# Split PDF by Bookmarks, File Size, Text or Blank Pages

> Split a PDF by bookmarks, maximum file size, every N pages, odd/even pages, blank separator pages or a keyword/regex. Preview the parts, download a ZIP.

- URL: https://qilingtools.com/en/pdf/split-advanced
- Category: PDF Tools (https://qilingtools.com/en/pdf)
- Tags: [PDF](https://qilingtools.com/en/tags/pdf), [Merge & Split](https://qilingtools.com/en/tags/split-merge)
- Last updated: 2026-10-26
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

Basic splitters only cut by page ranges, but real documents often need smarter rules. This tool offers six. By bookmarks: one file per chapter named after the bookmark title, using only top-level bookmarks or deeper levels, with the relevant bookmarks kept inside each file. By file size: set a maximum in MB and the tool actually saves each part to measure it, packing as many pages as fit, which is ideal for email attachments and upload limits. Every N pages: fixed-size chunks. Odd/even pages: one file of odd pages and one of even pages, handy for double-sided scans. Blank separator pages: when batch scanning with a blank sheet between documents, the file is cut at every blank sheet and the sheets are dropped. Text match: a new file starts at every page containing a keyword such as “Invoice No.” or “Chapter” (regular expressions supported), named after the line that matched. Except for the size and blank-page modes, you see the plan first (file names, pages and counts), then download everything as a numbered ZIP. Everything runs locally in your browser.

## How to use

1. Upload the PDF you want to split
2. Choose a split mode (bookmarks, file size, every N pages, odd/even, blank pages or text match), set its options and review the planned files
3. Click Split & download; multiple files are bundled into a ZIP

## Features

- Split by bookmarks with chapter titles as file names
- Choose the bookmark level and keep bookmarks in each part
- Split by maximum MB, measured by real saves
- Every N pages and odd/even page splits
- Split batch scans at blank separator pages
- Start new files at keyword or regex matches
- Plan preview and numbered ZIP download
- Processed locally, never uploaded

## FAQ

### Why does splitting by size create more parts than expected?

Each part has to carry its own copy of shared resources such as fonts and images, so the parts add up to more than the original. The tool saves every part to measure its real size so none exceeds the limit; a single page that is larger than the limit on its own becomes its own file, marked “oversize”.

### Can I split by chapter if the PDF has no bookmarks?

Splitting by bookmarks needs the PDF to have an outline. If it doesn’t, add bookmarks with our bookmark editor first, or use Text match with a pattern such as “Chapter \d+” to cut at each chapter heading.

### How are blank separator pages detected?

Each page is rendered at low resolution and the share of dark pixels (ignoring the outer 5%) is measured; pages below the threshold with no text at all count as blank. Blank sheets in scans often have specks, so raise the threshold slightly if some are missed.

### Are my files uploaded?

No. Reading, detection and creating the new PDFs all happen in your browser, so it is safe for contracts, invoices and other sensitive files.

## Related tools

- [Merge PDF](https://qilingtools.com/en/pdf/merge): Free online PDF merger: combine several PDF files into one in the order you choose, with reordering. Processed locally in your browser, no upload, no sign-up.
- [Split / Extract PDF](https://qilingtools.com/en/pdf/split): Free online PDF splitter: extract a page range into a new PDF, or split every page into its own file and download them as a ZIP. Processed locally.
- [Rotate PDF](https://qilingtools.com/en/pdf/rotate): Free online PDF rotator: rotate all or selected pages by 90°, 180° or 270° to fix scanned documents. Processed locally, no upload.
- [PDF to Image](https://qilingtools.com/en/pdf/to-image): Free online PDF to image converter: render every page as a high-resolution JPG or PNG at 72/150/300 DPI, download all as a ZIP. Processed locally, no upload.
- [Image to PDF](https://qilingtools.com/en/pdf/from-image): Free online image to PDF converter: combine JPG, PNG and WebP images into one PDF in order, with A4 or image-sized pages. Processed locally, no upload.
- [Compress PDF](https://qilingtools.com/en/pdf/compress): Free online PDF compressor: re-render pages with compressed images to shrink scanned and image-heavy PDFs, with adjustable quality. Processed locally.
- [Watermark PDF](https://qilingtools.com/en/pdf/watermark): Free online PDF watermark tool: add text watermarks to every page, tiled or centred, with opacity and angle controls. Any language, processed locally.
- [Delete PDF Pages](https://qilingtools.com/en/pdf/delete): Free online tool to delete PDF pages: remove pages by number or range and keep the rest, then download. Processed locally, no upload.