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Without diving deep into the topic, PDF merge on Mac seems easy. Whether you’re using Catalina, Big Sur, or older macOS versions, Preview covers the feature on most of them. In the end, you can also use web services for online merging. Well, you wouldn’t be here if it were that easy, right?

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Combine PDFs into one

• Merge MP3 Files Using CAT Command On Mac OS X. Are you looking for a super quick way to merge multiple MP3 files into one big MP3 file? This can be done using the CAT (concatenate) command in Mac OS X. I mean, sure, you could load all the MP3’s back-to-back into a track in GarageBand and then export to a new MP3 file, but.
• How to Combine PDF Files on Mac with PDFelement Pro. Run the PDF Combiner on Mac.

Select up to 20 PDF files and images from your computer or drag them to the drop area. Drag-and-drop file blocks to change the order. When you are ready to proceed, click COMBINE button.

Get a set of top apps to merge PDF files, add and rearrange PDF pages on your Mac. Best utilities in one pack, give it a go!

To combine PDF files while saving your edits might be a huge problem. Preview doesn’t cover flattening and makes your system slow down if you merge large files. These and other issues might force you to search for better options. Let’s explore all the ways to combine PDFs on Mac to cover your particular scenario.

How to merge PDFs in Preview

Preview is Apple’s native image and PDF viewer built for macOS. The app is primarily used to fill out PDF forms, add signatures as well as combine PDF files or specific pages across PDFs. Here’s the basic guide on how to use Preview for PDF management.

To merge PDFs in Preview:

1. Open PDF 1 in the Preview app
2. Make sure the thumbnails are visible: View > Thumbnails
3. Select a page thumbnail after which you want to insert a new file
4. Go to Edit > Insert > Page from File > Open to insert PDF 2
5. To save the changes, click on File > Export as PDF.

To insert specific pages into PDFs:

1. Open both PDFs you want to combine in Preview
2. Make sure the thumbnails are visible in both documents: View > Thumbnails
3. Press and hold Command, select page thumbnails you want to move to the other file, and let go of Command
4. Drag the thumbnails onto the other PDF file and drop them wherever you want the pages to appear
5. To save the changes, click on File > Export as PDF.

Once you combine PDF files, you can continue editing to reach your desired output:

• Drag a page thumbnail to any location to reorder pages.
• Select a page thumbnail > Tools > Rotate Left/Right to rotate pages.
• To remove a page, select the thumbnail > Edit > Delete.

That’s basically the whole toolkit Preview covers in terms of PDF merge. Unfortunately, even these features can be pretty limited in some situations:

• Loses scripts. This is why using Preview with PDFs that contain forms isn’t the best idea.
• Fails with signatures. Unlike popular PDF editors, Preview doesn’t allow you to upload signatures in case you want to add them to a merged file. You can only draw with your touchpad or take a picture with a front camera — which is not always possible.
• Slows down your system if you combine large files.

The alternatives are easy to find. And if you’re working with PDFs on a regular basis — expecially large files and extensive edits — you should probably get a reliable third-party PDF editor.

Combine PDF files with PDFpen

So we’ve seen the shortcomings. No judgment, Preview is still a stunning tool to apply basic changes. If all you need is to insert a page from another PDF or merge small files, Apple’s native utility won’t let you down. But if your document contains any scripts, annotations, or custom changes, you will have trouble saving it. This is where PDFpen comes to rescue.

PDFpen is a full-featured PDF editor with OCR support. Its biggest superpower is a rich editing toolkit enabling you to redact sensitive info in PDFs, add signatures, attach notes and comments, etc. Best of all, PDFpen lets you flatten a PDF and merge it with other PDFs, preserving all the changes you’ve made. Here’s a detailed guide.

To merge multiple files with PDFpen:

1. Open two PDF files in PDFpen
2. Make sure the sidebar is visible (View > Show Sidebar)
3. In one of the PDFs, select all thumbnails in the sidebar: Edit > Select all
4. Drag the selected thumbnails onto your other PDF file and drop them wherever you want the pages to appear.

Another way to insert PDF 1 into PDF 2 is to open one of the files, then go to the menu bar and click on File > Insert. PDF 2 will appear after the current page in PDF 1.

To add blank pages or pages from another PDF:

1. Open your PDF in PDFpen
2. Click on Edit > Insert Blank Page (it will appear after your current page)
3. To insert a page from another file, open both, find the thumbnail of a page you want to insert, and drag it onto another PDF.

To flatten a PDF with all changes saved

If you want to flatten a PDF preserving the annotations you’ve added, you can do it via PDFpen’s Print feature: File > Print > PDF > Save as PDF. The saved document will contain all the annotations. Another option is to save your PDF as a .TIFF file, which will basically turn PDF pages into large images.

OCR and searchable PDF: How to merge with Prizmo

Prizmo is a perfect tool for merging physical pages and transforming them into a searchable PDF document. Let’s say you have printed pages of your favorite short stories, covered with dust. Or, you’re collecting paper receipts and it would really help if you could have them in one digital document. For those purposes, nothing really matches the capabilities of Prizmo.

Here’s how you combine PDFs into one using Prizmo:

1. Open the app and select New Document.
2. To upload a PDF or image, click on Import from Scanner or Camera.
3. Once your first file is scanned, you can add a new one via the plus button in the upper left corner.
4. Make the necessary corrections and changes.
5. Click on the Export button > PDF > Save.

That’s it, no complications. The most exciting part of the Prizmo experience is whatever happens between you scan your files and run PDF merge:

• Dedicated modes. Depending on the input, you can switch between three different modes: Text (OCR on texts), Business Card (scanning contact info), Image (image processing without OCR).

• Image correction. If an image you scan has some imperfections, Prizmo enables you to select the area and straighten it. This will fix lighting and centering problems, magically. So if you have any doubts as to the quality of your photography, let Prizmo do the job.

• Fixing the text. The app sees specific parts of the text as “regions,” which you can adjust manually. You can create, merge or separate regions across your PDFs. Even if a scanned document doesn’t look perfect, Prizmo makes it meet your needs.

• Page curvature fixes. This comes very useful for scanning book pages or magazines. Prizmo straightens the curves that appear near the binding to avoid text and image distortions.

This editing toolkit gives you the freedom of not only merging PDFs but also changing the look of texts and images on PDFs. Once you apply the changes, you can export merged files as searchable PDFs as well as enable access across devices via iCloud sync.

PDFpen and Prizmo both make a solid alternative to Apple’s Preview. However, you’ll probably use them for different purposes: PDFpen — for flattening PDFs, and Prizmo — for image OCR and searchable PDF export. The great news is thatt is not a problem at all. Both apps are a part of Setapp subscription, which means you can use them + 170 other Mac uilities for $9.99 per month. By the way, PDFpen and Prizmo are not the only Setapp citizens that specialize in PDFs. You’ll also have the chance to experiment with PDF Search and PDF Squeezer.

Hopefully, this article helped you solve your “how to combine PDF files Mac” problem, beautifully. And remember, you can change just about anything if you own the right tools — even PDFs!

Meantime, prepare for all the awesome things you can do with Setapp.

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