How to split PDF: Summary of several common methods and steps

Key points of this article

Determine first which pages or files per page you want, and then choose the splitting method, which can save you a lot of detours.
Before splitting, confirm whether the file has an opening password, and plan the split point based on the actual page number of the file rather than the page number in the book.
PDFs containing sensitive content such as contracts and medical records should be processed locally on the desktop first and should not be uploaded to the website at will.
After splitting, check the number of pages, page order, text, pictures and file names one by one, and if any problems are found, return to the original document and split it again.

If you have a 30-page paper collection and only need to hand over pages 5 to 12 to your instructor, or if you want to distribute a contract to different colleagues by chapters, you will encounter the problem of "how to split the PDF". PDF does not allow you to directly delete pages like Word. Many people only search for a list of tools, but it is difficult to find the actual steps to follow.

This article takes a different angle. Instead of listing tools, it organizes several common methods according to the purpose of splitting, and gives steps that can be followed. After reading, you will be able to judge which one you should use, know how to split by page on the desktop, and know what to pay attention to when using online tools or system built-in functions.

The main operations in this article are completed in the PDF editor of the OmniDoc desktop client. Other methods only talk about common methods.

How to split PDF? One sentence conclusion

First think clearly whether you want "which pages" or "one file per page", and then choose a method. In most cases, page splitting on the desktop is more reliable; only when temporarily processing a small number of insensitive files, online tools or system printing functions should be considered.

your situation	Recommended practices	reason
Just a continuous page number	Split by page range on desktop	Page numbers are controllable, and the original document content and layout are retained.
Make each page its own file	Set split points segment by segment on desktop	Complete it once, no need to save page by page
Just a few pages	Select the page number and extract it as a new file	No changes to the original file
The document contains sensitive content such as contracts and medical records.	Processed locally on desktop	Files do not have to be uploaded to a third-party server
Only disassemble once, the file is small and insensitive	Split website or system online and print to PDF	No software to install, but be aware of privacy and restrictions

Before you start: Confirm these points first

Confirm whether the file can be opened directly. If the PDF has a password to open, you need to enter the password before it can be processed. This is a protection setting for the file itself, and you should obtain the password from the file provider rather than looking for a way around it.
Plan split points based on actual page numbers. The page number of the book is often inconsistent with the page number of the document because the cover and table of contents take up pages. Before splitting, flip through it in the reader and write down the starting and ending pages of the chapters.
Determine whether it is a scanned copy. Try to select a piece of text with the mouse: if you can select it, it means it is a text version; you can only select the entire picture, which is mostly a scanned copy. The operation of splitting the scanned document is the same, but if you need to retrieve the text later, you will also need to use OCR processing.
Think about the naming rules for the output in advance. Splitting will produce multiple files, named like "Chapter 1-5" and "Attachment A", which will be easier to find later.
Keep originals. Put the split result into a new folder without overwriting the original file, and you can start over if you make an error.

Steps to split PDF by page number in OmniDoc desktop

Go to download.omnidoc.top to download and install the desktop client, which supports Windows, macOS and Linux.
Open the PDF you want to split, and first confirm the total number of pages and target page number in the reading interface.
Enter the PDF editor and find the page operation related functions. It includes insertion, deletion, rotation, rearrangement, merge and split.
Select the split function and set the split point where it needs to be disconnected, for example, split between pages 5 and 6 to form two sections, pages 1 to 5 and pages 6 to 12.
Select the output location. It is recommended to create a new folder to avoid overwriting the original file.
Confirm execution and wait for the result file to be generated.
Open the output files one by one and check the number of pages and content.
After confirming that it is correct, rename it according to the naming rules and then use it for sharing or archiving.

Other common methods: online splitting and system built-in functions

When you don’t want to install software, you can use the online splitting website in your browser. The process is usually uploading files, setting page numbers, and downloading results. The risk of this type of website is that the files have to be uploaded to someone else's server, the file size and number of pages may be limited, and watermarks or advertisements may appear in the results. Before using it, check to see if it explains how long the files will be saved and how to delete them. Do not upload sensitive files.

On most computers, you can also use the system's built-in printing function: select the output method of saving as PDF in the print dialog box, and only set the required page number range to get a new PDF. This method is suitable for breaking out a small number of pages. But it will regenerate the file, and bookmarks, hyperlinks and forms may be lost. Please check carefully after uninstalling.

Check each item after completion

Check items	How to see	What to do if there is a problem
Number of pages	Compare the starting and ending pages of the original article section, and add up the number of pages in each paragraph to see if it is equal to the target number of pages.	If the page number is miscalculated, split it again. Pay attention to whether the cover page and the table of contents page are included.
Page order and content	View the first and last pages of each file one by one	If the order is wrong, go back to the original parts and disassemble them again. Do not splice them by hand.
Text and pictures	Check a few pages to see if the charts, formulas, and tables are complete	If missing, check whether the original file is a scanned copy, and use the desktop method if necessary.
Bookmarks and hyperlinks	Check whether directory navigation and links can work properly	If the lost instructions are reprinted, use page splitting instead and split them again.
File name and location	Check naming rules and storage folders	Rename uniformly and put into archive folder

If you are splitting a scanned document and need to be able to search for text, you can first use the OCR function in the PDF editor to process it and then verify it. The recognition results of OCR require manual verification, especially numbers, names, and professional terms.

❓ Frequently Asked Questions (FAQ)

1. Will the PDF become blurry or layout disordered after being split?

Page splitting removes the original content page by page, usually without changing the clarity and layout. If it is regenerated by printing, the font and layout may have changed. You should check a few pages after splitting.

2. Can the split files be merged again?

Can. The page operation on the desktop side includes a merge function, which can recombine the separated files into a PDF.

3. Can a PDF be split into multiple files?

able. Just set multiple split points as needed. The more pages there are, the more important it is to plan the naming before outputting to avoid confusion.

4. How should I choose to split PDF for free?

Look at three points when choosing: file size and page limits, whether to add watermarks, and whether to explain privacy and file deletion methods. After splitting, check whether the layout is retained. This step cannot be omitted.

📝 Summary

The key to splitting a PDF is to first clarify the page number and purpose, and then choose a method. For sensitive or batch files, it is preferred to use desktop page splitting. Only online tools or printing methods should be considered when dealing with small files occasionally. After disassembling, check the number of pages, content and file names one by one to avoid subsequent rework.

Open OmniDoc and use the PDF editor to work with your document