Insert Blank Pages into PDF
Insert a blank page every N pages, with optional pad-to-even mode
About this tool
Insert Blank Pages into PDF inserts an empty page after every Nth page in a PDF (e.g. after each chapter end), with an optional 'pad to even' mode that appends one trailing blank page if the final count is odd. This is the standard preparation step for duplex (double-sided) printing where a one-sided chapter must start on a fresh sheet of paper. Common scenarios include preparing booklets for print, avoiding back-of-page bleed-through in legal documents, and ensuring each section in a report starts on a right-hand page. All processing happens locally in your browser using pdf-lib. Maximum file size is 50 MB.
Frequently Asked Questions
What does 'pad to even' do exactly?
If the final page count is odd, one blank page is appended so the total is even. This prevents the next document in a printer queue from printing on the back of your last page.
Where are the blank pages inserted?
After every Nth original page. With N=2 and a 6-page source, blanks are inserted after pages 2 and 4. The last position is skipped if it would just be a trailing blank (handled by 'pad to even' instead).
Are blank pages the same size as the source?
Yes. Each blank page matches the dimensions of the page immediately before it.
Is my PDF uploaded to any server?
No. Everything is processed locally in your browser using pdf-lib. The file never leaves your device.
What is the file size limit?
50 MB. The limit is set client-side and depends on browser memory.
Why do I need this for duplex printing?
Duplex printers print on both sides. If a chapter ends on an odd page and you want the next chapter to start on a new sheet, insert a blank to push it forward.
When is this most useful?
Duplex printing prep, booklet binding, ensuring section starts on right-hand pages, legal document formatting.
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