How to Split a PDF Into Multiple Files

You have one big PDF and need only part of it, or you need every page as its own file. This guide walks through the two split modes, the exact range format the tool accepts, and the file names you get back, so the first split is the right one.

Split a PDF in four steps

The Split PDF tool has two modes: one cut-out range, or one file per page. Both start the same way.

1. Drop your PDF on the box, or click Select PDF File. The tool takes one file at a time.
2. Wait for the status line to read "Loaded N pages. Choose your split options below." The file list also shows the page count next to the file size.
3. Open the Split mode menu. Choose Extract a page range and type something like 5-10 in the page range box, or choose Split every page into a separate PDF (ZIP).
4. Click Split PDF, then Download in the green result box.

Pick the mode by what you need to hand over

The two modes produce very different downloads, so decide before you click.

If the PDF has only one page, the "every page" mode skips the ZIP and gives you a single page-1.pdf, with the result line saying "This PDF has only one page".

How the page range box reads what you type

The range box is stricter than it looks, and this is where most failed splits come from. The code accepts exactly two shapes: a single page number such as 7, or two numbers joined by a hyphen such as 5-10. Pages are counted from 1, and the placeholder changes to 1-N once your file loads, where N is its page count.

• 5-10 gives pages 5 to 10 in one file. The summary reads "Extracted 6 page(s)".
• 7 gives page 7 alone.
• An empty box means every page, so you get a full copy of the document, which is rarely what you want.
• 10-5, 0-3 or an end number past the last page all fail with "Could not split this PDF. Please check your page range and try again."

Commas are the trap. The tool does not support lists like 1-3, 8, and it does not reject them either. The text after a comma is simply ignored, so 1-3, 8 is read as 1-3, and 2,5 is read as page 2. Always check the page count in the result line against what you expected. For scattered pages, use Extract Pages, where you click thumbnails instead; the extract guide covers that approach.

Cutting a document into several chapters

The range mode produces one range per run, but the file stays loaded afterwards. For a 60-page report with chapters at pages 1 to 18, 19 to 40 and 41 to 60, you can work through it like this:

1. Type 1-18, click Split PDF, click Download. Rename the saved split.pdf to something meaningful straight away.
2. Change the box to 19-40 and repeat. Each download is called split.pdf again, and your browser may add a number or overwrite, depending on its settings.
3. Finish with 41-60.

Renaming between runs matters more than it sounds. Three files named split.pdf, split (1).pdf and split (2).pdf are easy to mix up. If you need many chapters, the other route is to split every page into the ZIP and then join the page files you want with Merge PDF, though for three or four chapters repeated range runs are quicker.

What the pieces contain, and what they do not

The tool uses the pdf-lib library to create a new, empty PDF and copy the chosen page objects into it. Nothing is redrawn or flattened, so text stays selectable and images keep their original pixels. There is no quality loss from splitting.

Two consequences are worth planning for:

• The parts do not add up to the original size. Pages that share a font or a logo each carry their own copy once they are in separate files, so 20 single-page files can together weigh more than the source. If size is the goal, run Compress PDF on the pieces afterwards; the guide on PDFs that are too large to email has more.
• Document details start fresh. Because each piece is a newly created document, do not assume the title, author or bookmarks come across. Check the file in your viewer, and use the PDF Metadata Editor if you need them set.

Your original file is left alone. Every split is a separate download.

When the split fails or the output looks wrong

• The page count is higher than you expected. A scan from a duplex scanner often includes blank backs. Look at the file first in View PDF, whose Prev and Next buttons step through one page at a time, and note the real page numbers.
• Nothing happens after you drop the file. The tool only accepts files that the browser reports as application/pdf. A renamed document or an image is ignored without a message.
• The file is password protected. The tool never asks for a password. Make an unprotected copy first with Unlock PDF, if you are entitled to open it.
• A big file is slow in "every page" mode. Each page is saved as its own document and then zipped, and the progress bar fills page by page. A long file uses more memory on your device, and the tool sets no page limit of its own.
• The ZIP will not open on a phone. Some phones show ZIPs as a single opaque file. Open it on a computer, or use ZIP Extractor to look inside.

When splitting is the wrong move

Splitting keeps pages and throws nothing away. If the real goal is different, another tool is a better start:

• You want the document without a few pages: delete those pages and keep one file.
• The pages you need are not next to each other: use Extract Pages.
• The pieces must go back together in a new order: split, then merge them, or reorder directly with drag and drop.
• You are planning the whole job: the PDF page management guide shows which operation to run first.

Frequently Asked Questions

Can I split a PDF into several files at once?

Only in the every-page mode, which gives one PDF per page inside a ZIP. For chapters, run the page range mode once per chapter. The file stays loaded, so you only change the range and click Split PDF again.

What do the downloaded files get called?

A page range is saved as split.pdf. The every-page mode saves split-pages.zip, containing page-1.pdf, page-2.pdf and so on. Rename each download straight away, because repeated range runs all use the same name.

Why did I get fewer pages than the range I typed?

Check for a comma. The range box reads only a single number or a start-end pair, and anything after a comma is ignored, so 1-3, 8 is treated as 1-3. The result line states how many pages were extracted, so compare it with your plan.

Can I split by file size, such as into 5 MB parts?

No. The tool splits only by page range or by every page. To reach a size target, split by page ranges that you judge to be about the right size, then check the sizes shown in the result line.

Does splitting need an internet connection?

The tool page fetches the pdf-lib and JSZip libraries from cdnjs when it loads. After that the script reads your PDF in the browser and has no upload step, so the pieces are created on your device.

Will the split pages keep their text and links?

The pages are copied as they are, not redrawn, so text stays selectable and images keep their pixels. Document-level extras such as title, author and bookmarks are not guaranteed, so check the result if you rely on them.