How to Crop a PDF on Mac: Crop Pages or Images

The crucial difference is what you are selecting. Crop changes the visible boundary of a PDF page. Crop Image trims one editable picture object without changing the page boundary. Preview can handle basic page cropping, but it does not directly crop a picture embedded as a separate PDF object.

Part 1. Which PDF Crop Method Should You Use on Mac?

If you need repeatable controls for both pages and pictures, UPDF's PDF editor keeps the two jobs in the same application without treating them as the same operation.

Part 2: How to Crop a PDF on Mac with UPDF

The Best Tool to Crop PDF on Mac

Most of the solutions you will find when looking for a way to crop your PDF document are premium tools that are often quite expensive. The cost for these tools may not be justified if the changes you intend to make to the document are minor. Fortunately, there is a revolutionary new cost-effective PDF editing tool that has all the features you would find on these costly programs available to you.

This new product is UPDF for Mac, a simple but highly effective PDF editor that can be used to crop a PDF document in various ways. It has numerous tools and features that make it an ideal way to create, manage and edit PDF documents.

These features include the following:

• You can use it to edit the text on the document in a variety of ways. You can remove or add text to the PDF or you can change the font style, color, and size of the text as desired.
• You also have the option to change the images on the document. You can add and remove the images from PDF or even crop, rotate or move them to the desired location.
• It also gives you the option to make changes to the pages on the document. You can extract pages from PDF, reorder and delete them or even add new pages to the existing document.
• It is also one of the most powerful ways to collaborate on a PDF document thanks to its numerous annotation tools. You can use them to highlight, underline and strikethrough text or even add comments, shapes, and textboxes to the document.

Now, let's look at the steps to crop PDF pages on Mac.

1. Download UPDF and open it.

2. Select the PDF file.
3. Navigate to the 'Crop' mode in Tools, and drag the border of the page to crop it. 

4. Alternatively, you can click on the icon shown in the screenshot below to manually customize the cropping size of the page.

5. Apply the changes to crop the PDF image. In this step, UPDF provides page range selection for applying changes.

Part 3. How to Crop the Image in a PDF on Mac

If what you want to crop is the image included in a PDF, then follow the steps below:

1. Open UPDF and select the PDF file containing the image you wish to crop.
2. Navigate to the 'Edit' mode in Tools, and click on the image to select it.
3. Choose the 'Crop Image' option to adjust the image boundaries as needed. Except for cropping, UPDF also provides options to rotate, extract, and replace images.

4. Alternatively, you can also manually input the width and height to customize the cropping size.

For other object-level changes, see how to edit text and images in a PDF.

Part 4: How to Crop a PDF on Mac with Preview

Cropping images in PDF files on a Mac can be easily done using Preview. Here's how:

1. Double-click the PDF file. It should open in Preview by default. If it doesn't, right-click the file, choose 'Open With', and select 'Preview'.
2. Click on the 'Show Markup Toolbar' button (it resembles a pencil tip) in the toolbar. Then, click on the 'Rectangular Selection' tool.

3. Click and drag to draw a rectangle over the part of the PDF you want to keep. Be precise, as everything outside this rectangle will be cropped out.
4. After making the selection, go to the menu bar, click on 'Tools', and then choose 'Crop' (or simply press Command-K). This action crops the PDF to your selected area.
5. You can save the cropped PDF by clicking 'File' and then 'Save'. 

Part 5. How to Crop PDF Pages or Pictures with Adobe Acrobat on Mac

Cropping PDF images on a Mac can also be accomplished using Adobe Acrobat. Here are the steps:

1. Open your PDF in Adobe Acrobat.
2. Select the "Edit PDF" tool to enable image editing features.
3. Click on the image you want to crop, and select the "Crop" tool.

4. Drag the cursor to adjust the crop area.
5. Save your document to apply the changes.
6. If you are going to crop the PDF pages, then simply choose "Crop Pages" option, select the area that you want to keep after the cropping.
7. Double-click the page to customize the settings. Once done, click "OK" to apply the changes, and then save the cropped PDF.

Part 6. Cropping vs. Redaction vs. Splitting a PDF

These operations solve different problems. Choosing the wrong one can leave data recoverable or produce the wrong page structure.

UPDF provides Split a Page as a separate option in the Mac crop workspace. Use that option—not an ordinary crop—when a scanned book spread needs to become two individual PDF pages. For document-level division, use a dedicated split PDF workflow.

When the content outside a crop box is sensitive, use true PDF redaction for the confidential material. If the goal is specifically to prevent someone from restoring an otherwise acceptable page crop, UPDF's Save as Flatten > Cropped Pages option is designed to flatten cropped-page content. Keep an unflattened archival copy because flattening limits later recovery and editing.

FAQs

Conclusion

To crop page margins or apply one crop across several pages, use Tools > Crop in UPDF. To trim only a selectable picture, use Tools > Edit > Crop Image. Preview is suitable for a quick page crop, while Acrobat covers both page and object workflows for users already working in Adobe's editor.

Most importantly, do not confuse a cleaner page boundary with permanent data removal. Save a working copy, inspect every affected page, and redact or flatten content when the hidden area must not be recoverable.

If you want precise page controls and editable-image cropping in one Mac application, download UPDF and try the appropriate workflow on a copy of your PDF.