Method 3: Crop and Resize Images on Mac with Preview Changing the number of pixels a photo has isn't the only way to resize an image. Cropping is also a great way to change the size of a photo because it also allows you to remove parts of an image you don't like. Here's how you can crop a photo in Mac's Preview app Step 1.
Preview User Guide
You can crop a page to hide content, or rotate it to change its orientation.
Crop a PDF
To crop a PDF, you first select the area you want to keep, and then discard the rest. If you want to view the dimensions of the content you’re selecting, choose Tools > Show Inspector, then click the Crop Inspector button and choose a unit of measurement that’s displayed in the Crop Inspector window.
In the Preview app on your Mac, if the Markup toolbar isn’t showing, click the Show Markup Toolbar button , then click the Rectangular Selection button .
Select the portion of the page you want to keep.
Click the Crop button in the Markup toolbar (or use the Touch Bar).
Note: To undo the crop immediately, choose Edit > Undo Crop. To undo the crop later, return to a version before the crop. Choose File > Revert To > Browse All Versions, then browse the versions to restore the one you want.
Rotate a PDF
In the Preview app on your Mac, open the PDF you want to change.
Do one of the following:
Rotate one page: Click (or use the Touch Bar) to rotate the page to the left. Continue clicking to keep rotating.
To rotate a page to the right, press and hold the Option key, then click until you’re done rotating the page .
Rotate several pages at once: Choose View > Thumbnails or View > Contact Sheet, select the pages to rotate, then click to rotate the pages to the left.
To rotate the selected pages to the right, hold the Option key, then click until you’re done rotating the pages.
Photos comes with every Mac and provides powerful, easy-to-use editing tools along with photo organization and sharing features. Use Photos to perfect your images, and don't be afraid to explore all of the tools — if you don't like a change you made, you can go back to the original photo any time.
Before you begin
- Update the software on your Mac to make sure that you're using the latest version of macOS.
- To ensure that all of your photos are available for editing, turn on iCloud Photos on your Mac and your other devices.
iCloud Photos keeps your photos organized and up to date everywhere that you use it. So any edits that you make on your Mac appear on your other devices too.
Get started
To open a photo in Edit view, double-click a photo in your library, then click Edit in the toolbar. You can also select a photo and pressCommand-Return to open a photo in Edit view. Click a tab in the middle of the toolbar to select from the three groups of editing tools: Adjust, Filters, and Crop.
The toolbar also has buttons for editing with extensions and quickly rotating or enhancing your photo.
While you edit, you can use the slider on the toolbar's left side to zoom in on your photo for greater detail. When you finish making your adjustments, click Done.
Adjust
Use the powerful tools in Adjust to fine-tune your photo's light, color, sharpness, and more. Use sliders or the Auto button to easily adjust your photo — or dive deeper with detailed controls.
Click the triangle next to each Adjust tool's name to show its controls. Some tools allow even more detailed adjustments; click the triangle next to Options to see everything the tool offers.
You can toggle individual adjustments on and off by clicking the blue circle that appears next to each tool when it's expanded or when hover your pointer over it.
Mac Preview Crop
If you want to apply the adjustments you make from one photo to another, just copy and paste them. Open the photo that has the adjustments that you want, click Edit, and choose Image > Copy Adjustments. Then open the photo you want to apply the edits to, click Edit, and choose Image > Paste Adjustments.
Filters
Image Capture App For Mac
The nine filters in Photos emulate three classic photography styles — vivid, dramatic, and black and white — and are optimized to enhance your image while keeping skin tones natural.
Choose Vivid, Vivid Warm, or Vivid Cool to enhance the vibrancy of your images; Dramatic, Dramatic Warm, or Dramatic Cool to add contrast; or Mono, Silvertone, or Noir for a classic black and white.
Crop
Straighten your photo, improve its composition, or get rid of parts that you don't want.
Drag the selection rectangle by its edges or corners. When you let go of the selection rectangle, your cropped photo appears. Use the numbered dial to the right of your photo to straighten it. As you move the dial, a grid appears on your photo to help you with alignment.
Aspect
Choose from a range of ratios — like square or 5:7 — or leave it as freeform.
Flip
Horizontally flip your photo, or option-click to flip it vertically.
Photos can also automatically straighten and crop your photo — just click the Auto button. Or click Reset to undo all cropping and rotation and restore your photo to its original dimensions.
Edit with third-party apps
You can edit images from your Photos library with third-party apps, such as Photoshop and Pixelmator, right from the Photos app. Select an image, then choose Image > Edit With and choose the editing app that you’d like to use.
When you’re finished editing in the app, save your work or use the Command-S keyboard shortcut. Any edits you make are saved in Photos as a non-destructive change, so you can always revert your image to its original state.
More editing tools
Extensions
Third-party extensions expand your editing options in Photos. You can apply edits from multiple extensions to one photo, or use any combination of extensions plus the editing tools built into Photos. Learn more about editing with third-party extensions.
You can also use the Markup tool in the Extensions menu to add drawings, shapes, and text to your photos.
Rotate
Turn your photo 90 degrees counterclockwise. If you want to rotate the other direction, hold down the Option key.
Enhance
Improve your photo with just one click. Automatically adjust your photo's color, light, and contrast.