Split by Bookmarks tool intelligently splits your PDF based on its bookmark or chapter structure. Each bookmark section becomes a separate PDF file, making it ideal for organizing large documents with clear chapter divisions. The tool automatically detects all bookmarks in your PDF and allows you to choose which bookmark level to split at. You can split at top-level chapters, subsections, or any bookmark level that suits your needs. This is perfect for breaking down large technical manuals, academic textbooks, legal documents, or any PDF with a clear hierarchical structure. The splitting process preserves all formatting, images, and text quality in each resulting file. Each split file maintains the same quality standards as the original document, with bookmarks preserved within each file. Processing happens instantly in your browser, ensuring complete privacy and security. The resulting files can be downloaded individually or as a ZIP archive. Perfect for students organizing course materials, professionals managing large document sets, or anyone who needs to break down structured PDFs into manageable chapters.