No Technical Knowledge Needed
If you can upload a file and click a button, you can split a PDF by bookmarks.
How to Split a PDF by Bookmarks
A clear, step-by-step walkthrough for dividing any PDF into separate files at its bookmark boundaries - no software required.
What You Need Before You Start
Splitting a PDF by bookmarks requires a PDF file that already contains bookmarks (an outline).
Open your PDF in any PDF reader and check whether the sidebar shows a bookmarks or outline panel. If it does, your file is ready. If not, you may need to add bookmarks first using a PDF editor.
Once confirmed, the entire split process on iMZi PDF takes under 60 seconds regardless of document length.
Step-by-Step: How to Split a PDF by Bookmarks
Follow these exact steps to split your PDF at its bookmarks using iMZi PDF.
Step 1 - Open the Tool
Go to iMZi PDF and navigate to the Split PDF by Bookmarks tool. The page loads with a drop zone for your file.
Step 2 - Upload Your PDF
Click the upload area or drag your PDF onto it. The tool immediately reads the bookmark tree and lists every bookmark it finds.
Step 3 - Filter Bookmarks (Optional)
If you only want to split at specific bookmarks, type a keyword in the "Contains text" filter. Only bookmarks whose names include that text become split points.
Step 4 - Click "Split PDF"
Press the red Split PDF button. Processing happens server-side within seconds, even for large files.
Step 5 - Download Your Files
A ZIP file containing one PDF per bookmarked section downloads automatically. Each file is named after its bookmark title.
Why This Is the Easiest Method
iMZi PDF removes every friction point from the bookmark-splitting workflow.
Guided Interface
The tool displays every detected bookmark so you always know what will be split.
Optional Keyword Filtering
Narrow down which sections to extract using a simple text filter.
Instant Results
Most PDFs are split and ready to download in under 10 seconds.
No Account Required
You are never asked to sign in or create a profile.
Safe & Deleted After Use
Files are removed from servers automatically once you download.
Troubleshooting: What If No Bookmarks Are Detected?
If the tool shows no bookmarks, your PDF was created without an outline. Some scanners and print-to-PDF drivers omit bookmarks entirely. In this case, use iMZi's Split by Page Range tool to manually define your split points, or add bookmarks with a PDF editor first.
Popular Bookmark Splitting Scenarios
These are the most common reasons users follow this guide.
Splitting a downloaded e-book by chapter
Extracting a single report section to email
Dividing a combined manual for different teams
Separating academic paper appendices
Breaking apart a large policy document
Distributing event programme sections
Frequently Asked Questions
Find answers to common questions about this tool.
Ready to Split Your PDF by Bookmarks?
Follow the steps above with your own PDF - it takes less than a minute.