Instant Bookmark Detection
All top-level and nested bookmarks are detected the moment you upload.
Split PDF by Bookmarks
Automatically divide any PDF into separate files at every bookmark. No software. No sign-up. Results in seconds.
Why Split a PDF by Its Bookmarks?
Bookmarks in a PDF act as a built-in table of contents, marking where each chapter, section, or topic begins.
When you split a PDF at its bookmarks, each resulting file maps exactly to one logical section - making it far easier to share individual chapters, distribute sections to different teams, or archive content by topic.
Instead of manually counting pages and guessing ranges, let the bookmark structure do all the work. iMZi PDF reads every bookmark in your document and splits at precisely the right page.
How to Split a PDF by Bookmarks
Three simple steps are all it takes to break your PDF apart at its bookmarks.
1. Upload Your PDF
Open the Split PDF by Bookmarks tool and upload your file. The tool instantly detects all bookmarks.
2. Review Detected Bookmarks
A list of every bookmark appears. Optionally filter by bookmark text to split only matching sections.
3. Split & Download
Click Split PDF. Each bookmarked section is saved as its own file, ready to download as a ZIP.
Why iMZi PDF for Bookmark-Based Splitting?
Precise, automated, and completely free - no other tool matches the speed.
Filter by Bookmark Text
Only split sections whose bookmark names contain a specific keyword.
Preserves Formatting
Fonts, images, links, and annotations carry over to each split file intact.
No Account Needed
Free to use without registration or any subscription.
Secure & Private
Files are encrypted in transit and deleted automatically after processing.
Works on Every Device
Browser-based - works on Windows, Mac, iOS, and Android.
Turn One PDF into Many - Instantly
Whether your document has 5 bookmarks or 500, iMZi PDF processes them all in a single pass and packages the results into a downloadable ZIP file.
Common Uses for Bookmark-Based PDF Splitting
Any structured PDF benefits from being divided along its bookmark outline.
Distribute individual report chapters
Share specific manual sections
Archive legal documents by clause
Extract course modules from e-books
Send only relevant sections to clients
Organize research papers by topic
Frequently Asked Questions
Find answers to common questions about this tool.
Split Your PDF at Every Bookmark - Free
Upload your PDF, let iMZi detect the bookmarks, and download neatly separated files in seconds.