How to Merge, Split & Rotate PDF Files

Merge, split and rotate: what is the difference?

How to merge PDF files

Use merging when the final result should contain pages from two or more PDFs in one document. Before combining anything, decide the correct file order. A technically successful merge can still be confusing if the pages are arranged incorrectly.

1. Gather the PDF files you want to combine.
2. Open each important source file and confirm it is the correct version.
3. Decide the required document order.
4. Use the merge tool to combine the files.
5. Open the resulting PDF and check the beginning, transitions between source files and final page.
6. Save the merged result with a clear filename while keeping the originals if they may be needed later.

How to split or extract PDF pages

Splitting is useful when a PDF contains more material than you need. For example, you may need only a particular section of a report, a small group of pages from a larger document, or separate files for different parts of a scan.

1. Open the source PDF and note the page numbers you actually need.
2. Check whether the PDF's displayed page numbers match any numbers printed inside the document.
3. Select the required page or page range in the split tool.
4. Create the new PDF.
5. Open it and verify that the first and last selected pages are correct and nothing essential is missing.

How to rotate PDF pages

Rotation is commonly needed after scanning documents or combining files created in different orientations. The important distinction is between rotating the page itself and merely changing how a particular PDF viewer displays it temporarily.

1. Identify the pages that are sideways or upside down.
2. Select the appropriate page or pages.
3. Rotate them in the required direction.
4. Save the corrected PDF as a new file.
5. Reopen it to confirm the orientation was saved as expected.

A sensible PDF workflow

When a document needs several operations, think about the final page sequence before you begin. There is no universal order for every job, but the following approach is easy to reason about:

1. Inspect: understand which files and pages belong in the final document.
2. Extract if necessary: remove unwanted material or create the page groups you need.
3. Correct orientation: rotate pages that would otherwise be difficult to read.
4. Combine: merge the prepared files into the required order.
5. Verify: inspect the finished PDF rather than assuming the operation worked exactly as intended.

Common PDF mistakes to avoid

• Merging files without checking their order first.
• Deleting the original documents before verifying the result.
• Confusing printed page numbers with the PDF viewer's page positions.
• Rotating every page when only one or two pages are incorrectly oriented.
• Assuming a generated file is correct without reopening it.
• Using an online utility for material that your organisation's security or confidentiality rules prohibit you from uploading or processing that way.

What about sensitive documents?

Before processing confidential, regulated or commercially sensitive material, consider the rules that apply to that document. A convenient browser tool does not override workplace policies, contractual obligations or legal requirements. If a document must remain within an approved system, use the approved workflow.