How to split a PDF
Four reliable ways to split a PDF into multiple files or pull out a few pages, whichever device is in front of you, and what actually happens inside the file when you do.
1. In any browser, with SplitPDF
- Open splitpdf.io and choose your PDF. It opens locally; nothing is uploaded.
- Pick a method: custom ranges (1-5, 6-12), every N pages, bookmarks, file size, or extract a selection.
- Check the colour-coded previews, press Split PDF, and save the files or the ZIP.
Best when you need several parts at once, split by chapter or size, or you're on a borrowed computer where you can't install anything.
2. On a Mac, with Preview
- Open the PDF in Preview and choose View → Thumbnails.
- Select the pages for the first part (⌘-click for several).
- Drag them onto the desktop. Preview creates a new PDF with just those pages. Repeat per part.
Lossless and built in, but one part at a time and no splitting by size or bookmarks.
3. On Windows, with print to PDF
- Open the PDF in Edge or Chrome and press Ctrl + P.
- Set the printer to Microsoft Print to PDF (or Save as PDF) and type a range under Pages, e.g. 3-8.
- Save. Repeat for each range.
Works everywhere, but printing re-draws the pages: internal links, bookmarks and fillable fields are lost and the file may grow.
4. In Adobe Acrobat
Acrobat's Organize Pages → Split splits by number of pages, file size or top-level bookmarks. It's thorough, but the split feature needs a paid Acrobat subscription, and Adobe's free online version uploads your document to Adobe's servers.
Which method for which job
| Job | SplitPDF | Mac Preview | Print to PDF |
|---|---|---|---|
| Several parts in one go | Yes | One at a time | One at a time |
| By chapter bookmarks | Yes | No | No |
| Under a size limit | Yes | No | No |
| Keeps text selectable and links | Yes | Yes | Text yes, links often no |
| Nothing uploaded | Yes | Yes | Yes |
What splitting does inside a PDF
A PDF is not one long picture. It's a collection of numbered objects: each page is an object that points to its content (the drawing instructions), and to shared resources such as fonts and images. A proper splitter doesn't redraw anything; it creates a new, empty PDF and copies the page objects across, following every pointer so each part gets the fonts and images its pages need.
That's why a good split is lossless, and also why the parts together usually weigh more than the original: a font used on every page lives once in the original but has to travel with each part.
Why the parts weigh more than the whole
A model 12-page report: 60 KB of text per page, plus one embedded font and one logo image used on every page. Change the numbers and the split count.
All parts together: 2670 KB, which is 95% more than the original. The gold segment is copied into every file, because each PDF must carry the fonts and images its own pages use.
Real files vary: fonts are often subset (only the characters used), and pdf-lib copies a resource only if the part's pages reference it. But the direction is always the same: splitting never makes the total smaller.
The same logic explains two other surprises: removing pages often shrinks a file less than expected (the fonts stay because other pages still use them), while splitting off a photo-heavy appendix can shrink the rest dramatically.
Knowing what sits inside the file turns a puzzling size jump into common sense. Plenty of everyday puzzles give way once you see the mechanism; for one far from paperwork, ahaboo narrates why the Moon has phases.
Questions about splitting PDFs
How do I split a PDF without Adobe Acrobat?
Use a browser tool that works locally, like SplitPDF, or the free apps already on your computer: Preview on a Mac, or "Microsoft Print to PDF" on Windows for one range at a time.
How do I split a PDF on a Mac?
In Preview, open the sidebar (View → Thumbnails), select the pages you want and drag them to the desktop; Preview saves them as a new PDF. Repeat for each part.
How do I split a PDF on Windows?
Open the PDF in Edge or Chrome, press Ctrl+P, choose "Microsoft Print to PDF" or "Save as PDF", enter a page range under Pages and save. Note that printing re-renders the pages and can drop links and form fields.
How do I split a PDF on iPhone?
Open this page in Safari and use the splitter, or in the Files app open the PDF, show thumbnails, select pages and use Share → Save to Files. SplitPDF is quicker for multiple parts.
Is it safe to split confidential PDFs online?
Only if the tool doesn't upload them. Many online splitters send the file to their server. SplitPDF processes the file in your browser; you can confirm this by disconnecting from the internet after the page loads.