To merge PDFs, add the files to a PDF editor, arrange the pages in the order you want, and save the combined document. To split one, choose the page boundaries or a rule such as page count or bookmarks, then save the resulting files. On a Mac, Preview can combine whole PDFs or selected pages; Acrobat desktop offers more split rules, while Acrobat on the web saves split results to Adobe cloud storage.
Choose a method that fits your device and workflow
| Option | Best suited to | Output and control |
|---|---|---|
| Acrobat desktop | Combining files and splitting by defined rules | Preview and rearrange pages before combining; split by page count, file size, or top-level bookmarks. You choose an output folder for split files. Adobe’s combine instructions and split tutorial |
| Preview on Mac | Combining complete PDFs or selected pages | Drag page thumbnails into another PDF and reorder them in the sidebar. Preview saves edits automatically, so duplicate files first if you need to preserve the originals. Apple’s Preview guide |
| Acrobat on the web | Splitting a PDF by chosen page boundaries | Select where to divide the uploaded PDF; the resulting PDFs are saved to Adobe cloud storage. Adobe’s web split instructions |
Choose based on whether you need to reorder individual pages, split by a rule rather than manually selected boundaries, or keep the result in a particular location. The cited instructions do not establish comparative pricing, processing speed, upload retention, or a privacy ranking, so those are not compared here.
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Merge PDFs in Acrobat desktop
Acrobat can combine PDFs and other file types. Its thumbnail preview lets you check page order and remove pages before creating the combined file. Follow Adobe’s Combine Files instructions:
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- Add the PDFs or other files you want to include.
- Review the thumbnail preview. Drag files or pages into the desired order and remove any pages you do not want.
- Select Combine.
- Save the resulting PDF.
Check the preview before combining: a correctly merged file can still be inconvenient if the pages are in the wrong order or include material you meant to leave out.
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Merge PDFs or selected pages in Preview on Mac
Preview can combine entire PDFs or just chosen pages. Since edits are saved automatically, Apple recommends duplicating the PDFs first if you want to keep the originals unchanged. See Apple’s Preview guide.
- Open the PDFs in Preview.
- Choose View > Thumbnails to show page thumbnails in the sidebar.
- In the source PDF, select the page thumbnails to copy. To combine a complete PDF, select all its pages.
- Drag the selected thumbnails into the destination PDF’s sidebar.
- Drag thumbnails in the sidebar to put the pages in the right order.
Split a PDF in Acrobat desktop
Acrobat desktop supports three split rules: a number of pages per file, a maximum file size, or top-level bookmarks. Its tutorial also describes choosing an output folder and file labels. The best rule depends on how you plan to use the pieces: page count makes evenly sized page groups, file size targets a size limit, and bookmarks can divide a document along its main sections. See Adobe’s split tutorial.
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- Open the PDF in Acrobat and open its split tool.
- Choose the split rule: page count, file size, or top-level bookmarks.
- Set the rule’s options and review the output folder and file labels.
- Run the split and check the resulting PDFs.
Bookmark-based splitting depends on the document having suitable top-level bookmarks. If it does not, use a page-count or file-size rule instead.
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Acrobat on the web lets you upload a PDF and choose where to divide it. Adobe says the split files are saved to Adobe cloud storage. Use this workflow when you want to specify page boundaries rather than split by a desktop rule; account for the cloud destination when deciding whether it suits your file. Follow Adobe’s web instructions:
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- Upload the PDF to Adobe’s online split tool.
- Select the page boundaries where you want the PDF divided.
- Continue to create the split files.
- Save or access the resulting PDFs from Adobe cloud storage.
Make a new PDF from the middle of a document
If you need to “cut out the middle section” as a separate document, split the original at the page before that section and at its final page. The middle pages become their own PDF, while the pages before and after remain outside that selection. For a different result—removing the middle pages while keeping the beginning and end together—create a new PDF from the pages you want to retain, or use Acrobat’s page preview to remove the unwanted pages before saving. Verify the page boundaries in the preview before creating the output.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the available instructions do not establish
The cited documentation covers Acrobat and Preview workflows, but it does not establish which merge or split features are currently built into Windows. It also does not establish web-service file retention or deletion terms. If you are deciding whether to upload a sensitive document, check the service’s current terms and controls directly before proceeding.
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