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Merge & Organize

Split PDF Pages in Half

Split PDF pages in half when each page holds two: a scanned open book, an A3 spread, a two-up printout. Every page is cut down the middle into single pages, in reading order.

Split PDF Pages in Half

Settings appear once you add a PDF.

Cut
Advanced 3
Leave the first page whole (a cover)
Leave the last page whole (a back cover)
Right page first (Arabic, Hebrew, manga)

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  • 100% private Your PDFs never leave this device. Everything runs in your browser.
  • No limits No file-size cap, no watermark, no sign-up and no daily quota. Free.
  • Batch ready Add as many PDFs as you like; each one is handled and saved in one go.

How to split PDF pages in half

  1. Add your PDF: Drop the PDF of spreads — a scanned book, an A3 document.

  2. Check the settings: Choose to cut down the middle or across it, and whether the covers stay whole.

  3. Save the result: Save. Each spread becomes two pages, in reading order. Nothing is re-scanned: the cut is exact.

Why it doesn’t upload

Scanned books and bound documents are big files, and often private ones — notebooks, manuscripts, records. Cutting them in your browser avoids a long upload and keeps them yours.

Check it in your browser’s Network tab

Worth knowing

  • The cut is exactly in the middle. Spreads scanned off-center may clip a letter or two at the gutter — crop them first if needed.
  • Text stays selectable; the cut only changes the visible area of each page.
  • Pages are counted as displayed, so rotated scans are cut the way you see them.

Under the hood

What happens to your file

Every page is placed twice onto new pages, each showing one half — down the middle for book spreads, or across it — with the halves in reading order (right to left for right-to-left books). The page content is embedded, not rasterized, so text stays text.

Runs on pdf-lib

Reference: pdf-lib documentation

Why split PDF pages down the middle?

A scanned open book, an A3 spread or a two-up printout puts two pages on every sheet. Reading that on a phone means zooming and panning constantly. Cutting each page down the middle turns it back into single pages in reading order, which reads naturally and prints at a normal size.

The cut changes what each page shows rather than redrawing it, so text stays selectable and image quality is untouched — and the book never leaves your device.

Common uses for cutting PDF pages in half

  • Scanned books

    Split two-page book scans into single pages for reading on a tablet or phone.

  • A3 to A4

    Turn A3 spreads or drawings into two A4 pages for an ordinary printer.

  • Two-up printouts

    Undo a document that was printed or exported two pages per sheet.

  • Comics and manga

    Split spreads, with a right-to-left option for manga and Arabic or Hebrew books.

  • Booklets

    Separate a scanned booklet’s pages while keeping the cover whole.

Tips for splitting scanned book pages

  1. Keep the cover as one page with Leave the first page whole.
  2. Use Right page first for books read right to left.
  3. Spreads scanned off-center can clip a letter at the gutter — crop them first if the margin is uneven.
  4. Choose Across the middle for pages stacked top and bottom instead of side by side.
  5. Rotated scans are cut the way you see them, so fix orientation first if the result looks wrong.

Questions

How do I split a scanned book PDF into single pages?

Drop it here, keep Down the middle and press Split pages in half. Each two-page spread becomes two pages, left then right.

How do I split an A3 PDF into A4 pages?

An A3 page is two A4 pages side by side (landscape) or stacked (portrait). Cut down or across the middle accordingly and you get A4-sized pages.

Can I keep the cover as one page?

Yes — switch on Leave the first page whole. Same for a back cover.

Does it work for right-to-left books?

Yes — under Advanced, choose right page first.

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