Why and How to Split PDF Pages in Half

Some PDFs put two pages on one sheet. A scanned book shows the left and right pages side by side, a printout has two slides on each page, or a landscape sheet holds two forms that were meant to be printed separately. On a large monitor you can live with that. On a phone, an e-reader or a printer it gets in the way.

Splitting each page fixes it: one sheet becomes two or more pages, in reading order, in a new PDF. This guide covers when that is worth doing, how to choose between a vertical and a horizontal cut, how to cut a page into three, four or five pieces or into a grid, and how to do it online, in Adobe Acrobat, on a Mac or from the command line. At the end are the questions people ask most, with answers.

What "split a page in half" means

In most PDF tools, "split" means breaking a document into several files, for example pages 1 to 10 in one file and pages 11 to 20 in another. The pages themselves stay as they are. If that is what you need, use Split PDF.

Splitting a page in half is a different job. The tool cuts through the page itself and keeps every part, so a document of 40 two-up sheets becomes a document of 80 single pages. That is what Split PDF Pages in Half does.

When you need it

• Scanned books and magazines. A flatbed scan of an open book puts two pages on every sheet. The guide to splitting scanned book pages covers covers, off-centre scans and tidying up.
• Landscape sheets with two portrait pages. A landscape A3 sheet cut down the middle gives two A4 pages. The same works for A4 into two A5 pages, and for tabloid (11 x 17 inches) into two US Letter pages.
• Two-up and four-up printouts. Lecture notes and slide handouts are often saved with two, four or six slides per page. Cutting them apart lets you read or print one slide at a time.
• Stacked layouts. Two or three forms, receipts or tickets printed one above the other can be separated into their own pages.
• Brochures and panels. A tri-fold leaflet has three panels side by side; each can become a page.
• One very long page. A long receipt, a web page saved as a single tall page or a scroll-style document can be cut into several normal pages.

Why it is worth doing

• Easier reading on small screens. One page per screen means bigger text and no sideways scrolling on a phone or e-reader.
• Better printing. Each page prints on its own sheet at full size instead of as two shrunken halves.
• Correct page numbers. Page 12 of the book becomes page 12 of the PDF, so references and page numbers you add line up.
• Sharing just one page. Once every page stands alone, you can extract or delete pages without taking its neighbour with it.
• Cleaner text recognition. Text recognition tends to cope better with one column of text per page than with two pages and a dark gutter in between.

Vertical or horizontal: which cut do you need?

Choose by looking at where the parts sit on the page. Tools do not agree on the names, so it helps to think about the line rather than the word.

• Vertical cut: the line runs from top to bottom and you get a left part and a right part. Use it when the content sits side by side, such as an open book, a magazine spread, a landscape sheet holding two portrait pages or the panels of a brochure.
• Horizontal cut: the line runs from left to right and you get a top part and a bottom part. Use it when the content is stacked, such as two forms on one portrait page, tickets printed one above the other or a long scrolling page.

If the parts are not exactly equal, as with a book that was not centred on the scanner glass, move the line to the gap between them instead of cutting at 50%.

How to split PDF pages in half with PilotPDF

1. Open Split PDF Pages in Half and choose your PDF. One file at a time, up to 500 MB. Nothing needs to be installed.
2. Choose Vertical or Horizontal. Pick the direction that matches the layout, as described above.
3. Set Parts per Page. Two is the usual choice. You can choose up to five, as described in the next section.
4. Check the lines in the preview. They start evenly spaced. Drag any line to the gutter or the gap between sections if the content is not centred.
5. Choose the pages. Split every page, or only some of them. Pages you leave out, such as a cover that is already a single page, are copied into the new file unchanged.
6. Download the new PDF. Each part becomes its own page in reading order: left to right for a vertical cut, top to bottom for a horizontal one.

The pages are not turned into pictures. The original page content is kept and only the visible area of each new page changes, so text stays selectable and images keep their resolution.

Splitting a page into three, four or five pieces

"In half" is the common case, but the tool can cut each page into up to five parts in one go. Raise Parts per Page and extra lines appear, evenly spaced: at a third and two thirds for three parts, at each quarter for four, and so on. Every line can be dragged on its own, so the parts do not have to be the same size.

• Vertically into columns: a tri-fold brochure becomes three pages, or a wide panorama of four slides becomes four.
• Horizontally into rows: three receipts on one page become three pages, or a long scrolling page becomes five normal-height pages.

If one sheet needs more than five pieces in the same direction, split it into five first, then open the result and split the pieces that are still too big.

Splitting both ways: quarters and grids

One pass cuts in one direction. To cut a page both horizontally and vertically, for example a four-up handout or a sheet of labels, run the tool twice on the same file.

1. First pass, horizontal: choose Horizontal and the number of rows. A four-up handout has two rows; a sheet of six labels in three rows has three.
2. Second pass, vertical: open the PDF you just downloaded, choose Vertical and the number of columns, and split every page again.

Doing the rows first matters. The first pass gives you each row as a page, and the second pass cuts each row from left to right, so the final pages come out row by row, the way people read: top left, top right, then the next row. Cut the columns first and you get every page of the left column before the right one, which you would then have to fix with Rearrange PDF Pages. With up to five parts in each pass, you can cut a sheet into a grid of up to 25 pieces.

Other ways to do it

In Adobe Acrobat

Acrobat's Split command divides a document into separate files by number of pages, file size or bookmarks. It does not cut one page into two. The usual workaround in Acrobat Pro is to duplicate every page so each sheet appears twice in a row, then use Crop Pages to keep the left half on one copy and the right half on the other. It works, but it takes a while, and the free Acrobat Reader cannot do it.

In Preview on a Mac

Preview has no single command that cuts one page into two. You can duplicate pages and crop each copy by hand, which is fine for two or three pages and slow for a whole book. On a Mac it is usually quicker to open the online tool and do every page at once.

From the command line on Linux

On Linux, including Ubuntu, MuPDF's mutool poster -x 2 cuts every page with a vertical line and -y 2 cuts it horizontally, without turning the pages into images. Using both options together cuts each page into a grid. ImageMagick can crop pages too, but it converts each page to a picture first, so the text can no longer be selected or searched and the file often gets bigger.

After the split

• Booklets come out of order. A folded booklet prints page 8 next to page 1 on the same sheet, so cutting it gives the right pages in the wrong order. Put them back in order with Rearrange PDF Pages.
• Right-to-left books need a swap. The left part always comes first, which is wrong for Arabic, Hebrew and Japanese books. Rearrange PDF Pages fixes that too.
• Scans often need trimming. Dark scanner edges and uneven margins can be removed with Crop PDF.
• Big files can be made smaller. Scanned pages are pictures, so Compress PDF often helps before you send the file.
• Scans can be made searchable. PDF OCR adds a text layer so you can search and copy text from the pages.
• Private details need redacting, not cutting. The part outside each new page is hidden, not deleted. To remove names, numbers or images for good, use Redact PDF.

Why use PilotPDF for this

The PDFs people split are often private: a scanned contract, a textbook, a form with personal details, a set of tickets. PilotPDF does not keep a copy of your PDF or of the split result, and it does not keep passwords or document contents after the job is done. Many online PDF services handle files on their own servers and keep them for a while before deleting them; you can compare two of them in PilotPDF vs iLovePDF and PilotPDF vs Smallpdf.

It is also simply easier. There is no account to create, no email address to give, no watermark on the result and nothing to install, and it works the same on Windows, macOS, Linux, iPhone and Android. The file privacy questions page and the privacy policy explain the details.

Questions people ask

These come from forums such as Reddit, Adobe Community and Super User, and from what people type into search engines.

Ready to try it? Open Split PDF Pages in Half, choose your file and check the cut in the preview before you download.