Annotate an image in Preview on Mac
You can use the editing tools in the Markup toolbar to mark up an image file, providing feedback or pointing out something you want to remember.
If the image is on a page in a PDF file and you want to comment on only the image, you can extract the image as a separate image file. See Extract a PDF page as an image for instructions.
If you only want to comment on part of an image that you’ve opened in Preview, you can select part of it, choose Edit > Copy to copy just that part, then choose File > New from Clipboard to create a new file. You can also crop the image to remove areas that you don’t want.
Note: If you annotate an image file, you can’t edit, move, or delete the annotations after you save the image. If you think you’ll need to change annotations later, you can convert the image file to a PDF file, then add annotations to the PDF.
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 image (or use the Touch Bar).
Use any of the following shape tools to select an area in an image and then crop, copy, or delete:
Remove the background from an image.
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 a shape using a single stroke. Press your finger more firmly on the trackpad to draw with a heavier, darker line.
Note: Unlike the Sketch tool, the Draw tool doesn’t recognize standard shapes.
This tool appears only on computers with a Force Touch trackpad.
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.
See Rotate and modify shapes added to a PDF for more options.
Type your text, then drag the text box where you want.
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.
Change values for an image’s exposure, contrast, saturation, tint, and more.
To have the values automatically adjusted, click Auto Levels. To return to the original values, click Reset All.
Change an image’s size and resolution.
Change the thickness and type of lines used in a shape, and add a shadow.
Change the color of the lines used in a shape.
Change the color that’s used inside a shape.
Change the font or the font style and color.