you can use Markup to write or draw on the image, rotate or crop it, or add shapes, text or a signature to it within TextEdit.
In the TextEdit app
on your Mac, move your pointer over an image, click the Markup pop-up menu 
, then choose Markup.If you don’t see the pop-up menu, you may need to enable Markup. Choose Apple menu
in the sidebar, click Extensions 
on the right (you may need to scroll down), click Actions, then select Markup.Use the tools in the toolbar to mark up the image (or use the Touch Bar).
Tool
Description
Sketch
Sketch a shape using a single stroke.
If your drawing is recognised 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:
Zoom
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.
Highlight Selection
Highlight selected text.
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, click the Sign tool, click Create Signature if shown, then click how you want to create your signature:
Using your trackpad: Click the text when asked, sign your name on the trackpad using your finger, press any key when you’ve finished, 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: 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.
Using your iPhone or iPad: Click Select Device to choose a device (if more than one is available). On your device, use your finger or Apple Pencil (on iPad) to sign your name. When you’re finished, tap Done. If you don’t like the results, tap Clear, then try again.
If you use iCloud Drive, your signatures are available on your other Mac computers that have iCloud Drive turned on.
To delete a signature, move the pointer over it, then click
(to the right of the signature). The signature is no longer available to use in any app where you can add a signature.Shape Style
Change the thickness and type of lines used in a shape, and add a shadow.
Border Colour
Change the colour of the lines used in a shape.
Fill Colour
Change the colour that’s used inside a shape.
Text Style
Change the font or the font style and colour.
Rotate Left
or Rotate Right 
Click
to rotate an item to the left. Continue clicking to keep rotating.To rotate an item to the right, press and hold the Option key, then click
until you’ve finished rotating the item.Crop
Hide part of an image or document. Drag the white corner handles until just the area you want to keep is shown within the frame’s border. You can also drag the frame to reposition it. When you’re ready, click Crop.
Image Description
Enter, view or edit a description of an image. (The tool is highlighted when an image has a description.)
Image descriptions can be read by screen readers and are useful for anyone who has difficulty seeing images online. For example, if you use VoiceOver, the built-in screen reader on Mac, you can press the VoiceOver command VO-Shift-L to hear a description of the image in the VoiceOver cursor.
Annotate
(Continuity Markup)Annotate an item by sketching or drawing on it using your nearby iPhone
Note: If you want to use your nearby iPhone or iPad to sign or annotate items, make sure it meets Continuity system requirements. See the Apple Support article System requirements for Continuity on Mac, iPhone, iPad and Apple Watch.
Click Done.
